DA 14 f2.8, DA 15 f4 or something else?


wadna

Link Posted 07/07/2012 - 06:47
For me it's an academic exercise at the moment but if you were in the market for a wide angle lens to fit a K-5 would you buy the DA14 f2.8, the DA15 f4 or something else?
DA14 is 1 stop faster & is slightly wider.
DA15 has better resolution figures, is smaller, lighter & cheaper.
Or, given that manual focus would not be so critical on these lenses because of their innate DOF particularly when stopped down a bit, would you suggest something else?
Thanks,
Ian.
Last Edited by wadna on 07/07/2012 - 06:55

aliengrove

Link Posted 07/07/2012 - 14:29
I can't comment on the DA 14, but I have a DA 15. Though not as wide as the Sigma 10-20mm, it gets a lot more use, primarily because it's so small. It's the one lens that I always have with me. It's also significantly sharper than the 10-20 imo, especially at the edges. It gives great results, and is also good for IR. I haven't found f4 a problem as I mainly use it for landscapes, IR or street photography.
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sterretje

Link Posted 07/07/2012 - 15:24
I think that it depends on the usage. My only need for an UWA will be architecture (and a very, very occasional landscape shot) and for that I prefer the flexibility of a zoom.

So DA12-24, Sigma 10-20 or similar for me; still deciding If you really want extreme, Sigma 8-16.
Pentax K10D + Vivitar 55/2.8 macro + Super Takumar 55/1.8 + SuperMultiCoated Takumar 85/1.8 + SuperMultiCoated Takumar 135/3.5 + SuperMultiCoated Takumar 200/4 + Super Takumar 300/4
Pentax K100D + DA18-55ALII + DA55-300
Pentax K5 + FA31Ltd + M50/1.7 + DFA100WR + M120/2.8 (+ DA18-55WR at occasion)

Pentaxophile

Link Posted 07/07/2012 - 16:30
For me the choice would be between the DA15mm, which is small and therefore always has that advantage over a zoom, and the 12-24mm (or similar UWA zoom), which isn't really that much bigger than the 14mm f2.8.

I don't think f2.8 is really that much of an advantage on a UWA. The DA15 has soft edges at f4 which could be an issue for some shots, but who uses a lens wide open expecting edge to edge sharpness.
[link=https://500px.com/will_brealey/[/link]

wadna

Link Posted 08/07/2012 - 00:21
Thanks all. I'm surprised no-one has suggested a manual focus prime lens.

Smeggypants

Link Posted 08/07/2012 - 00:47
I have a DA14 and love it to bits. The 2.8 is very handy for shallower DOF shots close up, and in fact has a closer focus distance. Can't comment on the DA15.
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283

wadna

Link Posted 08/07/2012 - 07:26
The availability of f2.8 is attractive to me for it's low light ability. I would have thought that DOF would be pretty wide at 14mm on an APS-C camera even at f2.8
Last Edited by wadna on 08/07/2012 - 07:26

Smeggypants

Link Posted 08/07/2012 - 08:17
wadna wrote:
The availability of f2.8 is attractive to me for it's low light ability. I would have thought that DOF would be pretty wide at 14mm on an APS-C camera even at f2.8

Not close up it isn't. It's no f/1.2 but it's nice and shallow.

Some DA14 pics here. Some of them are close ups

http://www.pentaxforums.com/forums/lens-clubs/117422-pentax-da14mm-club.html
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283

Smeggypants

Link Posted 08/07/2012 - 08:21
more DA14 pics here

http://poorfish.me/flickr/set.asp?id=72157606539215861
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283

wadna

Link Posted 08/07/2012 - 08:49
Impressive photos Smeggy.
I was surprised by the relatively shallow DOF in the mosque shot.
Thanks.

simonkit

Link Posted 08/07/2012 - 21:24
For me without doubt the DA12-24, I recently bought a DA15mm and whilst I liked the colour/contrast I was really disappointed by the soft corners - at all aperture settings on my copy

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Pentaxophile

Link Posted 08/07/2012 - 22:44
The first DA15mm I got was a shocker, very soft on one side in particular. The replacement they sent was a lot better but it has to be on f8 if the edges matter!

The lenses seem to have different strengths and weaknesses, but the 12-24mm does seem to have the best across-the-frame sharpness at a wider range of apertures.

(f4 bokeh on the DA15mm looks like this - http://farm5.static.flickr.com/4096/4820342318_e78e3e5665_z.jpg )
[link=https://500px.com/will_brealey/[/link]
Last Edited by Pentaxophile on 08/07/2012 - 22:49

Pentaxophile

Link Posted 08/07/2012 - 22:48
wadna wrote:
Thanks all. I'm surprised no-one has suggested a manual focus prime lens.

There's always the Samyang 14mm f2.8, a big heavy chunk but it looks very sharp (plenty of distortion though).
[link=https://500px.com/will_brealey/[/link]

wadna

Link Posted 09/07/2012 - 00:03
Thanks all.

McGregNi

Link Posted 09/07/2012 - 17:26
I would like to refer you to an earlier discussion that I started on this topic, following on from the suggestion of the Samyang 14mm. There were some good points made concerning the distortion issues. link

If value for money is an overiding factor (for me it is)then the Samyang remains a contender. I havn't put my 'money where my mouth is' yet - I'm trying to find anywhere that I can try out the lense on my K7 - but on balance, looking at the evidence in writing, the newer 2nd generation of this lense would be a nice bit of kit to have.
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Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
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