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stacked filters, high iso, noise and soft pictures
I feel more than a little foolish admitting this, but I am trying to troubleshoot some very soft and noisy pictures I took on vacation last week with my d40x and 18-200vr (I am aware of the softness vs. versatility debate for that lens) with auto ISO..

What I did was stack my tiffen circular polarizer filter on top of my tiffen uv filter. I thought that at worst this would give me slight darkening and not significantly affect the image quality. Not long into my journey I found I could not separate the two filters. Only after returning to my camera store was I told to use one or the other, not both together. Could this be a reason so many of my pictures taken of static subjects in broad daylight show an 800 ISO and a lot of softness?..

Comments (6)

Yes. Each filter will reduce the definition by some percent. So softness will be the result. You may try unsharp mask filter in photoshop to improve sharpness..

Blimppilot2000 wrote:.

I feel more than a little foolish admitting this, but I am trying totroubleshoot some very soft and noisy pictures I took on vacationlast week with my d40x and 18-200vr (I am aware of the softness vs.versatility debate for that lens) with auto ISO..

What I did was stack my tiffen circular polarizer filter on top of mytiffen uv filter. I thought that at worst this would give me slightdarkening and not significantly affect the image quality. Not longinto my journey I found I could not separate the two filters. Onlyafter returning to my camera store was I told to use one or theother, not both together. Could this be a reason so many of mypictures taken of static subjects in broad daylight show an 800 ISOand a lot of softness?.

Keep smiling, Ajayhttp://picasaweb.google.com/ajay0612(Thanks for your precious time & invaluable comments)..

Comment #1

Your polarizer cost at least 2 stops so that may explain the higher than normal ISOs..

Question: When you found that the two were stuck together why didn't you just remove both?..

Comment #2

I recommend using filters only when needed. Especially to people who want perfect shots(color tones, detail). Filter reduces light, distorts (more or less)..

I use CPL filters (during travel or at macro) only when needed. Sometimes at sunsets and sunrises I add ND Grads too..

Http://www.stan-pustylnik.smugmug.com..

Comment #3

Good questionI thought using the lens without any filter was a no-no...

Comment #4

Thanks for the tiplooks like I've got some work to do in photoshop...

Comment #5

Not in my books. I have never scratched a lens in forty years and I only rarely but filter on my lenses. I use a filter only when I have a specific purpose in mind...

Comment #6

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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