Field Flattener Design

In this cassegrain configuration the convex secondary mirror acts as a field flattener and relays the image through the perforated primary mirror to a final focal plane located behind the primary.

Field flattener design.

The field flattener is everyone s most common example of this negative power element that reduces the field curvature. Either use of a curved detector or sacrificing much of the exquisite field quality by using flat detector. Nikon s field flattener lens system is an optical system that minimizes the curvature of field across the entire optical system. And conveniently it s one that s easy to understand even without the coefficients.

A pretty significant and real telescope. I had this same conversation with yuri. This field flattener is fully multi coated on two element lens allowing the most efficient light transmission without sacrificing the precious collected light from your telescope. Observation can be enjoyed with a sharp and clear image throughout the entire.

So i ve shown a ray trace here of a 2 millimeter telescope. This leaves two choices. You will see bright and sharp image across the entire field. Flat image field lens effect of a field lens for flattening the image surface 1.

Calculation approaches 2. Field flattener lenses counteract the petzval field curvature of an optical system. While the field isn t as flat as i hoped for it is a lot better than no flattener. Schmidt camera field flattener good example for the use of a single lens flattener is the schmidt camera which is exclusively a photographic instrument its only remaining primary aberration is strong field curvature.

I wanted to add an onag to my system and it consumes 69 mm. It accomodates f5 to f8 refractor telescope. This advanced lens design provides consistent edge to edge sharpness while compensating astigmatism and coma aberration at the same time. I managed to get a tak toa 67 to work acceptably with my tec180 at 112 mm.

Canon 10 x 42 l is wp 18 x 50 is all weather and swarovski el 8 5 x 42 el 10 x 42 and in astronomic telescopes. Advanced lens design lecture 8. Field flattening 2013 12 03 herbert gross winter term 2013. Field flattener lenses in binoculars improve edge sharpness and lower the distortion.

If i remember correctly he said something like 100 mm would be the most. It uses mirrors as you can see.