Performance from item is typical of Orion's products, excellent. It attached securely to camera t-adapter with threads. Its body length requires removal of one extension tube. Price is reasonably. Delivery was longer than expected.
After almost 2 months of waiting, the order finally arrived, I can't wait to test the quality. I only recommend if you buy do not ask for transportation by USPS, horrible service. As for OPT I am very happy with the advice given by the sellers.
I did a test taking pictures of M8 and M20 and the stars appear as points in the whole field, does not modify the focal and does not add reflections or color to the image,. Excellent product
Provides clearly observable improvement in the flatness of the field of my WO Zenithstar 66 f/5.88 ED refractor. Imaging on an 8300M chip (18x13.5mm, 22.5 mm diagonal), star images are much more round (less oval) to the corners of the field.
First off, it works great! I photograph through an Orion ED80mmCFT with my DSLR- Pentax K5iiS (APS-C sensor, 23.7 x 15.7 mm). I was experiencing elongated stars near the edges of my photos and was forced to crop them. After my very first shot , I zoomed into the corner and saw excellent pinpoint stars. I am very satisfied with this flattener.