This is a rotating field flattener for the Stellarvue SVX80T-3SV and SV80T-3SV. This flattener is formatted for this telescope specially and it threads into the adapter on the focuser drawtube.
This flattener will also work with the following telescopes but you need to add this adapter in order to thread it to your focuser drawtube:
- SV80ST refractors that use either a 2.5" Stellarvue or a 2.5" Feather Touch focuser
Please note: This flattener will not work with older 80 mm Stellarvue Telescopes that were made using a 2" focuser.
On the camera side of this flattener is a standard M48X.75 thread. The backfocus from the base of this thread is 55 mm. So this flattener as it comes will work with a DSLR with a 48 mm t-ring. It will also work with a ccd camera that uses the M48 thread and has a 55 mm back focus. If your ccd camera uses another thread and/or if the back focus is not exactly 55 mm, please call us and we can provide you with a modified version of this flattener with the proper adapter to meet your requirements.
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This flattener works perfectly optically, flattens the full frame 35mm field of my D810a dslr. Stars are round to the corners. Rotating camera design is much more convenient than the standard flattener which requires rotating the whole focuser assembly, which can result in the focuser knobs colliding with piggybacked equipment like a guidescope or finder on the main scope. Only flaw is a slight binding in one portion of the 360 degree rotation. This should be the standard flattener that comes with the scope.