Vintage Zeiss glass on modern cameras

So I don't understand why the flektogon f4 in the article is almost as bright as f1.4, and mine is darker than f4.

Are they not the same lens? They look identical based on the photo in the article.
 
hyalinejim said:
So I don't understand why the flektogon f4 in the article is almost as bright as f1.4, and mine is darker than f4.

Are they not the same lens? They look identical based on the photo in the article.
Click to expand...

Do you have the medium format Flektogon?

Frank
 
Yes, but if the glass has darkened (For whatever reason) then the T stop will have dropped, hence giving a darker image.
Dave
 
Hmmm.

First thing that comes to my mind is that f-stop and t-stop are two different things.
T-stop is the real ability to transform light. Thats why a 1.4 Nikon is faster than a 1.4 Noname.
Same f-stop, different t-stop.

Next thing is, these are no photos. The comparison pics are screen shots from my test clips. They where taken with a LEX 35mm adapter on a HVX 200. So we have more extra glass, a GG and more variables in the game.

Look at the comparsion pictures. The window is totally blown out with the Nikon, while on the Zeiss you can see the trees. So it is at least one stop.

Actually I don´t know what happened, but all of my vintage Zeiss lenses (I bought the whole set in mint condition from one guy - actually his widow)are way faster than the numbers say.

Frank
 
Postmaster, I found a couple good deals on the 50/4 but they have dust inside them. Do you know if it would be easy to get them cleaned? I know you shouldn't ever buy something needing to fix it but IMO the price is low enough that it would be worth it. Just curious if you knew...
 
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