Filter on hood or lens?

user440 · 05-29-2008, 05:50 PM

I originally appended this question in another thread and never received any input. Trying here.

One of my lens' have a metal hood which is capable of using a filter (threads). For ease of installation / removal, I would like to be able to put a polarizing filter on the end of the hood rather than in between the lens and the hood.

What if any negative effect would this have?

Thanks!

Ed in GA · 05-29-2008, 06:36 PM

Originally posted by user440

I originally appended this question in another thread and never received any input. Trying here.

One of my lens' have a metal hood which is capable of using a filter (threads). For ease of installation / removal, I would like to be able to put a polarizing filter on the end of the hood rather than in between the lens and the hood.

What if any negative effect would this have?

Thanks!

IMO, it should not have any negative effect at all since the space between the lens and the Polarizer will not have light in it. The only effect it will have is the you will lose around 1 stop of light.

Others may have differing opinions.

Ed

christinelandon · 05-29-2008, 08:05 PM

I used to use a polarizer on the end of a cylindrical N***n (ahem!) hood; it worked without problems. The light loss (as Ed mentioned) was about 1 to 1 1/2 stops, due entirely to the polarizer. It would be the same if it were mounted between the lens and the hood.

**ChipB** · 05-30-2008, 12:45 PM

Only problem I can think of is the possibility of vignetting - would depend on whether your lens hood was a straight one or a "v" shaped one. I'd think it would be much more likely if the hood were straight.

Nesster · 05-30-2008, 12:55 PM

The other risk from mounting a filter at the bright end of a hood rather than the dark: the filter surface will pick up more glare and so possibly reduce contrast (or even introduce ghost images, esp. at night, reflected onto the flat filter glass).

SpecialK · 05-30-2008, 09:12 PM

The further away the filter is, the more it will become part of the subject, though at this small distance it should be negligible - if it is clean...

05-29-2008, 05:50 PM	#1
user440 Veteran Member Join Date: Jan 2007 Location: St. Louis, MO Photos: Gallery Posts: 349	Filter on hood or lens? I originally appended this question in another thread and never received any input. Trying here. One of my lens' have a metal hood which is capable of using a filter (threads). For ease of installation / removal, I would like to be able to put a polarizing filter on the end of the hood rather than in between the lens and the hood. What if any negative effect would this have? Thanks!

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05-29-2008, 06:36 PM	#2
Ed in GA Guest	Originally posted by user440 I originally appended this question in another thread and never received any input. Trying here. One of my lens' have a metal hood which is capable of using a filter (threads). For ease of installation / removal, I would like to be able to put a polarizing filter on the end of the hood rather than in between the lens and the hood. What if any negative effect would this have? Thanks! IMO, it should not have any negative effect at all since the space between the lens and the Polarizer will not have light in it. The only effect it will have is the you will lose around 1 stop of light. Others may have differing opinions. Ed

05-29-2008, 08:05 PM	#3
christinelandon Veteran Member Join Date: Jan 2008 Location: Seattle, Washington, USA Photos: Gallery Posts: 812	I used to use a polarizer on the end of a cylindrical N***n (ahem!) hood; it worked without problems. The light loss (as Ed mentioned) was about 1 to 1 1/2 stops, due entirely to the polarizer. It would be the same if it were mounted between the lens and the hood.

05-30-2008, 12:45 PM	#4
ChipB Site Supporter Join Date: Nov 2007 Location: Eau Claire, WI Photos: Gallery \| Albums Posts: 2,717	Only problem I can think of is the possibility of vignetting - would depend on whether your lens hood was a straight one or a "v" shaped one. I'd think it would be much more likely if the hood were straight.

05-30-2008, 12:55 PM	#5
Nesster Veteran Member Join Date: Oct 2006 Location: NJ USA Photos: Gallery Posts: 13,072	The other risk from mounting a filter at the bright end of a hood rather than the dark: the filter surface will pick up more glare and so possibly reduce contrast (or even introduce ghost images, esp. at night, reflected onto the flat filter glass).

05-30-2008, 09:12 PM	#6
SpecialK Pentaxian Join Date: Dec 2006 Location: So California Photos: Gallery Posts: 16,481	The further away the filter is, the more it will become part of the subject, though at this small distance it should be negligible - if it is clean...