Field Flattener Design

Field flattener lens is a type of lens used in modern binocular designs e g.

Field flattener design.

And conveniently it s one that s easy to understand even without the coefficients. The field flattener is everyone s most common example of this negative power element that reduces the field curvature. Without field lens 2. A pretty significant and real telescope.

It uses mirrors as you can see. Field flattening 2013 12 03 herbert gross winter term 2013. Calculation approaches 2. Field flattener lenses counteract the petzval field curvature of an optical system.

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. I wanted to add an onag to my system and it consumes 69 mm. This leaves two choices. This advanced lens design provides consistent edge to edge sharpness while compensating astigmatism and coma aberration at the same time.

Flat image field lens effect of a field lens for flattening the image surface 1. 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. As in the schmidt camera this design uses a spherical primary mirror and a schmidt corrector plate to correct for spherical aberration. 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.

If i remember correctly he said something like 100 mm would be the most. 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. It accomodates f5 to f8 refractor telescope.

You will see bright and sharp image across the entire field. Nikon s field flattener lens system is an optical system that minimizes the curvature of field across the entire optical system. Field flattener lenses in binoculars improve edge sharpness and lower the distortion. I managed to get a tak toa 67 to work acceptably with my tec180 at 112 mm.

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.