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Thread started 19 Apr 2007 (Thursday) 21:47
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Canon EF 50mm f/1.2L USM (2)

 
Mirrors_Edge
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Apr 26, 2015 05:37 |  #976

few shots from Mercedes-Benz Fashion week Sydney.

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IMAGE: http://41.media.tumblr.com/f28a9e0991cca4a171d967287badffa2/tumblr_nmup61D7qs1qfcje9o1_1280.jpg

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Canon 5D mark III, Canon 35L, Canon 50L, Canon 85L, HELIOS 44-3 58mm f/2.0 MC + Canon 600EX/ST-E3-RT
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Apr 26, 2015 11:57 |  #977

Stunning work, folks!

I am re-uniting with this favorite lens of mine..! Absolutely stoked.


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MatthewK
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Apr 26, 2015 17:28 |  #978

All of my lenses have different MFA values, and that doesn't matter since they are all within the "-20 to +20" range. If you have one outside of the adjustment range, then you worry, otherwise everything is just fine and nothing is wrong with your lens or camera.


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fordmondeo
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Apr 26, 2015 23:31 |  #979

Anyone finding the focus shift problematic?
I have found myself avoiding F2.0 to F2.8 as I don't know how to work around the problem.


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xpfloyd
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Apr 27, 2015 02:16 |  #980

I've tried to make the focus shift happen on purpose and can't seem to initiate it.

My main problem is that the lens is now dialled in at close distance. If I try and shoot something further away though its oof. I'm going to re-dottune at the weekend when I have more time. I must not have it correct yet. The sigma is getting more and more appealing


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Apr 27, 2015 03:16 |  #981

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Apr 27, 2015 04:47 |  #982

xpfloyd wrote in post #17533937 (external link)
I've tried to make the focus shift happen on purpose and can't seem to initiate it.

My main problem is that the lens is now dialled in at close distance. If I try and shoot something further away though its oof. I'm going to re-dottune at the weekend when I have more time. I must not have it correct yet. The sigma is getting more and more appealing

Please let me know how you get on with tuning?
It's only a real issue for me at close focus, by that I mean just beyond minimum focus distance.
At 1.2, to 1.8 it seems fine, At 2.0 to 2.8 the focus shifts further from the camera by about 12mm which is enough to render the image useless.
After about f4 the DOF is sufficient to disguise the problem.

I guess I'm happy that the focus is good wide open but having a dead spot in performance is a bit disappointing.


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Apr 27, 2015 11:58 |  #983

fordmondeo wrote in post #17534013 (external link)
Please let me know how you get on with tuning?
It's only a real issue for me at close focus, by that I mean just beyond minimum focus distance.
At 1.2, to 1.8 it seems fine, At 2.0 to 2.8 the focus shifts further from the camera by about 12mm which is enough to render the image useless.
After about f4 the DOF is sufficient to disguise the problem.

I guess I'm happy that the focus is good wide open but having a dead spot in performance is a bit disappointing.

Well, it's known that around F2-2.8, the lens will back-focus slightly. It's not the perfect work around and not 100% reliable. But if you're up close at near minimum focal length from your subject, and really need to shoot at those apertures, just focus and drift back slightly. :D Take it in burst too so at least one of them should be in decent focus.


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Apr 27, 2015 12:29 |  #984

jwcdds wrote in post #17534492 (external link)
Well, it's known that around F2-2.8, the lens will back-focus slightly. It's not the perfect work around and not 100% reliable. But if you're up close at near minimum focal length from your subject, and really need to shoot at those apertures, just focus and drift back slightly. :D Take it in burst too so at least one of them should be in decent focus.


This is exactly why I wish Canon would implement some type of MFA focus-bracketing in their higher-end bodies. They already have the firmware in place with the MFA adjustments, so how difficult could it be to allow the user to input a bracket shot count (just like exposure bracketing) and then a +/- MFA number to shoot in a burst? I'd love to have the ability to set the camera to shoot 5 frames, each adjusting 2 MFA pts forwards or backwards from the initially-locked-on point.

With the ridiculous burst rates on the 7DII, I could easily see myself using that capability nearly all the time with my wide primes - even for non-stationary objects (e.g. portraits.)


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Apr 27, 2015 13:52 as a reply to  @ fordmondeo's post |  #985

The focus shift won't happen if you use the center AF point to achieve lock. Also, if you want to use the outer points, try holding down the DOF Preview button and then AF'ing. Or use Live View (which isn't really all that practical haha).

Yeah, no amount of MFA will "fix" the shift, and it is silly that Canon hasn't been able to implement some kind of in-body compensation algorithm for individual lenses. I guess the narrow margin of error and varying degree of the curved focus plane on the 50L is too large to compensate for? Or it's a business tactic to keep everyone just frustrated enough so that when the new revision is released, it's a complete sales homerun when all of the angsty 50L owners clamor to get the "fixed" lens. /conspiracy

The first 50L I tried was at the same time I was regularly shooting an 85L, and needless to say I was appalled by the focus shift and the supposed lack of sharpness compared to the almighty one. So I returned it, but a few months later decided to brave the 50 again; I stuck with it, accepted it's apparent softness and the shift, and to this day it is still my utmost favorite lens to shoot :) Moral of the story: it might take a while to get used to using it, but it's well worth it!


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Apr 27, 2015 13:56 |  #986

Used the 50L for an old school look.


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Apr 27, 2015 23:24 |  #987

Just got mine today, so I took couple test shots of my 70-200 at f1.2 and f8. Looks pretty sharp to me! Time to just go out and enjoy it now.


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Apr 27, 2015 23:35 |  #988

My 50 is good at 1.2 and 8.0 as well.
I only noticed the problem by chance as I use the safety shift feature in shutter/aperture mode.
Because I was playing with it wide open (as you do) in certain instances the light gathering ability outstripped the top shutter speed.
The camera stopped the lens down to correct exposure and there it was, f2.0 to f4.0 all mis-focused.
The actual sharpness of the lens is really good.


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EchoShotz
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Apr 27, 2015 23:42 as a reply to  @ fordmondeo's post |  #989

I was toying around outside trying to lock focus on my friend riding his skateboard and shooting at 2.8 on AI Servo, but I really noticed no issues maintaining focus and getting a pretty good hit rate.


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Apr 27, 2015 23:56 |  #990

EchoShotz wrote in post #17535291 (external link)
I was toying around outside trying to lock focus on my friend riding his skateboard and shooting at 2.8 on AI Servo, but I really noticed no issues maintaining focus and getting a pretty good hit rate.

I have to say, my hit rate is very much higher at distances greater than 12 feet.
The problem is only really manifest at under 5 feet and at apertures f2.0 to f4.0 where the shift in plane of sharp focus is greater than the depth of field.


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