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04-30-2009, 06:36 AM   #1
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I'm lookin' for...

...28mm and 100mm prime lenses for wideangle and portrait work respectively. Can any of you guys reccommend some old excellent quality Pentax lenses?

Many thanks.

04-30-2009, 11:24 AM   #2
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Hi Mate

what is your budget and are you looking for more than one lens?



Cheers


Neil
04-30-2009, 11:26 AM   #3
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QuoteOriginally posted by paulyrichard Quote
...28mm and 100mm prime lenses for wideangle and portrait work respectively. Can any of you guys reccommend some old excellent quality Pentax lenses?
The M28/3.5, M28/2.8, and A28/2.8 are all widely available, inexpensive (usually well under $100 for the M's, around $100 for the A), and quite good. The K28/3.5, K30/2.8, A28/2, M28/2, and K28/2 are harder to find and more expensive, but most say they are better.

For 100's, the M100/2.8 is excellent and pretty cheap (around $100). The A version is the same optically but its "A" so it supports all exposure and flash modes. There are also 100/2.8 macros that are quite a bit more expensive.

Of course, on a K20D, 28mm isn't particularly wide and 100mm is on the long side for portraits, but these are still great lenses.
04-30-2009, 11:36 AM   #4
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I hear Vivitar made some 28mm lenses. One or two anyway.

I've got lots of samples hanging around including the latest in the thread First day out with Kiron 28/2.

04-30-2009, 12:03 PM   #5
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I like the Sigma 28mm f/2.8 "Mini-Wide II" right up until the sun starts to hit the front element and it flares badly. I do recommend the lens though if you can keep the sun from hiting it wrong... it's very sharp - even wide open.

This lens comes in "M" and "A" mounts so if you like auto exposure modes you'll want to make sure your're looking at an "A" version. Incidentally, the copy of this lens that I used to own is for sale in the Marketplace right now - the seller lists sales to the US only, but maybe you can change his mind. I've put some sample photos in that sale thread with links to full size samples should you care to pixel peep.

For 100mm I can only directly recommend the Tamron 90mm Macro. I have the new AF version and love it! There's someone selling the 90mm f/2.5 version in the marketplace right now and I hear good things about that too. This lens is so often praised for portrait work that Tamron has dedicated a special page on it's site to: The Portrait Macro...
04-30-2009, 12:39 PM   #6
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QuoteOriginally posted by nulla Quote
Hi Mate

what is your budget and are you looking for more than one lens?



Cheers


Neil
Neil, I don't mind spendin' money on somethin' that is of quality.

Thanks guys, I will look into every lens you've suggested. What lens do I need to go for if I want true 24mm and 90 or 100mm?
04-30-2009, 12:55 PM   #7
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QuoteOriginally posted by paulyrichard Quote
What lens do I need to go for if I want true 24mm and 90 or 100mm?
Sorry, I don't understand what you're asking here - are you referring to the 1.5x crop factor caused by the APS-C sensor in Pentax DSLRs? If so, keep in mind that this applies to all lenses whether they were originally designed for 35mm use or if they were designed for APS-C... So a 28mm is allways 28mm, but it will have the field of view on a Pentax DSLR that a 42mm lens would have on a full frame 35mm camera. If that's what you mean - good, if not, try to restate (or maybe someone else here will get it and make me look dumb ).

Also, you now mention 24mm... Typo? - if you're looking at 24mm lenses, you can change my response to include the 24mm Sigma Super-Wide II which is the shorter brother to the 28mm lens I mentioned but shares it's traits (sharp but prone to flare).
04-30-2009, 11:40 PM   #8
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...and you can also add the Pentax A24/2.8.

If by "true" you mean, the same field of view such a lens would have had on 35mm film, then use the crop factor in reverse (ie, divide by 1.5). That is, to get the same field of view a 28mm lens had on film, you'd need about 18mm on digital. And to get the same field of view of a 100mm on film, you'd need about 66mm on digital.

Since your 16-45 already covers that 18mm focal length (and the 28mm focal length, FWIW) very well, and you don't normall *need* apertures greater than f/4 for the types of applications wide angle lenses tend to be used for, I wouldn't be in a hurry there to be buying wide primes. But a real portrait lens could certainly come in handy. Unfortunately, there's kind of a gap between the 50/55 focal length and 85 when looking at older lenses. In order to come close to 66mm, your best bet is the DA70 - not an older lens. The FA77 is the next closest and is of course praised by many as the best portrait lens for APS-C.

05-01-2009, 12:51 AM   #9
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Sorry Josh, I got 24mm on the brain.

Thanks for the help guys. Thanks for the heads up on the FA77, Marc. I bet this lens is a rarity, huh?!
If not i'll try and bag me one.
05-01-2009, 03:20 AM   #10
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I agree as well with Marcs suggestion the FA 77 limited.

This lens should not be hard to find, used or new.

It is a really brilliant lens. Once you get one limited you will be hooked.

I have 2, the FA77 and the newly aquired FA 31 which has not come off the camera since it arrived... Paul read the reviews section for more info and praises on the 77

https://www.pentaxforums.com/lensreviews/showproduct.php?product=191&cat=30

Neil
05-01-2009, 11:36 AM   #11
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Both the FA77 and DA70 are in production and easy to find - the DA70 rather cheaper. Both are great lenses, very similar in many ways. FA77 is a stop faster, DA70 is smaller/lighter and has better corner sharpness, plus quick-shift focus override.
05-01-2009, 03:33 PM   #12
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Paul, there is quite a few shops in central London stocking FA77. But your best bet on any new lens would be srsmicrosystems.co.uk, they have shop up in Rayners lane, so if you don't feel comfortable with ordering online (excellent service though), you can make a trip...

good luck

PS: I think DA70 or FA77 will satisfy your needs for around 100mm FOV lens, but you're going to have harder time to get 24mm equivalent, good luck again

BR
05-01-2009, 04:07 PM   #13
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QuoteOriginally posted by paulyrichard Quote
Neil, I don't mind spendin' money on somethin' that is of quality.

Thanks guys, I will look into every lens you've suggested. What lens do I need to go for if I want true 24mm and 90 or 100mm?
Do you need 24mm in APS-C term or in actual 35mm term?

For me, the best 24 mm is FA*24mm/2 if you can find one though.
I have it and it's my best wide angle prime lens.
Not even the Limited can match the contrast of this lens.

For th 90-100 mm area mostly covered by macro lenses.
It's hard to say but like others have said, the closest available one is FA 77mm Limited.
Or if you can find one is the legendary A* or FA* version or Pentax 85mm/1.4

I think Tamron 90mm/2.8 macro would be the best for third party portrait lens (in 90-100mm area) and you'll get the excellent macro too.
05-01-2009, 04:53 PM   #14
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Sigma 24mm f2.8 Super Wide II

PentaxForums.com Third-Party Pentax Lens Review Database - 24mm f2.8 Super Wide II
05-01-2009, 11:58 PM   #15
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If you want a lens with same FOV as a 24mm lens has on film, that would require a 16mm lens on APS-C. The only one I know of is a fisheye, but there is the new DA15 that is only slightly wider. There are also older 18mm lenses that on APS-C are more or less similar to what 28mm was on film. The DA21 is worth considering, but it's more the equivalent of 31mm on film - noticeably not as wide.
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