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12-13-2010, 03:44 AM   #1
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Help me get wide

So I really want to offload my kit lens. I don't use it much other than for it's 18mm wide range.

The lens I need most now is a dedicated wide angle.

Looking around I'm very interested in two lenses

the
SMC Pentax-A 20mm F2.8 and
the SMC Pentax-FA 20mm F2.8


Obviously I prefer the FA for the auto-focus, but I shoot mostly manual these days so I'd be happy with the Pentax-A two.

I'm pretty set on getting a prime, wide.

I've heard the saying that between good price, good quality and small size you can only have two.

I'm not interested in the DA21mm f3.2 because I want a lens I can use on my film bodies as well as DSLR.

I was hoping some of you can mention other good lenses around this focal length.


12-13-2010, 03:57 AM   #2
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How about the Zeiss ZK 21/2.8, the absolute best. Get it while you can.
12-13-2010, 04:47 AM   #3
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QuoteOriginally posted by wlachan Quote
How about the Zeiss ZK 21/2.8, the absolute best. Get it while you can.
very nice, but a little above my budget
12-13-2010, 10:12 PM   #4
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A Tokina-made M42 21/3.8 is widely available, badged as Vivitar or Lentar or Soligor or Porst or whatever. Mine cost US$23 a couple years ago. I often see these for well under US$100 on eBay. Most commonly, I stop it down to f/11 and prefocus to 2m, for DOF from 1m to infinity.

I *would* suggest that you stop your 18-55mm down to f/8 or f/11 for similar usage. But you want to 'upgrade', so go ahead and spend cash. Yes indeed, buy a new Pentax lens or three. Keep everyone in the supply chain happy. What the hell, it's only money.

12-14-2010, 07:01 AM   #5
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QuoteOriginally posted by dj_saunter Quote
So I really want to offload my kit lens. I don't use it much other than for it's 18mm wide range.

I'm not interested in the DA21mm f3.2 because I want a lens I can use on my film bodies as well as DSLR.

I was hoping some of you can mention other good lenses around this focal length.
QuoteOriginally posted by RioRico Quote
I *would* suggest that you stop your 18-55mm down to f/8 or f/11 for similar usage. But you want to 'upgrade', so go ahead and spend cash. Yes indeed, buy a new Pentax lens or three. Keep everyone in the supply chain happy. What the hell, it's only money.
The OP clearly wants a lens to use on a film and digital body and pretty much uses the kit lens as a prime anyway, so this hardly seems like an upgrade just for the sake of upgrading.

I've never used it, but there's this AF option from Sigma (20mm f/1.8):
https://www.pentaxforums.com/userreviews/Sigma-20mm-F1.8-EX-DG-ASPHERICAL-RF-...or-Pentax.html
12-14-2010, 09:50 AM   #6
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My most used wide angle on film is the M20/4, mainly because it gave me WA coverage I did not have on a DSLR before I bought the DA12-24. It is still a great option. Had I not had an M20, I probably would have gone for the Voigtlander 20mm Color Skopar. They are a little pricey now that they are harder to find.
12-14-2010, 11:20 AM   #7
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QuoteOriginally posted by PrimeObjectif Quote
The OP clearly wants a lens to use on a film and digital body and pretty much uses the kit lens as a prime anyway, so this hardly seems like an upgrade just for the sake of upgrading.
And thus I suggested the Tokina-made 21/3.8, which on my film bodies is WIDE! Mine just about lives full-time on my ZX-M, sharing it with the fishy Zenitar 16/2.8.

I haven't owned/used other rectilinear glass wider than 24mm so I can't comment on other candidates. But I can compute: fast wide FF glass = mucho dinero. Manual FF primes in the 20mm neighborhood aren't real common. I prefer lo-budget solutions. Thus the Tokina.

EDIT: Oh yes, the other way to get wide: Eat much candy, fried mozzarella strips, hamburgers, etc. Urp.

Last edited by RioRico; 12-14-2010 at 11:56 AM.
12-14-2010, 05:55 PM   #8
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QuoteOriginally posted by RioRico Quote
EDIT: Oh yes, the other way to get wide: Eat much candy, fried mozzarella strips, hamburgers, etc. Urp.
Hey, I'm 3 for 3 today! Woohoo!

I'll vote for a manual fisheye like the Zenitar that RioRico mentioned. It's full-frame (film) compatible, VERY wide, f/2.8, and inexpensive. And if you stop it down to like f/8, you don't really need to worry about focusing at all.

Of course, it's fishy too, but you can defish it pretty easily in software and get a still-very-wide rectilinear result at the cost of some reduced resolution in the corners.

12-14-2010, 07:39 PM   #9
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The Tak 28mm 3.5 takes some fine shots. However, I continue to be in love with my DA 12-24 and use that for the vast majority of my landscape shots.
12-14-2010, 09:44 PM   #10
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The Tokina 17mm F3.5 and rebadged vivitar 17mm f3.5 have piqued my interest.

Kicking myself for having let that one on the marketplace here go.

But I hadn't chosen what I want.


I have a question.

I'm getting a bit confused on fullframe and cropped frame focal distance.

My Pentax-A 35-105mm f3.5 on K10D is like a 45-135mm lens.

And the Tamron 20mm f3.5 acts like a 20mm on film and a 26mm on K10D

Does this mean that my sigma 30mm f1.4 is 30mm on cropped sensor and acts like a 22mm on film? (I can't use it, because of the severe vignetting).

And the 18-55 ALII kit lens acts like approximately a 12-35mm lens?
12-14-2010, 10:21 PM   #11
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All of the spec numbers (printed on the lens) are full frame (35mm) focal lengths. And you just multiply that number by 1.5 to get the digital (cropped) equivalent. It doesn't matter if it was made for digital or not.

17mm = 25.5mm on digital
35-105 = 51.5-157.5mm
18-55mm = 27-82.5mm on digital
30mm = 45mm
12-14-2010, 10:47 PM   #12
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LOL at the title of this thread. Maybe go on a diet of Krispy Kremes?
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