ken

ISCO integrated lens is not big, basically same as 16H, and even sharper and less distortion. There is some kind of trade off. You get sharper lens, but loose flare. You get flare, and come with blur too. I found the good flare lens actually is made of single glass, not doublet. Like some vintage lens, or 1.33x lens. So it is not so sharp in edge, or has strong CA. Nowadays to produce flare is easy. There are many way to approach. I used a CPL lens or poor UV lens can make it.

Do you have side view of the lens?

You said tried soviet 58mm. What camera you are using? For the ratio, you can test through circle target to figure out. Focus through lens is not good thing, IMO.

I think it is more likely a 1.5x lens from the shape. 1.33x lens all are for video cam. Can be used in wide angle. This lens looks not for it. The thread there seems to be missing a ring? Can it be turning? If no, the screw might be for adjust fixed distance, like other 1.5x lens for 8mm or 16mm projectors.

Do you think this is possible? The seller has 0 feedback. http://www.ebay.com/itm/142052404500

Closed to these? http://m.ebay.ca/itm/Cheaper-Price-10pcs-set-Computer-Case-Thumb-Screws-6-32-Thread-Black-Metal-/291617452308?nav=SEARCH

If you are lucky. That makes as single focus system.

No, just screwing very very tight.

You can refer my method.

Which part you mean? The left one?

What I said is for FF camera. It is easy to confuse while talk about other small format.

Sorry, I don't have a suitable taken lens to test. I think this 46/2x needs 135mm or above to be able to eliminate vignetting.

I think if a lens is sharp, don't need to stop down. It is always sharp. I have OM 55 1.2 and 50 1.2. Both are sharper than Nikon Ais 50 1.2 at 1.2.

IMHO, flare does not related anamorphic ratio. It mainly depends on coating. Many 1.33x lenses (ie. Century's) have much better flare then 2x lenes (golden projection lenses). But for better oval bokeh, 2x lenses are the best. 1.7-1.9x lenses are just rare than 2x lenses. So they are more expensive. 1.5x lens is more close 1.33x lens than 2x lens. It is also quite expensive too.

I guess the Sun is same as Proskar lens. If true, to compare with ISCO integrated lens, the difference is rear mount size, and flare . But ISCO might be a little bit sharper, and less flare.

Generally, zoom lens has disadvantage, IMO. I used 70-210 with Elmoscope II on FF camera Need at least 100mm to get rid of vignettes. And at 210mm end, the IQ is poorer too. Usually, fixed focal prime lens filter thread size is smaller then zoom lens with the same aperture. Or other words, with the same size filter thread, prime lens has larger aperture to use.

Oh, I don't know there are different version. I thought pancake lens are E version. You are right. E version is AI lens. But I really mind radioactive lens, especially majority of Super-Takumar. And also yellowish is not good color too. I said OM 50 1.2 might be the only f1.2 lens with 49mm filter thread.

I would think OM lenses, 49mm front thread, even if 50 1.2, very sharp. Nikon 50 E 1.8 pancake lens is another consideration.

For this lens, I had little experience. If use suitable diopter, can get good IQ.

Later. No.

I like Moller now, better flare than Japanese lens, so just bought it today. http://www.ebay.ca/itm/351770424648

I just remembered similar saying before, so found it from this post.

IMO, bokeh should depend on your taking lens, all 2x Ana lens should be same. Another consideration is the view angle has little difference from each other ana lens. Btw, golden lenses are more currently made, multi-coating, has good sharpness, but lack of flare. So they are cheaper. Black lenses may have good flare.

How much is your budget? Is flare the important factor for your consideration?

16H/8Z coating might have different. But Elmoscope-II is exactly the same as B&H. As I said previously, if mounting the prime lens with front thread 49mm and smaller, or 58mm and bigger, there is no difference for both.