A quick question re filter on L glass

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magirus

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Hi all. I just got a Canon 24-105L USM IS lens. If I put a B&W standard UV filter on the lens (not the slim one) am I likely to get problems with vignetting? Thanks in advance for any advice.
 
Not if it is a crop-sensor camera. If it is full frame you MIGHT at the 24mm end but it is doubtful. On my 17-40L I start to get vignetting at somewhere around 20-22mm (or less from memory) with a standard B&W filter.
 
Hrm, I am sure I only have a standard UV on my 17-40mm, and don't get any vignetting, though do when I stack another filter on top (obviously, doh!, only did it once...)
 
I notice you both use full frame - so that probably answers the OP very well. Big fat no chance of a vignette on a crop camera and can probably stack two filters without issues too.
 
Oh yea, didn't see that he had a crop- yeap, was no problem at all on my 20D- including double stacking :) (same 17-40mm lens)
 
Standard practice to protect the front element. Some people keep a lens hood on all the time, others use a UV filter.
 
MG TF 135 said:
Standard practice to protect the front element. Some people keep a lens hood on all the time, others use a UV filter.
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Standard bad practise ;)
 
I'd always fit one to Expensive glass and in my opinion if you can see a substantial difference to image quality, buy a decent filter.

In fact a posting 'with & without' might be beneficial
 
Some like filters,some don`t.Surely the subject has thrashed,beaten and tortured to death?
 
ether said:
If you have to pay for your own glass makes sense to protect it
also makes it easier to clean
:thumbs:
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Who else do you think pays for my glass?
I do nto use filters after paying £1000 for glass why put a window in front of it.
Lens Hood will stop it getting knocked.
 
RichardtheSane said:
The practise of protecting your front element is actually rather good don't you think?

Even if you do disagree with some methods... :p :)
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Of course it's a good idea. That's one of the reasons I always use a lens hood, and take a bit of care.

rgrebby said:
why?
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There are loads of threads about this. Flare is the main problem.

POAH said:
not according to canon but hey what would they know
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What does Canon say?

If you google Canon Lens Work III you'll find section illustrating what happens with filters, specifically flat ones when used with digital - the sensor acts like a mirror, and the rear surface of the filter acts like another mirror, creating lovely ghost images and flare.

The protection glass fitted to the fornt of Canon's L primes is curved for this reason.
 
How about this

Some people like to use filters knowing they will sacrifice a little image quality on the way (More if they are poor filters).
Some people are happy with the hood for protection.

It is often a personal choice and neither way is any more right or wrong than the other. There will be a few folk who simply don't know how much a bad filter can shaft IQ, and they can be educated. But please, every thread where 'protection' filters are mentioned starts to degenerate into petty sniping pretty quick, as this one is.
 
A filter completes the weather sealing on a lot of 'L' lenses. I personally only fit one if I'm in a dusty or damp environment (A beach or any danger of water spray).




I can see this turning into a hood vs filter 'debate' but it doesn't answer the OP's question ;)

:)
 
some canon L lenses are not fully weather sealed without a filter, ,long canon teles outer element is for protection and a high quality filter does not affect IQ (or does not with my canon cameras 5D2 & 40D and L lenses). poor quality uncoated filters cause flare, ghosting and lack of contrast.

hoods are good but they don't stop everything.



HoppyUK said:
What does Canon say?

If you google Canon Lens Work III you'll find section illustrating what happens with filters, specifically flat ones when used with digital - the sensor acts like a mirror, and the rear surface of the filter acts like another mirror, creating lovely ghost images and flare.

The protection glass fitted to the fornt of Canon's L primes is curved for this reason.
Click to expand...
 
Thanks again everyone for your opinions. I didn't seek to ignite the pro/anti filter debate. I only wanted to know if fitting a B&W would cause vignetting on my lens. Now I know it wont I will fit a filter to protect the front of the lens.:)
 
NinetyEight said:
A filter completes the weather sealing on a lot of 'L' lenses. I personally only fit one if I'm in a dusty or damp environment (A beach or any danger of water spray).



:)
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Good point with regard to weather sealing. I remember my 17-40L was a lens that required a filter to be fully weather sealed.
 
Hi,

I don't use filters on any of my lens', all insured and I'd rather I didn't affect the image quality with a filter, plus a hood helps protect them too.

Mike.
 
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