Proxar F=1 Exposure Compansation Guide?

[carl chandler]

Hy there, I would like to know where I can find an Exposure

Compansation Guide for the Proxar F=1m Filter. I will be using it on

Hasselblad 500CM 80mm/2.8 T* Lens . Im new to Medium Format so

please, any input is greatly apreciated by me.

[Ed_Ingold]

Close-up lenses (diopters) do not require exposure compensation.

[carl chandler]

Thank you Edward for the answer, one more question. I also have a Hasselblad 50 2x Pola -1 (Polaricer) doe I have to use exposure compensation for it? If so where can i find a guide for it?

[Ed_Ingold]

The Polarizer has a compensation factor of 2x, or 1-stop. The actual factor varies depending on the subject and the rotation setting, but probably within 0.5 stop. For critical work with reversal film, you might bracket; but with negative film, it's usually not necessary.

[q.g._de_bakker]

Edward,<br><br>You wrote:<br><br><i>The Polarizer has a compensation factor of 2x, or 1-stop. The actual factor varies depending on the subject and the rotation setting, but probably within 0.5 stop.</i><br><br>That's not correct. Polarizer filters require an exposure compensation because when presented with "unpolarized" light they stop about half of it. No matter how the thing is rotated.<br><br>It is true that when presented with light some of which is polarized, it will hold back more, depending on how much of the light actually is polarized, and on the position of the filter.<br>But that is why you put such a filter on the lens to begin with, to stop that particular bit of light, leaving the "unpolarized" part unchanged (apart from the overal, fixed filter factor).<br>So you always use the same, fixed (!), compensation. It does not depend on the subject or how the filter is rotated.<br><br>Having said that, it is true that some scenes tend to go overall dull, lack lustre, and would look better when overexposed a bit. But that's because you shouldn't use a polarizer to record such scenes...