Integrate a UV filter into your DA 21mm 3.2 LTD

Started Dec 29, 2012 | Discussions
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DAVID MANZE Veteran Member • Posts: 3,488
Integrate a UV filter into your DA 21mm 3.2 LTD

Prototype until I find a coated UV filter

Super happy with my replaced DA21mm 3.2 Ltd lens from Pentax (they tried to repair it and their lens testing jig refused to work so they kindly sent me an almost new copy FOC and it's spot on) It's a lovely lens, but one of it's shortfalls is that you cannot use a UV filter and a lens-hood at the same time.  So I decided to try to fit a filter in the lens-hood itself, I found an old 46mm skylight filter and measured the glass diameter,42.7mm, but the lens-hood needed a 42mm glass to fit neatly inside,out came the flat diamond file and lubricated with water I took off the offending 0.7mm and it slipped into the lens-hood nicely,four spots of superglue and it was good to go.

It's only a temporary job until I can find a decent coated UV filter, preferably a (45mm filter to save the hassle of diamond files and the risk of scratched coatings. I put a few drops of water on the filter so it's visible.

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citrontokyo Contributing Member • Posts: 812
Re: Integrate a UV filter into your DA 21mm 3.2 LTD

I find the 21, much like the DA 40mm with hood attached, is perfectly safe from bumps and scrapes, so I don't use anything with it. Just my opinion, but I don't want anything else, except maybe a polarizer or ND filter in front of that lens.

Still, that's a pretty neat trick you did.

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phil_t Forum Member • Posts: 72
Not to ruin anyone's fun...

But I have found that the B+W 43mm UV Haze SC 010 Filter (F-Pro Series), Mfr# 65-070074, fits the internal threads on the inside of the lens shade, while being thin enough to allow the shade's bayonet mount to engage.

No fitting or gluing required.

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DAVID MANZE OP Veteran Member • Posts: 3,488
Re: Not to ruin anyone's fun...

Hi Phil t,

OK, yes indeed there is an internal thread inside the lens-hood and the lens-hood is marked MH-RBA 43mm, so your call is a good one,does it not however, cause a bit of vignetting?there is not a lot of room for the frame.

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phil_t Forum Member • Posts: 72
Re: Not to ruin anyone's fun...

No, the filter ring is entirely outside of the rectangular shade opening, as well as being between the front element and the shade.

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Tyler Monson Senior Member • Posts: 1,452
Another Approach

My DA21 lens has been my daily companion since 2007—first on a K10, then K20, now K-5. Either around-my-neck, over-my-shoulder, or loose in the bag, I don't use any filter, but either the stock lens shade or, in foul weather, a 49-to-58mm step-up ring with an old Pentax 'normal' lens shade.

That shade (with step-up ring) is one-inch deep and I have no problem with vignetting.

Among the joys of the DA21 lens is the small diameter of the front element and its rather deep mounting. Both obviate the need for any protective (UV) filter, in my book (and, in the way-back, all of my Hasselblad lenses had OEM UV filters mounted).

Cheers,

Tyler

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DAVID MANZE OP Veteran Member • Posts: 3,488
Re: Just shows how many ways there are to skin a cat.

Hi,

Well ,we all have our own ideas and here it shows that we all achieve the same result differently!

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volosong Veteran Member • Posts: 4,313
Re: Not to ruin anyone's fun...

I've been using a Hoya Digital 43mm UV filter mounted on the internal threads since I first purchased my copy.  No vignetting, no adverse effects.

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Steven
GMT -8

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KentG Veteran Member • Posts: 4,285
Re: Just shows how many ways there are to skin a cat.

I assume you do know that a DSLR sensor does not need a UV filter like a film camera does? And you are using it as "protection" instead, I guess.

Kent Gittings

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DAVID MANZE OP Veteran Member • Posts: 3,488
Re: Just shows how many ways there are to skin a cat.

KentG wrote:

I assume you do know that a DSLR sensor does not need a UV filter like a film camera does? And you are using it as "protection" instead, I guess.

Kent Gittings

Correct!  It's for protection when I've the camera on my back while cycling!

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