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07-06-2012, 06:37 PM   #1
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Sigma 10-20mm f3.5 82mm filter options

I was just wondering about filter options for this lens. Will a standard 82mm filter work? I am looking for ND filters to fit this lens. Was going to get the Hitech 100mm filter system but not too keen on spending that much money on filters that I'll use on only 1 lens.

What I'm interested to know is, will the HOYA ND400 82mm filter fit on the lens without touching the font element? It looks like the lens sticks out slightly past the thread.

I was thinking of buying this filter unless there is something better quality out there:

http://www.ebay.com.au/itm/Brand-New-Kenko-82mm-82-mm-MC-ND400-Filter-ND-400...item4ab890f64f

EDIT: What is the difference between the HOYA and KENKO filters? http://www.ebay.com.au/itm/Hoya-HMC-49mm-ND-400-Neutral-Density-MC-AUTHORIZE...item4d029f0741


Last edited by CrazyNuts; 07-06-2012 at 07:05 PM.
07-06-2012, 09:38 PM   #2
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The In-Depth review of the UW lenses here on the forum says the following about the Sigma 10-20/3.5:
"The front element uses an 82mm filter. However, if you use a filter be sure to get an ultra-thin one to prevent vignetting which can occur at the 10mm zoom setting."

Sigma 10-20mm F3.5 vs F4.0-5.6 - Design and Handling - PentaxForums.com
07-07-2012, 12:03 AM   #3
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Thanks for the link Docrwm. Worst thing is there are no "ultra-thin" 82mm filters especially in ND-400. I'd be happy to be proved wrong.
07-07-2012, 12:20 AM   #4
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Might PM Adam and ask what filters they were referring to for the review.

07-07-2012, 05:01 AM   #5
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PM photomission, who was the author of the review.
07-07-2012, 05:50 AM   #6
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I have this lens - got a UV filter on it. The Hoya Pro1D thin/slim one which causes no apparent vignetting. (Also, there's no difference between Hoya and Kenko, same product - different name.)

That said, I don't think they produce thin variants of other filters. I have been intending on getting GND filters sometime in the future and am going to go the Cokin route - I don't think there's anything suitable for screw-on filters?
07-07-2012, 03:38 PM   #7
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Yeah that's the issue I'm finding Vylen.

Think I'm going to have to invest in the Pentax 15mm prime and just get a 49mm ND filter that will suit all my other Pentax prime lenses.
07-07-2012, 05:03 PM   #8
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When I reviewed the lens I found that you had to be careful not to get vignetting when using filters. For example some polarizing filters are wider (thicker) that others. For example I have a 62mm that is 3/16 wide and I have slimline 77mm that is only 2/16 wide. B&W does have most of their filters available in a slim line mount but they are not cheap. The ND filters are over $100 dollars. In most situations you should be fine, 1/16 of an inch will probably not show up. The problem you can run into is when you stack filters, on most other lens it would be perfectly fine, but not on ultra-wide lens. I intentionally created vignetting by stacking a slimline and UV filter on a shot with the Pentax 12-24 (4/16), and the Sigma is wider. DA 12-24mm vs Sigma and Tamron 10-24mm Comparison - Image Quality: Vignetting - PentaxForums.com

07-07-2012, 05:08 PM   #9
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Thanks for your photomission.

Vignetting doesn't bother me TOO much as I can overcome that a little bit in Post Processing. The biggest concern I had was with the filters actually touching the front element. It looks like the filter wouldn't screw on all the way as the front element protrudes past the threat a little bit.

Is there any way you can confrim for me this won't be an issue?

None of my local suppliers have any 82mm ND 400 filters and it would have to be a special order. Would have to buy it and find out I can't use it.
07-07-2012, 05:20 PM   #10
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I can confirm a filter will fit on the lens. The front element does not protrude enough to interfere with the filter. Before you order the filter try to get the thickness dimensions. To minimize vignetting try to stay under 3/16 if you can.
07-07-2012, 05:30 PM   #11
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Thank you very much photomission. This at least alleviates my concerns.
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