The Filters We Need With Digital...

Started Oct 5, 2008 | Discussions thread
Iliah Borg Forum Pro • Posts: 22,456
Re: The "negative SA" theory gathers strength...

Joseph S Wisniewski wrote:

Iliah Borg wrote:

Joseph S Wisniewski wrote:

Iliah Borg wrote:

I have just bought a
Tamron SP 300mm f2.8 LD IF and while searching for sites with more
info about it I came across a lens test with a remarkable
finding...As you probably know, Tamron used to offer an optional
112mm "normal" filter for the front of the lens. I dont know what a
"normal" filter is but apparently the tester has found his Tamron
300/2.8 to be considerably sharper with this filter on the lens than
without it!!!

I had a similar experience with Canon 1D MkII and long lenses. A UV
filter improved AF performance of the camera.

Iliah, that is just plain weird.

Can't agree more.

But I have a possible explanation

I was reacting more to the "plain" then to the "weird" part

Do you remember what aperture you shot your test at?

f/4

p.s. when you made your monochrome D2X, did you recycle the original
cover glass?

Used it to replace a broken one on another camera.

And I wonder if lens makers have been designing lenses for proper
compensation with a filter in front of the lens and nothing behind
(that's the way we usually shot B&W film and early color film), and
if they're now adding any compensation for all the stuff in front of
the sensors with this "designed for digital" movement.

That is my belief too. I will have an opportunity to ask a direct question.

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