Astro-Physics

Astro-Physics

GTOCP4 Control Box for all GTO Mounts, except Mach2GTO. Order new 2-Pin power cable (GTOCP4)

All GTO mounts(except the Mach2GTO and 1150GTO) produced since 1998 can be easily upgraded!!! The GT

Astro-Physics

GTO Keypad with Keypad Protector - for GTOCP1, GTOCP2 and GTOCP3 Control Boxes. Serial # of mount required for purchase. (KEYVFK)

This Keypad should only be purchased for use with the GTOCP1, GTOCP2 and GTOCP3 control boxes. This

Astro-Physics

GTO Keypad with Keypad Protector for GTOCP4, GTOCP5 and GTOCP6 Control Boxes. Serial # of mount required for purchase. (KEYVFK2)

This Keypad should only be purchased for use with the GTOCP4, GTOCP5 and GTOCP6 control boxes with v

Astro-Physics

Absolute Encoder Kit for 1100GTO - Standard Temperature (11AE-4-KIT)

The photo above shows the 1100GTO with either version of the absolute encoders installed - standard

Astro-Physics

Right-Angle Polar Alignment Scope Adapter for 1200GTO Mounts (RAP1200)

Our Right-Angle Polar Alignment Scope can be used with the Mach1GTO and all 900 and 1200 mounts (exc

Astro-Physics

Right-Angle Polar Alignment Scope Adapter for 900GTO Mounts (RAP900)

Special note regarding a select few 900 mounts:      Please check this linked photo t

Astro-Physics

EPROM Microcontroller Chip w/ V2 Version Firmware for GTOCP3 Control Box, Extraction Tool (CHIPKITV2)

If you already own the GTOCP3 control box, you may wish to consider upgrading the ROM chip to take a

Astro-Physics

1100GTO RA & Dec Auto-Adjust Motor/Gearbox Upgrade (S1100MGW-UP)

May 7, 2025.  We have a limited number of upgrades available for mounts shipped before January

Astro-Physics

1600GTO RA & Dec Auto-Adjust Motor/Gearbox Upgrade (S1600MGW-UP)

May 7, 2025.  We have a limited number of upgrades available for mounts shipped before April 20

Astro-Physics

Flat Surface Adapter with Flat Pier Plate - for Mach2, Mach1, 600E and 400 Mounts to use 8" Astro-Physics Portable Piers (ADATRI-8FP)

Ever find yourself wishing that you had a bigger mount? Short of a magical spell, you can maximize t

Astro-Physics

Flat Surface Adapter with Flat Pier Plate - for 1100 and 900 Mounts to use 10" ATS Piers (119FSA-10ATS), inside surface not anodized

Ever find yourself wishing that you had a bigger mount? Short of a magical spell, you can maximize t

Astro-Physics

Pier Adapter Knob Kit for 900 Mounts (9KBKIT)

This kit contains four machined and black-anodized Pier Adapter Knobs and 1/4"ID x 1"OD flat washers

Astro-Physics

Flat Surface Adapter with Flat Pier Plate - for Mach2, Mach1, 600E and 400 Mounts to use 8" ATS Piers (ADATRI-8ATS)

Ever find yourself wishing that you had a bigger mount? Short of a magical spell, you can maximize t

Astro-Physics

Standard Pier Adapter for 900 Mount, Fits 8" Astro-Physics Piers (900SPA)

The 900SPA is a replacement for your 900 Standard Pier Adapter if yours is damaged. The base is 7.73

Astro-Physics

Counterweight Shaft Adapter with Aluminum Bronze Insert for Mach1GTO Mounts shipped since July 2014 (SM1CSA)

If your Mach1GTO mount is is frequently used as a portable mount, you may wish to consider upgrading

Astro-Physics

1200GTO Counterweight Shaft Adapter with Aluminum Bronze Insert (S1200CSA)

If your 1200 is frequently used as a portable mount, you may wish to consider upgrading to this coun

Astro-Physics

Counterweight Shaft Adapter with Aluminum Bronze Insert for 900 Mounts (see exception) and Mach1GTO Mounts shipped before July 2014 (S900CSA)

If your 900 is frequently used as a portable mount, you may wish to consider upgrading to this count

Astro-Physics

1100GTO Counterweight Shaft Adapter with Aluminum Bronze Insert (S1100CSA)

If your 1100GTO mount is is frequently used as a portable mount, you may wish to consider upgrading

Astro-Physics

22" Mach2GTO RA/Dec Cable from Backplate to GTOCP5 (CABM2RD22)

This custom cable will provide an additional 6.5" of length than the standard R.A. and Dec. cables t

Astro-Physics

13.7" x 1.875" Diameter Counterweight Shaft, Stainless Steel (M2043)

This shaft has a usable length of 13.7" and is designed to be used with our 5 lb. (5SCWT), 10 l

Astro-Physics

Counterweight Shaft Safety Stop, One-Piece, Washerless (M12676)

Astro-Physics

9.25" x 1.875" Diameter Counterweight Shaft Extension, Stainless Steel (M12675)

The 8.5" Counterweight Shaft Extension completes the current 1.875" diameter counterweight shaft ens

Astro-Physics

14.5" x 1.125" Diameter Counterweight Shaft, Stainless Steel (M8084-B)

This is the standard shaft that is shipped with the Mach1GTO. It is the same diameter - 1.125" - and

Astro-Physics

Y-Cable for Mach1GTO Mount (SM1GYCR)

It is always a good idea to have a backup Y-cable for your mount. This is particularly true for any

Astro-Physics

Mach1GTO Precision-Adjust Rotating Base/ Hi-Res Azimuth Adjuster Upgrade Kit (M1RAUP)

The Mach1GTO Precision-Adjust Rotating Pier Base / Hi-Res Azimuth Adjuster is standard on new mounts

Astro-Physics

37" Dec Cable for GTOCP1 and SMDCP1 Control Boxes of 1200GTO or SMD, 900GTO or SMD (SRDC37)

This 37" replacement cable is available if you damage or lose yours. Mounts that can use this cable:

Astro-Physics

12" RA Cable for GTOCP1 and SMDCP1 Control Boxes of 1200GTO or SMD, 900GTO or SMD (SRDC12)

This 12" replacement cable is available if you damage or lose yours. Mounts that can use this cable:

Astro-Physics

3600GTO Cable to Connect Limit Switch Connector on Cable Port Plate to GTOELS (CAB36LS)

This cable is needed if you plan to control your Limit Switches with the GTOELS Control Box.

Astro-Physics

Y-Cable w/42" Declination Length for 1100 Quick Release Servo Box (S1100GYCR42)

This is a custom cable for the 1100GTO (without Absolute Encoders) that is used when setting up the

Astro-Physics

Machined Safety Stop Knob. 5/16"-18 thread - For 1.125" Diameter Counterweight Shafts. (MSSKB)

You asked for it … now we’ve got it! The Mach1GTO’s counterweight shaft is now &

Astro-Physics

Polar Alignment Scope Plug Adapter (M4037)

This adapter threads into the rear of the right ascension axis of the mounts specified below to allo

Astro-Physics

Flat Surface Adapter with Flat Pier Plate - 1150, 1100 and all 900 Mounts - for 8" ATS and other non-Astro-Physics piers (119FSA-FP), inside surface not anodized

If you are ordering a 8" ATS pier for your 1150, 1100 or 900 mounts, you will need to order this ada

Astro-Physics

Flat Pier Plate for 1150, 1100 and all 900 Mounts - for 8" ATS and other non-Astro-Physics Piers (119FP)

This Flat Pier Plate (119FP) has been machined to the specifications of the Advanced Telescope Syste

Astro-Physics

16.4" x 1.875" Diameter Counterweight Shaft , Stainless Steel- 1100, Mach2, Mach1, 1200, 900 (see exception) (M9404-B)

This is the current shaft for 1150, 1100 and 900 mounts. It can also be used as an optional "heavywe

Astro-Physics

22" x 1.875" Diameter Stainless Steel Counterweight Shaft - 1600, 1150, 1100, 1200 (all models), 900 (see exception). (M12601-E)

Like its predecessors, this 1.875" diameter counterweight shaft is precision machined from solid 303

Astro-Physics

Flat Surface Adapter -attach 1150 or 1100 Mount or 900 Pier Adapter and Wedge to a flat surface (119FSA), inside surface not anodized

The 8” Flat Surface Adapter (119FSA) allows the 1100GTO Mount and all versions of the 900 Moun

Astro-Physics

Polar Scope Cover for 900GTO Mounts shipped since October 2005 (Q9700)

These covers allow you to keep your Polar Alignment Scope protected while remaining threaded in your

Astro-Physics

Cover for Back of RA Axis for 900GTO Mounts shipped since October 2005 (M9403)

This sight hole cover threads onto the back of all 900GTO mounts shipped since October 2005. The re

Astro-Physics

5/16-24x1/2" Flat Point Set Screw to Use in Place of RA Clutch Knobs-900 Mounts (F0021)

If you operate your mount remotely and are concerned about cables snagging on the RA clutch knobs, y

Astro-Physics

Altitude Adjuster Assembly for 900 Mount, all models (9ALKIT)

Individuals who own the very earliest 900 mounts may want to consider upgrading to this more substan