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11-11-2010, 06:53 PM   #1
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Filter size for 21mm f3.2 -- 43 or 49?

I am buying a 21mm f3.2 and the pentax site says it accepts 43 or 49 mm filters. Can anyone with experience with this lens please explain how this lens can use either size, and please comment on which you prefer. Many thanks,

11-11-2010, 07:01 PM   #2
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The unadapted filter diameter is in fact 49mm: SMC Pentax-DA 21mm F3.2 Limited Lens Reviews - Pentax Lens Review Database

So that's what you want to get. AFAIK, there are no K-mount Pentax lenses with a smaller native thread. It's also the most common filter size for Pentax lenses.

I think that with the hood you can use 43mm filters.

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11-11-2010, 07:08 PM   #3
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The DA21 can take both sizes, however with a 49mm filter the hood cannot be used, with a 43mm filter the hood can be used. The 43mm filter screws in under the hood, the 49mm blocks the hood.

Which size to buy then depends on whether you need to use the hood or not. If you don't care about using a hood, buy the 49mm, if you do then you have no choice but to buy a 43mm.
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