About this product
The Hotech SCA system ensures this premium quality 2-element multicoated optical flattener is positioned precisely on the optical axis for optimum results.
Suitable for f5-f8 refractor telescopes.
The spacing (from the attachment point to the camera sensor) is 55mm so, if using a DSLR camera, you need only a T-Ring.
"The flattener lived up to the claims and now I have the ability to image at the na- tive focal length of my Borg 125SD! Overall, I found the Hotech SCA Field Flattener to be a well-made, well-designed unit and I would recommend it. The coatings on the optics do not add any aberrations, and the flattener provides a very crisp and clear image all the way across the frame of the image." Alan Smallbone writing for 'Astronomy Technology Today'
Review of Hotech SCA Field Flattener
|Average Rating (1 Review): |Excellent quality and value
Tuesday, 16 July 2013 | Barry
A long hard search for a flattener that would work with my F6.9 William Optics Megrez 90 led me to try the Hotech SCA field flattener after a fairly dismal performance from the WO FF/FR III.
The Hotech gives me great star shapes to all edges of the frame when using a dslr whereas the WO left a lot of curvature through the frame accentuated badly in the corners.
I can now image cropping only for stacking artefacts.
The self centering mechanism is a nice feature too not only for keeping the imaging train central but for rigidity, the flattener will remain in place in the focuser without the thumbscrew securing it (I found on removal and would of course always use the thumbscrew too! However the extra reassurance of the centering device providing a lock is great)
The interior of the tube is very dark and the general construction quite robust.
The only flattener that comes close to this quality of performance (from other Megrez 90 users) is the TS flat2 which is considerably more expensive and requires further attachments.
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