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01-15-2014, 12:43 PM   #1
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Using 58mm filters on DA 20-40

Hi everyone. Here is an idea for using 58mm filters on the new DA 20-40mm limited lens. We came up with a lightweight traveling kit that used only 58mm filters but covered all out needs. One lens(the really wide ones) would not have filters because by design they don't have filter threads(I know something could be rigged, but that is not the point here). The second objective is the 20-40 lens hood kept falling off, so it was replaced with an 82mm snap on cap over the new hood. So the parts consist of--55-58mm ring, 58mm filter, UWA 58mm hood, 82mm lens cap. The benefit is a much deeper hood that still does not cut into the picture, and the common 58mm filter size. I know that this makes the lens bigger, and some might not like that. Our kit consists of: 13mm Vivitar(Rokinon 14mm in a different housing), 20-40 DA, 55mm DA*, 55-300 WR. Sometimes the UWA would be the 8-16mm sigma, and for really lightweight times the 31mm FA might be paired with the 20-40 only. All lenses except the UWA's use the 58mm filter size. Here are pics of the lens with the mentioned changes:

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01-15-2014, 12:56 PM   #2
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That looks like a much better hood than the elegant (but tiny) OEM one!

Adam
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01-15-2014, 01:00 PM   #3
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Thanks Adam! That means a lot coming from you.

David
01-15-2014, 01:11 PM   #4
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I was wondering what others were doing.

Thanks for this post. I was going to post this question because I was curious how others who have the lens were going to use filters. Have you had much time to experiment with your set up? I am curious as to whether the deeper hood has any impact on your images.

01-15-2014, 01:19 PM   #5
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We did this pretty much as soon as we got the lens(Karen kept popping off the stock cap) so I did not notice if it is better or worse than before. Seems to me it SHOULD be better.

David
01-15-2014, 01:22 PM   #6
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I find just the opposite with the lens cap. It takes a concerted (though reasonable effort) to get it off. Where did you pick up the lens hood? I'm looking at B&H right now.
01-15-2014, 01:29 PM   #7
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On ebay. The seller goofed and said the cap size was 67mm, but turned out to be 82mm. Thats fine as I have a 82 mm polarizer I bought years ago that fits right into the front of it if I want to go that route.

David
01-15-2014, 01:30 PM   #8
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Remember to get a 55-58 ring if you want to change the filter, then a 58mm hood for over that.

05-25-2014, 03:39 PM   #9
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Thanks David&karen for sharing the idea.
I have the 20-40 and don't feel confident with the original felted cap. Apart from a generic 58mm "click" cap with a string (which require to leave the hood at home), I've tried the 20-40 hood on + 62mm "click" lens cap (specifically the Pentax 18-135 one): it seems to fit perfectly size wise, but can't grip enough to the hood, so it falls easily.

Do anyone know a cap type or brand that will get good grip on the 62mm 20-40's pentax hood?
Thank you very much!
05-25-2014, 05:23 PM   #10
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Interesting setup.

However, it does give the little in-lens motor a lot more hardware to move around.
After the reputation of the previous generation of Pentax in-lens motors,
I don't think I'll be trying this myself.
05-25-2014, 06:15 PM   #11
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It's less than an ounce different, so I don't think it's an issue.
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