Field Flatteners

This auxiliary lens optimizes the edge of field performance with 35mm CCD chips and larger on the NP-101is and NP-127is . . .

The Sky & Telescope Hot Product for 2010 Astro-Tech 2" photographic field flattener improves the image sharpness at the corners of the field with Astro-Tech and TMB apo refractors, but will also work well with any other brand of f/6 to f/8 refractor, as well as Astro-Tech Ritchey-Chrétiens . . .

The Astro-Tech AT152FF 0.72x focal reducer/field flattener is designed specifically for prime focus astrophotography with the AT152EDT triplet refractor.

The EdgeHD .7x Focal Reducer Lens makes your EdgeHD 9.25" one full F-Stop faster than f/10, reducing your exposure time by half to capture the same brightness of object
4-element lens design
Maintains similar flat-field performance as native EdgeHD optical design
Increases field of view by 43% to better capture wide field images
Threads directly onto the 3.25" threads of the EdgeHD which reduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders
Maintains the identical back focus when used at f/10 and provides generous back focus to accommodate additional accessories and wide variety of cameras
Allows use of existing EdgeHD T-Adapters with or without the Reducer Lens

This field flattener from Explore Scientific is designed to work with refrators from f/5 to f/7.

Need to dial in your backspacing on your imaging rig?  The UA 2" field flattener gives you the freedom to set your spacing from 55mm all the way to 80mm.