roland_vink Posted May 19, 2003 Share Posted May 19, 2003 Has anyone out there used Pentax closeup filters in 67mm filter size (T132, T266, S82)?? They are supposedly 2-element filters for Pentax 6x7 but I want to use them on my new 645 300/5.6 IFED. Are they much better than single element filters from B&W or Heliopan? At over $100 new it seems rather pricey. Nikon makes 2-element closeup filters (5T, 6T) in 62mm filters for around $35. I could use stepping rings, the front element of the 300/5.6 is small enough, but I'd rather not so I can fit the lens cap on. Any ideas, commnents or suggestions welcome Link to comment Share on other sites More sharing options...
bobby mahaffey Posted May 20, 2003 Share Posted May 20, 2003 These lenses are of 2-elements and very high quality. The main difference between them and the Nikon units might be the diopter strength. The S-82 (for 90/2.8 and 105/2.4) yields a maximum magnification of 1:4.1 on the 90mm, and 1:3.7 on the 105mm. It can also be used on the 150/2.8 and 200/4 with "minimum loss of optical performance" according to Pentax, and the magnification will be greater than on the other lenses, but I'm not sure what it will be. The T-132 (for the 150/2.8 and 200/4) gives 1:4.1 on the 150mm, and 1:3.8 on the 200mm. The T-226 (for the 200/4 only) gets to 1:5.2. All of the above magnifications are with the focusing rings set to the closest focusing positions, and they no doubt can be used on the latest versions of these lenses with step rings, ie the new 200mm. I don't know how they would perform on a 300mm lens, but the magnification will be greater than on the prescribed lenses. The Nikon 5T will yield a maximun magnification on a 300mm lens (with focus ring set to 5') of about 1:2, and the 6T on the same lens will get you to about 1:1 or slightly more. Both give excellent quality. Bob Link to comment Share on other sites More sharing options...
steve_rasmussen Posted May 20, 2003 Share Posted May 20, 2003 Test Link to comment Share on other sites More sharing options...
steve_rasmussen Posted May 23, 2003 Share Posted May 23, 2003 The single element filters are just not corrected all that well compared with the two element type. Since the air spaced two element type have four surfaces, they correct out four aberrations. Get a coated two element type or just use tubes instead. Link to comment Share on other sites More sharing options...
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