IR-Cut filter

[artington]

I have a UV-IR Cut filter on a Zeiss ZM lens - is it likely to interfere with IQ on the NEX-7 if used instead of an ordinary UV filter?

[David Kilpatrick]

No. It's only likely to improve image quality by limited the range of actinic light transmitted, thereby making the lens slightly more apochromatic in practice.

That is, as long as it's a top grade UV-IR cut filter and not a Tiffen.

David

[artington]

Thanks for your helpful reply, David - and it's a B+W so quality shoukd be ok. Are Tiffen all that bad?

[David Kilpatrick]

Tiffen use the lowest cost filters they can get away with in my experience, and each different filter type can be a different 'grade' because they source from many places. B+W is guarantee of Schott glass, brass mount, top grade. Big difference.

David

[artington]

Great, thanks, David. I usually use B+W or Hoya but I do have one Tiffen.

All best

Martin