--- "Schlake (William Colburn)" <[EMAIL PROTECTED]>
wrote:
> I have been lamenting how bright my B800s are. If I
> try to shoot a
> depth-of-field shot with my 50mm f/1.8, all I get is
> white. I have
> three ND filtes on order (the $10.50/per from
> Tiffen) in the three
> different densities. I already have a UV that I
> keep on so that I can
> clean my lens with anything if I lack my microfiber
> cloth, and if I add
> the ND that will make 2. I'm pretty sure that the
> 50mm can take two
> without a problem, but 3 would start being visible
> in the frame if I had
> a full frame camera. With the 1.6 crop factor, how
> many filters can I
> slap onto that lens before I start seeing them?
>
I suspect the answer is quite a few, given the
cropping factor. But the real answer is: try it and
see. With digital, it doesn't cost you anything.
But there's an issue beyond cropping. Every air to
glass surface you add increases reflection and light
loss, potentially reducing contrast. And filters
aren't optically perfect, so the more filter you stack
the greater the change for other types of image
degradation. Personally, I'd take off the UV before
putting on an ND. And use a darker ND before stacking
2 lighter ones. Stack filters only as a last resort.
=====
Bob Meyer
I don't suffer from insanity... I enjoy every minute of it.
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