Lens Micro-Adjust Techniques
Jan 14, 2018 12:17:01 #
Gene51 wrote:
Keep in mind that focus is not linear. Infinity may be fine, but at different distances and/or focal lengths you may see front AND back focusing. You won't know for sure unless you test it. If you have such a situation, then only the mfgr can successfully address this.
So?
Jan 14, 2018 12:25:03 #
Jan 14, 2018 12:59:24 #
dandev wrote:
I have a Canon 5D3 with a number of different lenses. I bought an inexpensive ($10) focusing card from Amazon, but don't feel like I really have it dialed in. Then I tried a ruler set to a 45 degree angle. After some of my adjustment attempts, the autofocus was worse.
Can anyone recommend a good tool and technique for determining where to set the micro-adjust? (I know how to set the adjustments in the camera.)
Thanks
Can anyone recommend a good tool and technique for determining where to set the micro-adjust? (I know how to set the adjustments in the camera.)
Thanks
Adjust it so that it falls off more in the rear than the front. About 2/3rds verses 1/3rd ratio.
Jan 14, 2018 13:22:14 #
dandev
Loc: Enumclaw, WA
Good point. So should you set your AF a little beyond where you want to focus? I had a portrait photographer tell me to focus on a cheek vs, a nose, since that is 1/3 of the way across a person's head.
Jan 14, 2018 13:38:17 #
dandev wrote:
Good point. So should you set your AF a little beyond where you want to focus? I had a portrait photographer tell me to focus on a cheek vs, a nose, since that is 1/3 of the way across a person's head.
I would say you must, as an end result, set the focus EXACTLY where you want the SHARPEST rendition of your subject matter - period.
Jan 14, 2018 14:51:57 #
robertjerl wrote:
Reikan FoCal B&H carries it here in the US, the top of the line version does most of the work "automatically".
Review: http://www.northlight-images.co.uk/focal-autofocus-adjustment-calibration-software-review/
Review: http://www.northlight-images.co.uk/focal-autofocus-adjustment-calibration-software-review/
Great Program it will also gives you other stats on your lens such as the f-stop sweet spot, highly recommend FoCal
Jan 14, 2018 15:16:07 #
papa wrote:
I use Magic Lantern's AFMA and it works quite well automatically with all four of my lenses: Tokina 16-28, Tammies 24-70, 70-200, 150-600. Best part is it's free and has amazing tools on the menu. If you're not familiar, then you can bone up here; https://www.magiclantern.fm/index.htm
Alas the lantern is not yet available for the 6d Mk II... my watch begins.
Jan 14, 2018 18:35:03 #
dandev wrote:
Good point. So should you set your AF a little beyond where you want to focus? I had a portrait photographer tell me to focus on a cheek vs, a nose, since that is 1/3 of the way across a person's head.
No, you always focus on the eye. When calibrating focus use a graduated chart at a 45 degree angle so that you can see how the focus falls off and how it does the same on closer subjects. Never focus on someones cheek unless you are shooting at f/22.. Seriously, anything that is living it's really important to get the eye in focus. Period.
Jan 14, 2018 20:32:43 #
barbie.lewis wrote:
Awesome! Results are probably even better with five beer cans, maybe seven!
I don't actually drink much beer. Would it work with diet soda cans?
I don't actually drink much beer. Would it work with diet soda cans?
NO, it won't work at all with diet sodas!!!
You could drink a 100 diet sodas, and you will NOT get drunk....so no, it WON'T work!!!
SS
Jan 14, 2018 21:02:43 #
chaman wrote:
Hard to believe.
Here’s the thread including downloadable images of a focus target taken with an EF 135 f2L, with and without correction - see what you think. http://www.uglyhedgehog.com/t-448768-1.html
One thing to consider which may explain the differing opinions on the value of MFA correction is how and what you shoot. I’d you shoot typically stopped down a few stops or more, you may never notice the focusing error because the DOF “hides” it, but if you shoot a fast (and especially a long) lens wide open with a DOF of inches or less, then any error will be obvious. Another thing to consider: if you’ve never seen your particular lens calibrated, how would you know if there was more sharpness available or not or if it needed correction?
Jan 14, 2018 21:10:35 #
Jan 14, 2018 21:17:51 #
Jan 14, 2018 21:19:56 #
SharpShooter wrote:
NO, it won't work at all with diet sodas!!!
You could drink a 100 diet sodas, and you will NOT get drunk....so no, it WON'T work!!!
SS
You could drink a 100 diet sodas, and you will NOT get drunk....so no, it WON'T work!!!
SS
Funny you should say that....I shoot a lot of small venue / club concerts and I have noticed that my shots early in the show (before beers) are not as sharp as the shots later in the show (after a few beers). Now I'm not promoting drinking while shooting by any means, but it seems true sometimes. Also, if you ever go out on an early-before-sunrise morning shoot, don't do the coffee before leaving!
Jan 14, 2018 23:01:52 #
RRS
Loc: Not sure
imagemeister wrote:
I would say you must, as an end result, set the focus EXACTLY where you want the SHARPEST rendition of your subject matter - period.
For portraits that would be the eyes.
Jan 15, 2018 13:45:17 #
Architect1776 wrote:
So?
Strange response. . .
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