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04-29-2011, 07:48 PM   #1
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been playin with a canon 5d

Believe it or not, this is actually a question.

Ok... Don't tell my k20d but I've been cheating on it with a Canon 5d. Not the mark ll, but the old straight up 5d. I hate to say it but I love the canon. I hate navigating the menus as all I've ever had is a Pentax but other then that, for a 5+ year old body it's pretty nice. Now for a little back story.

I own a K20d. I also own a K10 and a K100 bouncing around somewhere. My best glass, the... sdm 50-135 2.8. The rest of my lenses are old manual glass. The kit lens, a 50 1.4, 50 4.0 macro, 200 4.0, a third party 24 2.8, etc.

So, Now I get to borrow my brothers Canon 5d with a 16-35l lens. With my K20d I'm getting 5 or 6(total guess) keepers for every 20 shots. With this old ass 5d, I'm at 15/20(pretty damn accurate) if not closer to 19/20. I only do center point focus and shoot manual. It just seems to me that with this 5d I'm getting the shot I want almost every time. Focus where I want... Sharp...

So, now I'm home and importing to lightroom. colors suck compared to K20d +sdm 50-135. But more then half of k20d's pics from same event were unusable because they were out of focus. I can lightroom the canon pics to look fine.

Finally... The question.

The glass I'm using on the 5d is a 2000.00+ lens new, 1500.00 used. Is it just the glass? Has anyone shot both this canon lens and the Pentax 12-24 or sdm 16-50? I love this focal length as I like shooting architecture, landscape, close quarters bar/club shots. Would a k-5 and a 16-50 or a 12-24 give me close to the same feel as I get using this 5d and the 16-35l? Say yes and I upgrade. Just kidding but maybe not.


This isn't a "i'm moving to Canon/Nikon threat thread." I love my K20d and I'm to poor to move even if I wanted to.

04-29-2011, 08:30 PM   #2
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The K20 with the 50-135 is the 35mm format equivalent of 75-202mm. You can't compare the keeper rate between 16mm and 200mm. DoF is much narrower and the effect of camera shake is greatly magnified.

Try this again with the pentax 12-24 on your K20. I'll bet you 10 to 1 your keeper count goes up three-fold.


Hay, I used to live in Ann Arbor!
04-29-2011, 09:16 PM   #3
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QuoteOriginally posted by RXrenesis8 Quote
Try this again with the pentax 12-24 on your K20. I'll bet you 10 to 1 your keeper count goes up three-fold.


Hay, I used to live in Ann Arbor!

I can only offer my opinion without any real concrete experience since I only have the k-7 and 50-135mm and my friends (two of them) have the 5D and 5DMK II, they both have the 24-105L IS lens.

I agree with the above comment about shorten focal length, much easier to achieve focus... and the 12-14mm is also very sharp wide-open. My keeper rate for the 12-24mm is almost 100% and of course I use flash if I am indoor.

When comparing shots using my k-7 and 50-135mm, my keep ration is also very high with dead on focus. While my friends combo are much softer than mine; however, I would have to think that they use auto focus point-select whereas I use exclusive use user-select focus point. This is probably not a very good indication of 5D/24-150L not being able to get sharp focus pictures, but rather user skills. The other point I noticed that color from the Canon are way-off as well, again, another user configuration/usage. I do however, noticed that you mentioned the 16-35L; I believe that is likely a lot better lens that the 24-105L f4. So, my feeling is that you find fast focus and accuracy on the 5D combo to be more to do with the superb lens.
04-30-2011, 04:18 AM   #4
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Thanks for the replies. I think it's time to rent a 16-50 or a 12-24 and do a real comparison with equal focal length and lens quality.

04-30-2011, 04:25 AM   #5
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It sounds like you like wider lenses, particularly if you were happy with a 16-35 on full frame. As the others said, look into something wide and see how you like it. Focus really shouldn't be much of an issue anyway at 12mm on APS-C. You can almost set it to hyperfocal and snap away.
04-30-2011, 05:42 AM   #6
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If you get 5-6 keepers out of 20 with your K20D, your camera, glass or technique must be off. I get near 100% sharp shots, and when I don't it's either a dying battery or user error. Composition hurts me much more than the gear.

Is your statistic obtained with MF glass?
04-30-2011, 07:05 AM   #7
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Have you done the focus calibration with the 50-135, kit lens etc.?
04-30-2011, 08:00 AM   #8
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QuoteOriginally posted by bdery Quote
If you get 5-6 keepers out of 20 with your K20D, your camera, glass or technique must be off.
+1 to this opinion. I mean K20+any SDM are not speed demon combo but unless you are shooting fast paced action you still should get more 25% shots in focus.

The other arguments are valid too. You can compare 16-35 on FF to 50-135 on APSC. Try 12-24 on your Pentax or 70-200 on 5D. It's much easier to misfocus longer lenses. If you'll miss focus with 12-24 on K20 in 14-15 shots out of 20 then it's definitely not the AF system to blame.

Last thing, if you are shooting fast paced action, then Canon will be better option. Their AF speed with USM lenses simply destroys Pentax's SDM

04-30-2011, 08:47 AM   #9
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I have to echo what others have said. If you are only getting a 25% keeper rate from your K20D, something is very wrong. With your K20D/50-135, did you have the SR turned on? SR is especially important in the telephoto focal range.

BTW, the 5D is an older generation camera, but so is the K20D. By some accounts, the current generation K-5 outperforms the current generation 5D-II.

Rob
04-30-2011, 10:04 AM   #10
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It very well could be technique. By no means do I consider myself a skilled photographer. Also, most of my issues with missed focus have always been during faster paced action.
04-30-2011, 10:37 AM   #11
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QuoteOriginally posted by TheOsOProject Quote
It very well could be technique. By no means do I consider myself a skilled photographer. Also, most of my issues with missed focus have always been during faster paced action.
With K10D, I sometimes noticed I can manual focus better in fast action than auto-focus (with an appropriate focusing screen, of course); also since I know where I want to focus, I don't really need to focus/recompose or do the guesswork related with where camera focus point is actually pointing. The problem with AF is not just accuracy - 50-135 focuses pretty slow.
05-01-2011, 06:58 AM   #12
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QuoteOriginally posted by pbo Quote
With K10D, I sometimes noticed I can manual focus better in fast action than auto-focus (with an appropriate focusing screen, of course); also since I know where I want to focus, I don't really need to focus/recompose or do the guesswork related with where camera focus point is actually pointing. The problem with AF is not just accuracy - 50-135 focuses pretty slow.
In some cases, manual focus works better, since you know which subject to focus on... and I generally find that anticipation is important to get the subject in focus. Here is an example of manual focus using Vivitar-200mm f3.5 T4 lens.

I am not sure about 50-135mm focuses slow; yes, perhaps comparing to another brand or perhaps due to longer focus throw. It is a trade-off for accuracy though IMHO.
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