Mounting Plates
Types of Mounting Plates

Flat and Ribbed Plates

These plates provide the most solid connection of your telescope to your mount. We recommend them for the most critical applications and larger telescopes. The ribbed mounting plates are thicker, yet much of the material is removed to provide strength without excess weight. Use these plates for the largest instruments.

Dovetail Plates and Sliding Bars
Dovetail plates add a new level of convenience and ease of use to our mounts and tube assemblies. These are a few of the handy applications:

  • Aid in re-balancing your scope after switching from featherweight orthoscopics to hefty 2 lb. eyepieces, binocular viewer or camera back
  • Quickly interchanging scopes when used as a mounting plate
  • Quickly interchanging accessories when used as an accessory plate

Although listed separately, the dovetail plates and sliding bars are used together (the exception is the 7" or 10" sliding bars when used as a stationary mounting plate). The narrow sliding bar moves within the channel of the dovetail plate until the desired position is achieved. Tightening the knobs of the dovetail plate secures the sliding bar.

The dovetail plates have a built-in safety feature to help prevent the sliding bar from slipping completely through the dovetail plate if the knobs are accidentally loosened. With our unique slot design, it is very easy to tilt the sliding bars into place, then lock down the knobs. This is much easier than trying to insert them into the slots from the end of the plate (very awkward when a scope is attached). Some of the dovetail plates can also be attached to the top of the rings to be used as an accessory plate.

Most of the sliding bars have multiple holes to allow a variety of items to be attached.

Mounting plates ordered from Astro-Physics come with screw packets to attach them to our mounts. For a listing of the required fasteners for a given application, please follow this link to our Fastener Chart PDF.

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15" Flat Mounting Plate (FP1500) - 400, 600E, Mach1GTO
This machined aluminum mounting plate measures 15" x 4.6" x 0.5". Two keyhole slots that measure 3.2" between centers are provided at each end of the plate. The distance between these pairs of holes is 13.75". You can drill additional holes to suit your needs. The plate weighs 3.3 lbs.
If you plan to use an accessory plate on top of your rings, we suggest the 15" Dovetail Plate (DOVE15). All Astro-Physics rings (exept the Traveler and Stowaway) are predrilled to accept the DOVE15. Rings from Parallax Instruments can also be drilled with the Astro-Physics hole pattern.
FP1500$85.00 in stockAdd FP1500 To My Cart
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18" Flat Mounting Plate (FP1800) - 900, 1200, Mach1GTO
This larger machined aluminum plate is available for the Mach1GTO, the 900 or 1200 mounts. It is 18" long and 7.5" at its widest point in the center. The width of the plate tapers to 5.5" at each end. Four pairs of keyhole slots that measure 3.2" between centers are provided. The two inner pairs are 13.75" apart and the outer two pairs are 17" apart. You can drill additional holes to suit your needs. The plate weighs 6.2 lbs.

If you use the innermost holes, you have the option of using the 15" Dovetail Plate (DOVE15) as an accessory plate on top of your Astro-Physics mounting rings. Rings from Parallax Instruments can also be drilled with the Astro-Physics hole pattern.

Please Note: While the 18" Flat Mounting Plate will fit on the Mach1GTO without a problem, you should carefully consider whether the mount is being overloaded. If your instrument is so big that it requires the FP1800, it is probably too big for the Mach1GTO.

FP1800$95.00 in stockAdd FP1800 To My Cart
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15" Ribbed Mounting Plate (900RP) - 900, Mach1GTO

Click here for an image of the ribbed underside
Our CNC machining center started with thick aluminum plate and carved out the excess material leaving a strong rib support structure. The finished plate is 0.75" thick, 15" long and 6.5" at its widest point.The width of the plate tapers to 4.75". A pair of keyhole slots that measure 3.2" between centers are provided at each end.The distance between these pairs of holes is 13.75". Due to the ribbed structure, you may not be able to drill additional holes to suit your mounting rings. The plate weighs 2.3 lbs.

Since the rings will be spaced 13.75" apart (center to center), you can use the 15" Dovetail Plate (DOVE15) as an accessory plate on top of your Astro-Physics mounting rings or Parallax Instruments rings with the Astro-Physics hole pattern.
900RP$145.00 in stockAdd 900RP To My Cart
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15" Ribbed Mounting Plate (1200RP15) - 1200
This plate is 14.75" long, 7.75" at its widest point 5" at each end and 1" thick. The underside of the plate is carved into a ribbed pattern to maximize the strength and minimize the weight to a mere 3 lbs. A pair of keyhole slots that measure 3.2" between centers are provided at each end. The distance between the pairs is 13.75".
Click here for an image of the ribbed underside
If you plan to use an accessory plate on top of your rings, we suggest the 15" Dovetail Plate (DOVE15). All Astro-Physics rings (except the Traveler and Stowaway) are predrilled to accept the DOVE15. Rings from Parallax Instruments can be drilled with the Astro-Physics hole pattern, as well.
1200RP15$210.00 in stockAdd 1200RP15 To My Cart
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24" Ribbed Plate (1200RP)- 1200

Click here for an image of the ribbed underside
For larger instruments, the ribbed structure of this plate provides the maximum support. Again, we start with thick aluminum plate and carve a strong rib structure. The final result is 1.5" thick, in the center, 24" long and 7.6" at its widest point. The width of the plate tapers to 5.5" at each end. A pair of keyhole slots that measure 3.2" between centers are provided at each end. The distance between these pairs of holes is 23". Due to the ribbed structure, you may not be able to drill additional holes to suit your mounting rings. The plate only weighs an amazing 9.5 lbs.

There is no corresponding accessory mounting plate available.
1200RP$295.00 in stockAdd 1200RP To My Cart
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8" Dovetail Plate (DOVE08) - 400, 600E, 900, Mach1GTO
This versatile plate is suited for the 105 f6 Traveler and 130 refractors (we prefer the 15" Dovetail Plate for most applications of the 130 f8 StarFire EDT) and other short instruments. The knob assembly features a brass pin with a tapered end to hold your sliding bar firmly without marring the aluminum. Use with the SB0800 or SB1000 sliding bars, which are sold separately. Repositioning the sliding bar will aid in adjusting the balance of your instrument.
These are some of the uses:
Mounting cradle plate -
  • 400 or 600E German equatorial mounts (all models) - attaches directly.
  • Mach1GTO or 900 mount (all models) - Use part # Q4047 to attach this plate.
  • All Takahashi mounts with the 2-hole mounting pattern (EM-10, EM-200, Teegul, etc)
    - use the Q4044 adapter plate.
  • GiroDX mount - use the Q4044 adapter plate.
  • Super Polaris - see DOVESP.

Accessory plate - Attach to the top of our Astro-Physics mounting rings (tube diameters 5"-8") or rings from Parallax Instruments that have the Astro-Physics hole pattern (you can request it). For the 105 f6 Traveler, use the Traveler Dovetail Accessory Plate. Note, you must also use a sliding bar on the bottom of the rings with the same distance (6.3" from center to center), i.e. the SB0800, SB1000 or a Vixen Super Polaris mount.

DOVE08$85.00 in stockAdd DOVE08 To My Cart
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8" Dovetail Plate for Super Polaris Mount (DOVESP)
The DOVESP is the same as the DOVE08 plate above with the addition of two adapter blocks, which allow it to be used on the Vixen Super Polaris Mounts (cannot be used with versions that already have a dovetail plate). Use with either the 7" Sliding Bar (SB0800) or 10" Sliding Bar (SB1000)
DOVESP$115.00 in stockAdd DOVESP To My Cart
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Traveler Dovetail Accessory Plate (ACPLTR)
Mount this accessory plate atop your Traveler to enable you to use the Straight-through Finders (850STI) with our Quick Release Bracket (850QRB) (please note that the Quick Release Brackets shipped prior to June 1994 cannot be used in this manner), 3.4" Guidescope Rings (no longer available), Piggyback Camera Bracket (PGBCNB) and TeleVue Starbeam or TeleVue Qwik-Point Finder. The plate measures 2.75"x7" and weighs only 8 oz. Use with 7" Sliding Bar (SB0800) or 10" Sliding Bar (SB1000).
Please note that the Traveler mounting rings must be 6.3" apart (center to center) to accommodate this plate. If your scope is mounted in any of the following configurations, the correct spacing will be achieved: any mount with an 8" Dovetail Plate (DOVE08), Vixen DX mount, Celestron (Vixen) Super Polaris or Great Polaris mounts, TeleVue Gibraltar mount with our 7" Sliding Bar (SB0800) as a mounting plate, very heavy-duty camera tripod with 7" Sliding Bar (SB0800) as a mounting plate. To see photos of the Traveler Accessory Plate with a wide variety of accessories, go to our Traveler photo page.
ACPLTR$85.00 in stockAdd ACPLTR To My Cart
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7" Sliding Bar (SB0800)

These are a few of the possible uses:

Attach to the bottom of mounting rings or cradle

Traveler, 130 StarFire f8.35 EDT or f6 EDFS, TeleVue and Takahashi refractors or any instrument that has 1/4-20 center holes in the mounting rings. Use with 8" Dovetail Plate (DOVE08) or 8" Dovetail Plate for Super Polaris (DOVESP).
Attach accessories

Use with 8" Dovetail Plate (DOVE08), 8" Dovetail Plate for Super Polaris (DOVESP) and Traveler Dovetail Accessory Plate (ACPLTR).

Use as a mounting plate or spacer bar

Attach to the rings of the Traveler, 92mm f5 Stowaway or 92mm f7 Stowaway. The bar functions as stationary mounting plate for either a heavy-duty camera tripod or TeleVue Gibraltar mount by using the predrilled holes.Refer to the Mounting 92mm f5 or f7 to the Gibraltar mount with a 7" Sliding bar instruction sheet. The bar does not "slide" when used in this manner. It can also be used as a spacer to lift the Traveler or Stowaway high enough off the Losmandy LMDUP plate so that the focuser knobs clear the LMDUP (Losmandy Universal Plate). Please refer to Using your Traveler or Stowaway with 13.5" Losmandy Universal Plate to see how this is accomplished.

SB0800$25.00 in stockAdd SB0800 To My Cart
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10" Sliding Bar (SB1000)


Can be used in the same manner as the 7" Sliding Bar (SB0800) described above. This bar was designed to provide the extra length needed to push the Traveler forward in order to counterbalance accessories when doing eyepiece projection photography.
SB1000$25.00 in stockAdd SB1000 To My Cart
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15" Dovetail Plate (DOVE15) - 400, 600E, 900, 1200, Mach1GTO
The 15" version of our dovetail plate is suited for the 130 f8 StarFire EDT, 155 f7 StarFire EDFS, ARO Maksutovs, Takahashi scopes and other instruments of similar size. The knob assembly features a brass pin with a tapered end to hold your sliding bar firmly without marring the aluminum
Use with the 15" Sliding Bar (SB1500), which is sold separately. These are some of the applications:

Mounting plate

  • 400, 600E, 900,1200 or Mach1GTO German equatorial mounts (all models).
  • All Takahashi mounts with the 2-hole mounting pattern (EM-10, Teegul, etc) - use the Q4044 adapter plate.
  • GiroDX mount - use the Q4044 adapter plate.

Accessory plate - Attach to the top of our Astro-Physics mounting rings (diameters 5"-8") or rings from Parallax Instruments that have the Astro-Physics hole patterns (you can request it). Note, you must also use a mounting plate on the bottom of the rings with the same distance, i.e. the DOVE15, FP1500, 1200RP15, 900RP, FP1800 (only if you use the innermost hole spacing) or the cradle plate of the Astro-Physics 800 mount (prior model).

DOVE15$95.00 in stockAdd DOVE15 To My Cart
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15" Sliding Bars (SB1500)
Use with 15" Dovetail Plate. These are a few of the possible applications:

Attach to the bottom of mounting rings or cradle - 130 StarFire EDT, 155 f7 StarFire EDFS or any rings or cradle with a flat mounting surface and 1/4-20 holes.

Attach to tube assembly - ARO Maksutovs and other similar instruments.

Attach accessories
SB1500$45.00 in stockAdd SB1500 To My Cart
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Adapter to Use DOVE08 with 900 or Mach1GTO Mount (Q4047)

Since the 8" Dovetail Plate (DOVE08) is so short, an adapter is required to raise it up above the top of the 900 or Mach1GTO declination axis so that the knobs clear.

Please Note: This adapter attaches to the Mach1GTO with four 1/4-20x1" Flat Head Socket Cap Screws. DOVE08's purchased before Nov. 1 2006 did not include these screws in their fastener packets. If you will be using a DOVE08 purchased before Nov. 1, 2006 with this adapter and a Mach1GTO, you will need to order the four 1/4-20x1 Flat Head Socket Cap Screws separately. If ordering the Q4047 along with a new DOVE08 after Nov. 1, 2006, you will have all the required fasteners. If needed, the screws may be requested at checkout under "Comments / Special Instructions."

Q4047$60.00 in stockAdd Q4047 To My Cart
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Adapter to use Dovetail Plates with All Takahashi Mounts that Have
2-hole Mounting Pattern and the GiroDX Mount (Q4044)


This adapter will enable you to use our dovetail plates with your EM-10, EM-200, Teegul and other Takahashi mounts; Giro2DX or any mount that has, or can be adapted to have, a 2-hole M8 mounting pattern on the top of the declination axis. The holes are spaced 1.375" apart.

Bolt the Q4044 adapter to the mount (screws provided), then attach our DOVE08 (as shown), DOVE15, DOVELM2, DOVELM16, DOVELM16S or DOVELM (previous model) You will also need the corresponding sliding bar. Note: this adapter is black anodized as shown in the image above.
Q4044$40.00 in stockAdd Q4044 To My Cart
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8.5" Dovetail for Losmandy D Series Plate (DOVELM2)

This plate is made by Astro-Physics and can be used with a variety of mounts. If you already own the 13.5" male Losmandy D series plates, this is the dovetail for you. The knob assembly features a brass pin with a tapered end to hold your sliding bar firmly without marring the aluminum. The DOVELM2 is 8.5" long and weighs 2.3 lbs.

A center hole on the knob side allows you to move one of the knobs to accomodate the short (7") Losmandy Universal plates. The short Losmandy plates should only be used with one of the knobs moved to the center position. Otherwise, the knobs of the DOVELM2 are spaced too far apart to grip the short plate properly. Make sure that you orient the DOVELM2 so that one of the knobs is always at the objective end of the plate. Otherwise, you will not be able to utilize the safety screw on the bottom of the male dovetail. Using the middle hole with the 7" plate gives over three inches of travel for balancing.

Warning: Older dovetail mounting plates offered by Celestron may also work with the DOVELM2. However, dovetail plates offered by Celestron in 2004 (and perhaps earlier) are made to a different spec. These newer plates do not fit properly into the DOVELM2 and will slip. We encourage everyone using a plate manufactured by Celestron to test that plate in the DOVELM2 without the telescope first to be sure that it can be locked down securely.

Mounting plate
  • 400, 600E, 900,1200 or Mach1GTO German equatorial mounts (all models).
  • All Takahashi mounts with the 2-hole mounting pattern (EM-10, EM-200, Teegul, etc) - use the Q4044 adapter plate.
  • GiroDX mount - use the Q4044 adapter plate.
In September 2002, we updated this plate to include a wider safety recess to accommodate the safety knobs of the Losmandy D series plates. This change added 4 3/8 more inches of travel when balancing your telescope.

This dovetail plate cannot be used as an accessory plate. However if you use Astro-Physics rings or rings from Parallax Instrument (with the Astro-Physics hole pattern), you can attach the same Losmandy D series dovetail to the top of the rings to use as an accessory plate.

If you are using the 17.25" or longer Losmandy D series dovetails with our 900 or Mach1GTO mounts, we recommend the DOVELM16S. The DOVELM16 was designed to use the long plates on the 1200 mounts.

DOVELM2$100.00 in stockAdd DOVELM2 To My Cart
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16" Dovetail for 1200 Mounts and Losmandy D Series Plate (DOVELM16)
This Astro-Physics plate is 16" long and beefier than the DOVELM2. It was designed to carry heavier loads on any of our 1200 mount models. Use it with Losmandy D series male dovetail plates that are 17.25" or longer if you are attaching a large refractor, Ritchey-Chretien, C-14, or other large instrument. You can also use it with the 13.5" Losmandy D series plate for your shorter instruments, however, if that is your only instrument, we recommend the DOVELM2.

The DOVELM16 features 2" diameter knobs to give a good, solid feel as you tighten them. The clamping blocks grip your dovetail plate firmly. Springs keep the blocks in an open position until you tighten them. The unique design of the clamping blocks ensures that they remain properly aligned with no need for additional guide pins, and the brass washer on the knob allows firm tightening with no binding.
This plate includes wide recesses to accommodate the safety knobs of the Losmandy D series plates. It also features a cutout on the underside to allow better knob clearance and to reduce weight.
The mount hole pattern is slightly off-set so that you can position it on your mount in a more forward or backward position, as desired. This allows additional balancing flexibility.
Weight: 5.1 lbs
  • For 17.25" or longer Losmandy D series plates - allows 4.75" of travel.
  • For 13.5" Losmandy D series plates - allows 1.5" travel with both clamps fully engaged. Since the 13.5" male plate is considerably shorter than the 16" female dovetail plate, you should also consider other potential interference issues with your telescope.

As with all of our female dovetail plates, it is very easy to attach the mating male dovetail plate. Simply tilt your Losmandy plate, with the scope attached, into position. Then, tighten the knobs. There is no need to struggle as you try to insert the Losmandy plate (with your heavy telescope attached) into the end of the dovetail, as with some dovetail plate designs.

Please note that this plate cannot be used with the 900 or Mach1GTO series mounts due to knob clearance issues in some positions. The DOVELM16S, however, is perfectly suited for larger instruments on either the 900 or Mach1GTO.

Although the 400 series mounts have a matching hole pattern, we do not recommend using this large plate with such a light mounting. Likewise,starting in 2007, we no longer provide the smaller hole pattern for the 600E series of mounts. To use Losmandy D series plates with either of these smaller mounts, we recommend the 8.5" DOVELM2.

Warning: Older dovetail mounting plates offered by Celestron may also work with the DOVELM16. However, dovetail plates offered by Celestron in 2004 (and perhaps earlier) are made to a different spec. These newer plates do not fit properly into the DOVELM16 and will slip. We encourage everyone using a plate manufactured by Celestron to test that plate in the DOVELM16 without the telescope first to be sure that it can be locked down securely.

DOVELM16$135.00 in stockAdd DOVELM16 To My Cart
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16" Dovetail for 900 or Mach1GTO Mounts and Losmandy D Series Plate (DOVELM16S)

The DOVELM16S was designed to provide maximum support of the Losmandy D Series Dovetail plates on the 900 and Mach1GTO mounts. It is identical to the DOVELM16, however the knobs are 1.5" diameter to allow for proper clearance on the 900 or Mach1GTO mount. It weighs slightly less at 4.9 lbs. Please read the description for DOVELM16 for full details.

Although the 400 series mounts have a matching hole pattern, we do not recommend using this large plate with such a light mounting. Likewise,starting in 2007, we no longer provide the smaller hole pattern for the 600E series of mounts. To use Losmandy D series plates with either of these smaller mounts, we recommend the 8.5" DOVELM2.

Warning: Older dovetail mounting plates offered by Celestron may also work with the DOVELM16S. However, dovetail plates offered by Celestron in 2004 (and perhaps earlier) are made to a different spec. These newer plates do not fit properly into the DOVELM16S and will slip. We encourage everyone using a plate manufactured by Celestron to test that plate in the DOVELM16S without the telescope first to be sure that it can be locked down securely.

DOVELM16S$135.00 in stockAdd DOVELM16S To My Cart
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Losmandy D Series Plate

These male dovetail plates are used in conjunction with our DOVELM2, DOVELM16 and DOVELM16S described above (also the previous model DOVELM). The Losmandy D Series Plate attaches directly to your telescope or your telescope mounting rings and fits into the saddle as shown at right. The most common sizes are listed below. If you have other requirements, please call.

Please refer to the following instruction sheets:

Losmandy Dovetail Plate - attaching the plate to your rings - PDF document
Using Your Traveler or Stowaway with 13.5" Losmandy Universal Plate - PDF document

The plates are produced by Hollywood General Machining (makers of Losmandy products), and may have some minor cosmetic flaws, for which we cannot be held responsible.

All required fasteners are included.

  • LMDAP4/5 13.5" plate with adapters for Astro-Physics rings, can also be used as an accessory plate on top of the rings, weighs 2.0 lbs.
  • LMDAP4/5$95.00 in stockAdd LMDAP4/5 To My Cart
  • LMDAP6/7 17.25" plate with adapters for Astro-Physics rings, can also be used as an accessory plate on top of the rings, weighs 2.5 lbs.
  • LMDAP6/7$95.00 in stockAdd LMDAP6/7 To My Cart
  • LMDC8 13.5" plate for Celestron 8"SCT, weighs 2.0 lbs.
  • LMDC8$95.00 in stockAdd LMDC8 To My Cart
  • LMDC925 19" plate for Celestron 9.25"SCT, weighs 3.5 lbs.
  • LMDC925$140.00 Call Contact Astro-Physics about LMDC925
  • LMDC11 17.25" plate for Celestron 11" SCT, weighs 2.0 lbs.
  • LMDC11$95.00 in stockAdd LMDC11 To My Cart
  • LMDC14 23.75" plate for Celestron 14" SCT, weighs 3.75 lbs.
  • LMDC14$140.00 Call Contact Astro-Physics about LMDC14
  • LMDM8 13.5" plate for Meade 8" SCT, weighs 2.0 lbs.
  • LMDM8$95.00 in stockAdd LMDM8 To My Cart
  • LMDM10 17.25" plate for Meade 10" SCT, weighs 2.5 lbs.
  • LMDM10$95.00 in stockAdd LMDM10 To My Cart
  • LMDM12 19" plate for Meade 12" SCT, weighs 3.5 lbs.
  • LMDM12$155.00 in stockAdd LMDM12 To My Cart
  • LMDUP 13.5" Universal plate for the Traveler; Stowaway, TeleVue, Takahashi, Vixen and Meade Refractors; Parks and Questar scopes, weighs 2.0 lbs. (For rings or clamshells using M-8 fasteners, you must substitute 5/16"-18 fasteners of the appropriate length to use this plate.)
  • LMDUP$80.00 in stockAdd LMDUP To My Cart
  • LMD1725 17.25" plate without adapter blocks for Astro-Physics 10" f14.6 Maksutov-Cassegrain or other large instrument with rings having a 3.5" hole spacing.
  • LMD1725$65.00 in stockAdd LMD1725 To My Cart
  • LMD135 13.5" plate without adapter blocks for rings with 3.5" hole spacing.
  • LMD135$65.00 in stockAdd LMD135 To My Cart
  • LMAPBLOCKS Losmandy Blocks, used to attach our Mounting Rings (3.2" spacing or center hole) to Losmandy D Series dovetail plates with 3.5" spacing.
  • LMAPBLOCKS$65.00 in stockAdd LMAPBLOCKS To My Cart
  • LMDSBS Side by Side Plate, allows you to mount two telescopes (or telescope and a guidescope) side by side. You also need two of the D series plates above. Keep in mind that this plate weighs 7.1 lbs. and each of the other plates adds a few more pounds. When you are calculating the amount of weight you are putting on the mount, you need to add the plates, rings, telescopes and other accessories. Also consider that when you are mounting scopes side by side, the weight of at least one of the instruments is displaced from the center of the mount, which makes the effective load heavier still (try holding a bag of groceries away from your body and you get the idea)
  • LMDSBS$253.00 Call Contact Astro-Physics about LMDSBS
  • LMDMM Losmandy D Series male to male dovetail plate - 13.5" length, 0.75" thick.
  • LMDMM$80.00 Call Contact Astro-Physics about LMDMM
  • LMDA Losmandy D Series Dovetail Plate Adapter : This single-clamp, female adapter is used when you mount one of the above male D series plates on top of your scope as an accessory plate. Use one for a finder or a 35mm camera (attach our piggyback camera bracket for even more versatility!). Use two (one for ech mounting ring) for piggybacking a guidescope or second smaller scope.
  • LMDA$42.00 in stockAdd LMDA To My Cart
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This page was last modified: March 17, 2008

Astro-Physics, Inc.
11250 Forest Hills Road, Machesney Park, IL  61115, U.S.A.
Phone: 815-282-1513   Fax: 815-282-9847