Auto Focus Problem

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Blebo

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Name
Craig
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I think I know the answer but I'll ask just to be sure.

I was told when I first got my camera to get some cheap UV filters to protect the lenses from scratches and being bashed. However I have noticed that the camera isn't focusing to well especially the 300mm lens at full zoom. Can a cheap filter distort the light enough to cause issues.

I have done a few quick tests which seems to prove that the camera works better without the filters, but I cant be 100% due to camera shake etc.

Are filters needed to protect the lens or am I being over cautious

Thanks

Craig
 
The problem is you've bought cheap filters. You need high quality ones such as Hoya HMC ones.
 
I don't use filters,to protect my lens,what is the aperture of your lens at the 300mm end,as this can sometimes effect how fast your lens can focus :)
 
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