The flattener is a lens that evens out the field, as this is slightly curved by the primary optics. This curvature causes stars that are imaged at the edge of the field of view to be less sharp. The flattener, also called a field flattener, corrects this effect. Astrophotographers can then enjoy images where the stars remain sharp right out to the edge of the exposure. The flattener is installed between the telescope and the camera.
The R-Flattener provides a larger corrected image field compared to the Model A. It is therefore the better choice if you want to photograph with a full-frame DSLR camera or an astro camera with a comparably large sensor. Another special feature is the integrated rotator, which can be used to rotate the image field to the desired orientation.
This very high quality Flattener is an FMC Triplet Apo Design with the best optical glasses from Ohara, Japan.
Installation:The flattener is securely screwed on to the focuser thread. Simply unscrew the coloured anodised end piece, as shown in the picture on the right. This end piece is used to attach a socket, but is no longer required when using a flattener. Keep it safe in case you want to use the lens visually with a diagonal mirror. The flattener can simply be screwed into the focuser’s thread.
A T2 thread is supplied for mounting a camera. If you want to use a DSLR camera, use the correct T2/bayonet adapter for your camera manufacturer. You will end up with a securely built system - highly stable with no tilting!
The flattener is adjustable. Set the correct distance and secure it using the knurled locking ring. So you do not need a separate extension sleeve.
Filters can be screwed directly on to the flattener using the M48 thread. Simply screw off the end piece on the camera side to do so. This reveals an M48 thread into which the filter can be screwed. Then screw the flattener back together and you're done!
