400-600mm 折射望遠專用減焦/平場鏡 (TV-85)

The three-element multi-coating really pulls in crisp star shapes across the whole frame—my 85mm now gives clean, round stars right to the edges at f/5.6. Exposures feel noticeably shorter too.

Finally got my TV-85 to 480mm f/5.6 and the stars are pinpoint corner to corner—the 3-element optic really does its job. Even at the faster f-ratio, the field flattening is obvious in my first test shots. Slight learning curve getting the spacing right, but once dialed in, it's a game changer for de

This little reducer got my TV-85 down to f/5.6 and the stars are much sharper across the whole frame now. Threaded on smoothly and the coatings look clean. Only wish it came with a dust cap.