Astro-Tech 1X Field Flattener For Astro-Tech AT80EDT Triplet APO Refractor

This Astro-Tech AT80EDTFF 1X field flattener is designed specifically for prime focus astrophotography with the Astro-Tech AT80EDT ED triplet apo. While it may also work well with other brands and models of f/6 refractors that use a 2" focuser, its performance with other scopes is not guaranteed.

The fully-multicoated Astro-Tech AT80EDTFF field flattener leaves 480mm focal length f/6 Astro-Tech AT80EDT refractor in its native state, but flattens the field up to a full frame format camera.  This provides images that are sharply focused out to the corners of DSLR, CMOS, and CCD imaging chips. Stars look sharp and point-like all the way across the field in your images. You don't have to worry about photos that are sharp in the center and blurry at the edges.  Full frame chips will still be a bit of a task to get flat to every corner.  You might see some curvature with large chips.

The Astro-Tech AT80EDTFF field flattener can be connected to your AT80EDT using it's M63 threaded end.  This threaded end will either connect directly to the focuser drawtube, or connect to your camera angle adjuster.

The camera side of the AT80EDTFF field flattener has 48mm T-threads to connect to a T-ring and DSLR camera body. A slip-on soft rubber cover protects the T-threads when the reducer is not in use, while a second slip-on cover is provided for the 2" scope-side barrel. Back focus is 55mm from the shoulder of the reducer to the image plane, the standard spacing for imaging devices.  The top of the field flattener will also unthread from the body exposing a 2" filter thread on the bottom of the piece you just unthreaded.  This will allow you to put 2" filters in line with your imaging train without the need for a filter drawer or filter wheel.