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Kostas Petsas

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  1. I have some up for sale. Check this:   http://www.eoshd.com/comments/topic/2570-the-diopter-thread/?p=43189
  2. If anyone is still interested in diopters, I have a couple of spare +0.5 diopters with 72mm thread. These are no achromatic doublets; they are single element, but are excellent quality and personally I use them anytime on my Iscorama (with results comparable to the all time classic Tokina +0.4 achromat). On an Iscorama +0.5 will enable you to get closer than the 2m minimum focus distance of the Isco, in the 1m to 2m range. A second +0.5 stacked will enable you to get a nice close up in the 0.5m-1m range. Usually I have all range covered with only two of those. As a bonus, these are thinner than the Tokina single element ones, so you don't get vignetting even if you stack 2 of them. The 72mm thread is nice, since they directly fit on the Iscorama, or on the redstan front filter clamps. I have also used them to get a close up of an eye, with a Canon EF 135mm f2.0 L lens.
  3. To revive this old thread. I did a small test yesterday. Tested the Iscomorphot 8/1.5x vs the Zeiss Ikon 22 1.5x vs the Bolex Moller 8/19/1.5x. All 8mm anamorphots with a 1.5x anamorphic ratio. It appears to me that the Zeiss and the Iscomorphot are very very similar in quality and both have a characteristic smearing at wide apertures (which is what I expected). Interestingly, the Iscomorphot is not very good when the taking lens is focused at infinity, but gets somehow better when the taking lens is focused around the 5m mark. At least it gets almost as good as the Zeiss, and it focuses even closer than the Zeiss Ikon. I guess you wouldn't be able to achieve infinity like this, but if you need to shoot in an interior space at wide apertures it should be ok like that. That way, both anamorphots may be considered as useable at f=4 (f=2.8 hmmmmm...), but nowhere as near as the Bolex. The Bolex crashes them both from wide open. The image with the Bolex appears to be even sharper than with the taking lens alone... Imagewise, it is definitely the best available anamorphot in 1.5x, even if you have to pay 3k for it :P. Of course the rack focus ability on the Zeiss and Iscomorphot are very handy and a unique recipe from Isco. And I must say that the smearing may be an artistic choice to achieve a mor "organic" look on tack sharp digital cameras... I will try to post all this on YouTube when I get the time someday...
  4. Thank you for your test Nick. I currently happen to have an Iscomorphot 8/1.5x and this inspires me to do a side by side comparison of the two lenses... I suspect that only the lens coatings were made by Zeiss on the Ikon, and the lens itself was manufactured by Isco Gottingen using the well kept secret Isco focusing recipe. Hence, I expect the lenses to perform similarly. Both are great lenses for pocket CinemaScope. K.
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