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lens calibration

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beccles View Drop Down
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Post Options Post Options   Quote beccles Quote  Post ReplyReply Direct Link To This Post Topic: lens calibration
    Posted: 06 July 2019 at 13:54
have splashed out & am now awaiting delivery of a Sony SAL70400G2 70-400mm F/4-5.6 SSM ii G.. Have read somewhere about lens calibration - is this necessary? if so, how do you do it? Lens will be on my A77ii
 



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mambo View Drop Down
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Post Options Post Options   Quote mambo Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2019 at 14:19
Lens focus micro-adjusting is only necessary if there is a problem with sharpness.

I suggest that you use it for a few weeks before changing anything.
Charles M

A99ii,A99,A77ii, Minolta:|200f2.8HS|85G|SAL50f1.4Z|SAL24F2Z|∑35f1.4Art|50f2.8macro|A6300| Viltrox 85f1.8|SEL200600G|Zeiss32f1.8|Sigma16f1.4
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jvandegr View Drop Down
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Post Options Post Options   Quote jvandegr Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2019 at 18:23
Agree with mambo. You really need to spend some time with it before you decide to do any calibration. If you primarily use autofocus, a few missed shots that are slightly out of focus might not be indicative of a calibration issue. Rather, it could just be the AF system deciding it wanted to focus on something else near your AF point. After awhile, as you develop and work with the images, you should be able to see a pattern if there is a problem.
Jon Van de Grift
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beccles View Drop Down
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Post Options Post Options   Quote beccles Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2019 at 18:51
ok, thanks.. i would have been surprised if such an expensive lens needed it, just that i've seen it mentioned.
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jvandegr View Drop Down
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Post Options Post Options   Quote jvandegr Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2019 at 19:07
Price makes little difference. In Leica world, we sometimes send tens of thousands of dollars worth of equipment back to Germany to be calibrated, lens-to-camera. Rangefinders are a bit different of course, but you get the point. I wish you good luck with your Sony zoom - it's one of the better lenses of its kind.
Jon Van de Grift
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Post Options Post Options   Quote mirthseeker Quote  Post ReplyReply Direct Link To This Post Posted: 07 July 2019 at 01:26
Gary Reid (@Fivepin) has a youtube video showing how he does it.
 



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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 07 July 2019 at 14:48
Originally posted by beccles beccles wrote:

ok, thanks.. i would have been surprised if such an expensive lens needed it, just that i've seen it mentioned.
I notice that you use or used the Tamron SP 70-300, did you ever feel the need to calibrate that lens?

Like the others said, use the lens before you decide to calibrate. Become comfortable with the lens. If you then feel the focus might be (slightly) off, then do a calibration. The only lens that I felt needed lens calibration was the Sony 18-135 that got a +5 setting on my A77m2.

If you calibrate, you have to make a choice at what focallength you do it. With a 70-400 lens, you probably will do the adjustment at 400mm, just make sure that is the focallength you use the most.

There are several articles and videos that explain how to do lens calibration. Look those up after you watched Fivepins video.

Do not worry and sure the pictures with your new lens with us
Why not follow me on Instagram? @Addy_101
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beccles View Drop Down
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Post Options Post Options   Quote beccles Quote  Post ReplyReply Direct Link To This Post Posted: 07 July 2019 at 14:57
thanks for the replies. Health permitting (have myelofibrosis) am off to south africa for 2 weeks in october so the lens will get a good run out then. :-)
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TomV View Drop Down
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Post Options Post Options   Quote TomV Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2019 at 21:53
I have found that all my longer lenses need some MFA tweaking.
My arsenal, past and present:

Minolta 400 and 600, Sigma 300 and 500, Sony 70-400 I and II, Sony 300 II and Sony 500 G.

My Sony 500 f/8 did not require a tweak. The latest Tamron 90 mm macro is also spot on.
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