Application: Digital imaging with CCD and DSLR cameras. Also suitable for video and 35mm film cameras.
155TCC with Machined Aluminum Covers
The success of the 160TCC Telecompressor
Corrector prompted us to offer a version that was designed to work with
the 155
f/7 StarFire EDF (155EDF) and 140
f/7.5 StarFire EDF (140EDF4). Since the focal length of these two
scopes is fairly close, it can be used with either one, however
the resulting compression is slightly different as shown in the specifications
below.
Follow this link to some 140EDF4 + 155TCC sample images!
Optimal performance depends on these factors:
- The 155TCC must be used with the 4" focuser. If your 155 or 140 StarFire has the 2.7" Focuser, you can upgrade to the 4" version (easy installation that you can do yourself).
- 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.
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.
