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Old Sep 16, 2007, 7:18 AM   #1
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I am about to purchase an EF 400 L 5.6 lens. I have used filters with my others lenses with no problems. Does anyone have this lens and use a UV filter. Does this lens get affected by a filter? Just want to know before I order as I will buy a good filter for protection if there is little degradation as I feel safer that way considering where I take my lenses
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Old Sep 16, 2007, 3:39 PM   #2
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Vignetting is generally only a problem on wide angle lenses, not telephotos.

You do lose a bit of light so there might be a slight AF hit, but you generally operate in very bright conditions so I wouldn't expect any issues there either.

The DO lenses do exhibit severe issues, but that's the rather more expensive 400 f4.

Under the conditions that you use it, it makes a fair amount of sense to use one. (Though I probably still wouldn't bother except at the beach.)
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Old Sep 16, 2007, 4:52 PM   #3
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thanks:-)
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Old Sep 16, 2007, 10:31 PM   #4
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I have a 400 5.6 L and use a B+W 010 UV Haze filter. Auto focus is very fast and the lens with the filter is good and sharp. I shoot mostly outdoors. A couple of months ago I had a bad fall on some rocks. The 400 L was onthe camerawhich was around my neck. The lens hood saved the lens but another lens, a 70-200was in its soft case around my shoulder. The impact shattered the UV filter right through the case and lens cap but the front element of the lens was not even scratched. I consider the $80 a good investment.
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Old Sep 16, 2007, 11:19 PM   #5
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wow, that was lucky, Ive sticks and tree branchescome back at me into the 70-200 F4 and scratch a filter but always used it for protection. I will probably get one and see how the lens reacts. if all is OK it will stay on.
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Old Sep 17, 2007, 8:29 AM   #6
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Another use of filter that's really never reported is for condensation...

When you travel to hot and humid countries getting out from an A/C rooms (or vehicles) to the outside air usually frosted up the front element - Do this a couple of times and there'll be a thin film deposited behind the glass which you can wipe off if it is a filter since you can remove and clean its backside - If it's the lens eventually your contrast will suffer...
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Old Sep 17, 2007, 9:02 AM   #7
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NHL wrote:
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Another use of filter that's really never reported is for condensation...

When you travel to hot and humid countries getting out from an A/C rooms (or vehicles) to the outside air usually frosted up the front element - Do this a couple of times and there'll be a thin film deposited behind the glass which you can wipe off if it is a filter since you can remove and clean its backside - If it's the lens eventually your contrast will suffer...
well thats something Ive never thought of
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