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01-21-2015, 07:45 PM   #1
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DA25mm 645 lens Internal Filter options?

Hey guys and girls, just wondering if any of you have insights into using a Internal ND filter on the 25mm lens. If anyone could give me a link to where I can find some that would be great.

Thanks, Tom

01-21-2015, 10:01 PM   #2
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Any 40.5mm screw-in filter will work, such as this one:

Tiffen 40.5mm Neutral Density 0.9 Filter 405ND9 B&H Photo Video

Remember that every 0.3 neutral density equals 1 f stop.

Adam
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01-22-2015, 08:55 AM   #3
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I believe I have the same filter that Adam posted. Works fine. Takes a little time to change as you need to be more careful so as to not drop the filter holder or let anything get into the lens. Usually I just lay a lens cloth over the lens opening while I swap filters.
01-22-2015, 10:32 AM   #4
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Too bad there doesn't seem to be anyplace to order additional filter holders to make it quick and easy to change them out - Pentax/Richo has been no help, nor B&H, or anyone here when I asked about this several months ago. I tried to get a filter made by Sing-Ray, but they required me to send them one of the filter holders, which I could never buy anywhere. If someone here has a source to purchase one of these filter holders, please let me know. Thanks!

01-23-2015, 03:14 PM   #5
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in addition to the clear 40.5mm and C-PL that came with the lens, I also use a B+W F-PRO 10-stop ND
01-25-2015, 01:53 AM   #6
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I would also love to know a way to get hold of further examples of the filter holder. It would be much better to have the most frequently used filters ready loaded in those holders than fiddling around with large, clumsy hands in the half light as wonderful conditions change quickly...
03-31-2015, 09:58 PM   #7
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QuoteOriginally posted by mikeSF Quote
in addition to the clear 40.5mm and C-PL that came with the lens, I also use a B+W F-PRO 10-stop ND
Hey mike Im wondering what kind of long exposure time you can get from the above mentioned lens filter. Would it be good for architecture/ long exposure clouds?

Thanks mate.
03-31-2015, 10:26 PM   #8
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QuoteOriginally posted by Thomasbrowphoto Quote
Hey mike Im wondering what kind of long exposure time you can get from the above mentioned lens filter. Would it be good for architecture/ long exposure clouds?

Thanks mate.
its great for that.

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