ASTRO-PHYSICS
F/6.1 CCD Telecompressor Corrector for 175 f/8 StarFire EDF (175TCC)

Designed for: 175 mm f/8 StarFire EDF
Application: Digital imaging with CCD and DSLR cameras. Also suitable for video and 35mm film cameras.

 

175TCC and ADATCC1 on SBIG STL11000
(Camera not included with either A-P product)

 

This optimized design uses 3 elements of high-index glass to widen and flatten the field while increasing the photographic speed of the 175 StarFire EDF triplet refractor from f/8 to f/6.1. It is designed to be used with a variety of cameras when matched to the appropriate adapter.

The 175EDF operating at f/6.1 (0.76x compression) is an ideal match for large format cameras. Extreme detail can be captured in very short time thanks to the fast focal ratio. This accessory is a must for H-alpha imaging where speed and resolution allows one to achieve incredible results. Wide-field images will be highly detailed, which allows the astro-imager to make very large prints without doing time-consuming mosaics. Even when enlarged to 30 inches, a single image will still have pinpoint stars across the entire frame.

Optimal performance depends on these factors:

  • The distance of the back of the housing to the image plane must be within 1 mm of ideal (80.8 mm +/- 1 mm). Astro-Physics produces several adapters (listed below). These adapters, when used with their respective cameras, provide perfect spacing. Please review the document "0.76x CCD Telecompressor Corrector Spacing Requirements" for more information. Adapters for other cameras can be custom ordered from PreciseParts.

    Important: The distance must be the OPTICAL distance - NOT the mechanical distance. Please be sure that you have accounted for the indexing effects of your filters, sensor cover slips and any other glass in the light path.
  • A UV-IR filter must be installed in the luminance channel in order to preserve the best possible image resolution into the corners of the large formats. Without this filter, the distance will be incorrect and the luminance image will have slightly different scale factor from the RGB channels. Therefore, the various channels will not register properly. Also, the IR must be filtered out to prevent elongation in the corners of the STL format due to difference in lateral magnification of the longest wavelengths.

    Important: the UV-IR filter must match the other filters being used in terms of is effect on the light path. Please check with your filter manufacturer to confirm.

175TCC with Machined Aluminum Covers

When used with the recommended custom adapters, the image is fully illuminated with the recommended cameras. Only 2" round filters will present a tiny, insignificant amount of vignetting in the very corners.

 

Included:
The 160 CCD Telecompressor Corrector comes with beautifully machined anodized aluminum covers: protection befitting the fine optics.

Field size:
Fully Illuminated Circle 2.1" (53 mm) 2.8 degrees
KAF-3200 14.9 x 10 mm 0.80 x 0.54 degrees
KAF-8300 18.0 x 13.5 mm 0.96 x 0.73 degrees
APS-C 22.4 x 14.9 mm 1.20 x 0.80 degrees
16803 36.9 x 36.9 mm 1.98 x 1.98 degrees
35 mm Full Frame 36 x 24 mm 1.94 x 1.29 degrees
Chip not listed? The 175TCC yields 3.221 arcminutes per mm of chip.

175TCC$1,520.00 in stockAdd 175TCC To My Cart

Choose the Appropriate Adapter for Your Application

Custom Adapters
If you need an adapter that is not listed above, we recommend that you contact PreciseParts. Be sure to review the "0.76x CCD Telecompressor Corrector Spacing Requirements"diagram when designing your adapter.

Back to top

Back to Photographic and CCD Accessories
Back to Products

Copyright © 2006-2012, Astro-Physics, Inc. - All Rights Reserved
This page was last modified: January 20, 2014

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