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Eclair Cameras: Zeiss 11-110 T2.2 vs. Van Diemen 11.5-115 T2.3 vs. Optex 12-120

Considering that the Zeiss 11-110 T2.2 is based off of the Zeiss 10-100 T2 Mk. II with the 87mm front, my question is: is this "factory" lens accomplished through adding a piece of glass to the 10-100? My theory is that Zeiss added a 1.10X range extender. Why? Because of what I read at the filmcamerakit site regarding their conversion of the lens to 11.5-115 T2.3. This is what is stated at the site:

"The modification changes the focal length by a factor of 0.015x and adds approx 1/4 of a stop."

Actually, my understanding is it would be a 1.15X change, since this number times 10 gives you 11.5

1.15 * 10=11.5

Therefore, wouldn't it serve to reason that Optex is using a 1.20X converter considering that their lens becomes a 12-120 T2.4?

1.20 * 10=12

So, what I'm really asking is: is the VanDiemen 11.5-115 and the Optex 12-120 just as good as the factory Zeiss 11-110, or am I grossly over simplifying? Somehow I fear the latter may be true, but wishful thinking and logic makes me want to believe that if a company could come up with a piece of glass that was 1.10X you could replicate the Zeiss 11-110 T2.2 without having to pay $9,500.00 or more. You can often find a Zeiss 10-100 Mark II for less than $3,000 on Ebay these days. The cost of the VanDiemen conversion is about $1,650.00. It would be great if you could pretty much get the same effect of the factory Zeiss 11-110 by spending only $4,650.00 as opposed to $9,500.00. Better yet, it would be great if someone could make a 1.10X extender to fit to the back of these lenses.

1.20X = 12-120 T2.4
1.15X = 11.5-115 T2.3
1.10X = 11-110 T2.2(???)

Mike Welle

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