The focal reducer, in its nominal configuration without the ring, will reduce the telescope focal length by 2.1 times. The corners of the image area will show some elongation of star images, though. Image field of view is approximately 4.0 x 5.4 arc minutes. Nebulosity is faintly recorded and small tracking errors show elongated star image near bottom of frame. Image field of view is approximately 8.0 x 10.0 arc minutes.
Stars are smaller and crisper looking with good resolution at the edge of the field.
Image field of view is approximately 9.3 x 12.4 arc minutes. Star images are still sharp near the edge of the field. Inc. All rights reserved.