rayn Posted June 23, 2001 Share Posted June 23, 2001 I'm trying to find a high quality close up diopter for my Pentax 645 FA 150/2.8 lens. This lens has a 67mm filter thread and there are few diopters to be found at this size (Canon's closest is 72mm, Nikon's closest is 62mm). I know Pentax makes some 67mm close-up diopters for their 67 system, but have heard very little about them. B&H sells three powers at about $100 each. Will they work with my 645 lens? Are they high quality, two element diopters? (B+W, Hoya, etc. are cheap one element). I'd rather not use step-up or step-down rings. Thanks. Link to comment Share on other sites More sharing options...
art_haykin Posted June 24, 2001 Share Posted June 24, 2001 Any close-up diopter lens you can adapt to your lens will work if it's big enough to cover without vignetting. Single diopter lenses are NOT necessarily low quality, and if you understood how they worked, you'd better understand this. And just what is wrong with step-up or down rings? I used them for yearswith great results. The reason the larger ones are so expensive is that the volume of sales is comparatively low. Link to comment Share on other sites More sharing options...
rayn Posted June 24, 2001 Author Share Posted June 24, 2001 I don't want to use step-up rings because I'd have to buy and carry a second set of 81A and Polarizer filters to fit the new close-up lens. My lens hood also wouldn't fit over the 72mm step up, and stepping down can vignette. I didn't mean to insult the single element lens users out there. I only ask this question because I've never heard of the Pentax one and I don't want any "surprises" after paying $100 for it. Link to comment Share on other sites More sharing options...
art_haykin Posted June 24, 2001 Share Posted June 24, 2001 It seems to me that any new, brand name lens, filter, or anything, that didn't perform as represented could be returned to the dealer. If your dealer is uncooperative, find a new one. Link to comment Share on other sites More sharing options...
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