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09-28-2016, 01:01 PM   #1
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Pentax HD 20-40 Ltd filter size issue

My new lens arrived. Filter size is supposed to be 55mm, but even a 49 mm filter is too big. I've already returned a different lens due to QC issues. Now what am I supposed to do?

09-28-2016, 01:10 PM   #2
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Not sure what to say- the filter size is definitely 55mm if you want to fit it between the hood and lens. Note that this isn't a particularly common size, with more filters being 58mm or 52mm.

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09-28-2016, 01:10 PM - 1 Like   #3
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I have this lens... yes, the filter size is 55mm how is it possible that a 49mm filter is already too big, just curious? Can you show a picture of it when you try to fit a 49mm filter? If you mount the filter, it has to be mounted first before putting the lens hood on. FYI... I don't use filters for my lens.
09-28-2016, 01:21 PM   #4
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QuoteOriginally posted by aleonx3 Quote
I have this lens... yes, the filter size is 55mm how is it possible that a 49mm filter is already too big, just curious? Can you show a picture of it when you try to fit a 49mm filter? If you mount the filter, it has to be mounted first before putting the lens hood on. FYI... I don't use filters for my lens.
Oh... I feel sheepish...

One more issue, though... the camera reads the widest aperture as 3.5, or either the aperture isn't opening up completely. ??

09-28-2016, 01:25 PM   #5
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QuoteOriginally posted by dcsorrell Quote
Oh... I feel sheepish...

One more issue, though... the camera reads the widest aperture as 3.5, or either the aperture isn't opening up completely. ??
It's a variable aperture lens, it will only be f2.8 at 20mm to somewhere around 25mm I think.
09-28-2016, 01:26 PM   #6
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Never mind; I figured it out. User error. (No more drama, I promise!)

---------- Post added 09-28-16 at 01:28 PM ----------

QuoteOriginally posted by Kevin B123 Quote
It's a variable aperture lens, it will only be f2.8 at 20mm to somewhere around 25mm I think.
Thanks..(sheepish again.... Baaa...)
09-28-2016, 02:49 PM   #7
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On the subject of filters for the 20-40, I use a 67mm step up ring that lets me use 67mm filters for both the 20-40 and the 60-250mm.
09-28-2016, 04:08 PM   #8
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I'm another one who doesn't use filters on any lens, including the 20-40...

09-28-2016, 06:17 PM   #9
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I about can't live without my polarizer, but my UV is only for protection. I noticed today that my filter is much more dust resistant than the lens, as well.
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