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11-05-2010, 07:56 PM   #1
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Will you consider slower lenses for your K5?

Just out of curiosity - for those with the new K5, or considering the K5 - will you now be considering glass that you might not have looked at before because of the greatly increased ISO and noise performance?

For example, I shoot a lot of dance performances in less than ideal light, so I've only considered zooms/primes (mostly zooms because you never know where you can end up in an auditorium) 2.8 or faster on my K10D. At times even that didn't work and I had to switch to my 77mm as the light was so bad.

So, while I would definitely not have considered the DA 17mm-70mm f/4 or DA 60-250mm f/4 previously on my (still working great) K10D - they might do a great job on the K5 in the exact same lighting situations, as long as I don't ming bumping the ISO past what the K10D could do??


11-05-2010, 08:08 PM   #2
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No. But I will be able to shoot at higher shutter speeds than I used to. Besides, faster lenses buy more than just speed. Quality of a typical 200/2.8 versus a typical 200/5.6 both used at f6.7, shallower DOF when needed and of course heavier so we keep in shape lugging it around.
11-05-2010, 08:23 PM   #3
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I've shot quite a few dance performances with the DA 17-70 and the K20d or K-x, so I'm already pretty comfortable shooting lenses with a max aperture of F4 indoors. Actually, it works pretty well on the K10d or k100d with a little pp. Pretty much once the sensors started turning in decent shots at ISO 800-1600, F4 works pretty well as a max.

So, no, I'm not buying lenses that are faster or slower based upon the camera body. I do appreciate the faster shutter speeds, though.
11-05-2010, 08:26 PM   #4
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No, my slower lenses will work better, but even after the reported "T" stop "issue" (too much light bounces off modern sensors), I can still crank the ISO AND open a F1.8 wide open for even more flexibility under extreme low light.

11-05-2010, 10:13 PM   #5
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Another no here.
11-05-2010, 10:24 PM   #6
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Doing that would, to me, feel a bit like putting cheap tires on your car because you just got a bigger, stronger engine.
11-05-2010, 10:29 PM   #7
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there are reasons why fast lenses were made, not just because of light transmission.
11-06-2010, 06:06 AM   #8
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It depends on your needs, your budget, and your subjects. And the lens, of course. The M42 Tele-Takumar 200/5.6 is small and VERY sharp, and can still be had for under US$50. The tiny Industar-50/3.5 goes for about half that. You might have noticed that fast glass (except Takumar 55's) tends to be big and expensive. And sometimes it's necessary.

For many static applications (macro, architecture, 'scape, formal portrait, etc) ultra-speed is irrelevant. Even for much (daylight) street-shooting, the old photojournalist's rule of f/8 and be there still applies. In some towns I'll use a Tokina 21/3.8 set to f/11, prefocused to 2m for DOF of 1m to infinity, the shutter on my K20D set to 1/100, and let ISO float.

Dynamic and low-light situations are different. That's why I regularly carry 16/2.8, 28/2.5, 50-55/1.4, 85/2, 135/2.5 lenses. But I also use the slower glass I mentioned above, and a 50-125/4.5 enlarger zoom, 50/4 macro, etc. If you want a minimal kit, get fast glass. If you want to accumulate some remarkable tools, CHEAP, add some well-chosen slower lenses.

11-06-2010, 06:29 AM   #9
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Will you consider slower lenses for your K5? Probably not.

Probably not, but I would be more comfortable stopping down an extra stop for more DOF (if desired) or bumping up the shutter speed a little and let the ISO drift a little higher than before (the K5).
11-06-2010, 06:51 AM   #10
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Les, Since I have the slow 70-300mm sigma , absolutely and i already tried it and allows me catch better moving subjects than with my K-7. I have to pushed the ISO a bit more to allow me use 1/500s or more (if the subject does not permit) of course it comes with little to noise to clean up just becoz ot that high-iso but you know K-5 has good DR and allow more acceptable pics at high iso.
Altho i know most of shooters(me2) preferred IQ which calls for faster/bigger lens. Got jealous with those shooters with deep pocket and can afford top of the line lenses.
I will use my slow lens for distant subject coz that's all i have.

11-06-2010, 06:51 AM   #11
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On the contrary, with the high ISO capability and resolving capability of the K-5, I for one will want to use nothing but the fastest lenses that I can get my hands on.
Firstly it helps a lot whether using AF or MF in low light shooting. Old slow lenses just can't keep up with the K-5 in terms of resolving capability imo.

Shot hand held under very dim street lighting at our Pentax Singapore user outing yesterday with the K-5 and A 50 mm f/1.2 (ISO 6400 1/50 sec at f/1.2)

11-06-2010, 07:08 AM   #12
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QuoteOriginally posted by Pentaxor Quote
there are reasons why fast lenses were made, not just because of light transmission.
The best summary in one line.

And, there are many reasons to shoot at a particular aperture besides needing it for enough light for an exposure.
11-06-2010, 07:10 AM   #13
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I don't know if I will go directly looking for slower lenses. But for some lenses like the DA15 f/4 and DA12-24 f/4 and DA21 f/3.2 that are very good even though they are kind of slow by modern standards, I think the K-5 opens up some new possibilities.
11-06-2010, 01:06 PM   #14
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Another no here. Even if I was to get K-5 (which won't happen anytime soon) I'll keep my fast glass. Shallow DOF can't be substituted by any ISO setting.
11-06-2010, 06:43 PM   #15
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Nope, the K-5 has ISO 80, that might even allow me to take the 50 f1.2 out during the day . As others have mentioned, faster glass generally has higher limits, and by in large are sharper when stopped down than glass that 'just' reaches a given aperture (Macros and the odd exception like the 50 f1.7 excluded).
Then you have the whole DOF question and the slow stuff is useless when you want to play with DOF.
What is classified as slow anyways these days? >f2.4?

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