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05-05-2012, 01:40 PM   #1
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18mm vs 15mm

When my son in law asked me to shoot his in home recording studio I had to use my DA 18-250 as it is the widest lens I have and the room is very small. Now it so happens that I want to buy the DA 15 Ltd for landscape and general work ( when Pentax comes up with some rebates to go along with the new high prices!). So as I was working I thought "I wish I had that 15mm right now, but later decided that for this situation it wouldn't make much difference. To those of you who have both, what do you say?

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05-05-2012, 02:10 PM   #2
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In this situation, I think a flash would improve the image a lot more than a wider lens.
05-05-2012, 02:12 PM   #3
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Yep, a bounced flash would improve the image...
Also, you can always do a little pano at 18mm and get the reach of a 15mm
05-05-2012, 02:17 PM   #4
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QuoteOriginally posted by GabrielFFontes Quote
Yep, a bounced flash would improve the image...
..said the guy with the bounced flash as his profile picture

05-05-2012, 02:20 PM   #5
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QuoteOriginally posted by kcobain1992 Quote
..said the guy with the bounced flash as his profile picture
hehe
05-05-2012, 02:24 PM   #6
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I guess they are correct, proper flash technique would indeed improve the feel of the shot, and also panning would help because you're not really capturing "motion" in this picture.

The lil DA15 is usually desired because of the sharpness it has across the frame(And not really the focal length itself), and also I believe that people also want it because it's wide enough and also would be great to capture motion(Because you don't have to pan).and it's so little that it's a crime not to carry it around with you.

(Also I didn't have the 18 - 250, but I compared the 18-55 vs the 15 and to be honest it's not that much, perhaps getting a 10 - 20 or 8 - 16 will make you happy, having a much more versatile focal length and all. )

What I meant in motion is "longer shutter speed" where you can convey motion vs stopping motion

But that's just an opinion from a newbie like me..
05-05-2012, 02:27 PM   #7
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Everything is static on the scene. How would a longer shutter speed give the sense of motion?
05-05-2012, 02:34 PM   #8
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"also panning would help because you're not really capturing "motion" in this picture."

I'm not talking about that scene, I'm talking about people wanting to acquire the DA15.

05-05-2012, 03:19 PM   #9
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I'm guessing you guys think the shot was too dark or muddy looking? Is this version any better? I can't help thinking that bounced flash would produce unwanted shadows and reflections plus drowning out all the colored lights. No? He wanted atmosphere rather than documentation I think.
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05-05-2012, 04:43 PM   #10
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I think it was pretty obvious why you didn't use flash. As for the 15mm vs 18mm, there is a big difference. You can, as suggested, stitch together a few shots and get a nice pano photo, or just buy the Sigma 10-20 and enjoy the view!
05-05-2012, 05:44 PM   #11
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An 18mm lens on an APS-C camera has a horizontal angle of view of 66 degrees. The 15mm lens goes to 76 degrees. It does add a lot.
05-06-2012, 04:50 AM   #12
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While the 15 mm will add some more reach at less distortion and better image quality, it can hardly be compared to the 18-250 mm lens. The 18-250 is an all in one lens, the 15 mm lens is a quite different design - fixed focal length, optimized to fit 49 mm filters, low distortion, ... the 15 mm lens makes sense if you carry it around with you, so as to replace the lower end of the 18-250 lens. Otherwise, the suggestion of an extreme wide angle zoom may be more useful.
In case you want to try panning, do not use the extreme of 18 mm, but maybe 28 mm adding multiple shots. At 28 you will less distrotion and better image quality (assuming a single shot cover floor to sealing.
05-06-2012, 06:08 AM   #13
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I think 18mm works well for this shot, and flash would obviously have been completely wrong. Maybe adding a little light on the guitars (but that's easily done with a normal lamp), and taking a shorter exposure as well to get the screen images darker might be nice. (I you feel like messing with blending images.)

Of course this shot could easily have been cropped from the 15mm, and as such it would have been better because the sadness caused by using a super zoom would have been absent. (But that's all inside the photographer, the final image doesn't benefit.)
05-06-2012, 06:19 AM   #14
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Bounced flash would not produce unwanted shadows- by definition it produces even diffused light. However going for 'natural' light works well for atmosphere here, I agree. Re the 15mm, yes that would give a slightly wider view but not to the dramatic extent that a 10-20mm would. The 15mm is also not 'sharp across the frame' at f4-f5.6, by the way! Very sharp centrally but trailing off noticeably towards the edges. It's a lens that 'wants' to be shot at f8, so not the awesomest for interior work.
05-06-2012, 11:31 AM   #15
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I want to thank all of you for your thoughts and opinions. Having several points of view is helpful and constructive criticism is welcome food for thought.
I have never tried stitching a pano but that could be a good project here.
I know there is a lot of love for the various wide zooms and I may well get one someday but I have developed a taste for primes. However there's not much to pick from in wide primes....14 and 15? I will continue to research this. The 15 will work for me I think ( I don't often shoot the interior of small rooms!) At $649.00 I will have to wistfully imagine having it on the K5 for the time being. I think it was 2007 that there was a rebate on the K-10 and at the same time I received an Amazon gift certificate...maybe I'll get lucky again, you never know.

Last edited by jaytee; 05-06-2012 at 11:35 AM. Reason: typo
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