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Thread: Sony FE 35/2.8 ZA Issues with focusing and color shift

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    Sony FE 35/2.8 ZA Issues with focusing and color shift

    While examining shots I have taken over last week or so with my SEL35F28Z on A7R I have noticed two issues:

    1. Often enough focus is missed. For example, if I take 3 shots in a row of same "target" often at least one of them is misfocused by amount that is noticable.

    2. In some scenes I am noticing color shift toward magenta in quite a part of the frame, way one would get them when trying to use M wide glass.

    Has anybody else experienced same? Any thoughts?

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    I got question about color shift answered over on FM (looks like not only 35/2.8 exhibits them but so does 55/1.8), but no experiences shared on misfocuses yet. Does that mean everybody else's 35/2.8 is focusing perfectly 100% of time?

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by ZoranC View Post
    While examining shots I have taken over last week or so with my SEL35F28Z on A7R I have noticed two issues:

    1. Often enough focus is missed. For example, if I take 3 shots in a row of same "target" often at least one of them is misfocused by amount that is noticable.

    2. In some scenes I am noticing color shift toward magenta in quite a part of the frame, way one would get them when trying to use M wide glass.

    Has anybody else experienced same? Any thoughts?
    ZoranC:

    I remember back in January there was a lot of talk about the A7R missing focus with the 55mm more than with the 35mm. The A7 was decided to be the one with the more accurate (and rapid) af in good light. In bad light neither one is stellar. I think folks compensate by half pressing the shutter button a couple of times to make sure the focus is on the correct point. I often check with the focus aids (magnified focus or eye focus for portraits) to ensure critical focus. As far as color shifts, you'll have to consult the more color sensitive membership of the forum but actually reading over the discussions of the 35 and 55mm FEs I don't remember them getting much criticism on the color shift front.

    Regards,
    John

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by jfirneno View Post
    ZoranC:

    I remember back in January there was a lot of talk about the A7R missing focus with the 55mm more than with the 35mm. The A7 was decided to be the one with the more accurate (and rapid) af in good light. In bad light neither one is stellar. I think folks compensate by half pressing the shutter button a couple of times to make sure the focus is on the correct point. I often check with the focus aids (magnified focus or eye focus for portraits) to ensure critical focus. As far as color shifts, you'll have to consult the more color sensitive membership of the forum but actually reading over the discussions of the 35 and 55mm FEs I don't remember them getting much criticism on the color shift front.

    Regards,
    John
    John, thank you for your input I do remember that while ago there were some reports of autofocusing issues but IIRC they were mentions by some of the journalists from Sony's Nashville PR event and were that A7 is having problem autofocusing, while A7R is not, with no comments that issue is with the lenses. Are you talking about some different reports? If yes do you happen to have link to those discussions, please? Thank you again!

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by ZoranC View Post
    John, thank you for your input I do remember that while ago there were some reports of autofocusing issues but IIRC they were mentions by some of the journalists from Sony's Nashville PR event and were that A7 is having problem autofocusing, while A7R is not, with no comments that issue is with the lenses. Are you talking about some different reports? If yes do you happen to have link to those discussions, please? Thank you again!
    The missed the focus was from threads on this site.

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by jfirneno View Post
    The missed the focus was from threads on this site.
    Thank you! I will need to do some digging ...

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by ZoranC View Post
    In some scenes I am noticing color shift toward magenta in quite a part of the frame, way one would get them when trying to use M wide glass.

    Has anybody else experienced same? Any thoughts?
    for the FE 2.8/35 ZA you definitely need a neutral white plexi plate with high diffusion to make white reference shots. Look for "Lens Cast Calibration" and/or "White Shading". Capture One and Lightroom provide tools to correct light falloff and color cast based on white reference shots. Capture One's so called "lens cast calibration" tool is very mature... it works excellent. I've heard mixed things about Lightroom's "Flat Field" Plugin... but I haven't used it yet, so I can't comment on it.
    I would recommend to switch on the internal camera correction for vignetting and just correct the remaining light falloff in post (together with the color cast).

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by thomas View Post
    for the FE 2.8/35 ZA you definitely need a neutral white plexi plate with high diffusion to make white reference shots. Look for "Lens Cast Calibration" and/or "White Shading". Capture One and Lightroom provide tools to correct light falloff and color cast based on white reference shots. Capture One's so called "lens cast calibration" tool is very mature... it works excellent. I've heard mixed things about Lightroom's "Flat Field" Plugin... but I haven't used it yet, so I can't comment on it.
    I would recommend to switch on the internal camera correction for vignetting and just correct the remaining light falloff in post (together with the color cast).
    Thank you! IIRC RX1 had color cast issues too, and Imaging Resource claimed they were only if you used in camera correction for vignetting. With A7R allegedly cooking this in RAW when enabled I might try it disabled and see does color cast go away.

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by ZoranC View Post

    1. Often enough focus is missed. For example, if I take 3 shots in a row of same "target" often at least one of them is misfocused by amount that is noticable.



    Has anybody else experienced same? Any thoughts?
    I have substantially improved my success rate by putting the camera into MF mode and using AF/MF button only to autofocus. I found that using the shutter button to autofocus even small movements of the subject (or o the camera) cause unnecessary focus hunting and hence misfocus when shooting fast.

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by Ario Arioldi View Post
    I have substantially improved my success rate by putting the camera into MF mode and using AF/MF button only to autofocus. I found that using the shutter button to autofocus even small movements of the subject (or o the camera) cause unnecessary focus hunting and hence misfocus when shooting fast.
    Hmmm... I gotta try this, thank you for the tip So you are saying that camera will continue to hunt for the focus even while shutter is half-depressed and focus mode is AF-S?

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by Ario Arioldi View Post
    I have substantially improved my success rate by putting the camera into MF mode and using AF/MF button only to autofocus. I found that using the shutter button to autofocus even small movements of the subject (or o the camera) cause unnecessary focus hunting and hence misfocus when shooting fast.
    Marc mentioned this and I converted my cam this morning to that button and work in MF mode but Im having issues with my custom function setup. I need a rundown on menu setting for this as I lost my ability to move my focus point or my focus area that I had for C3 but if I go to AFs or DMF its there. Im not sure what setting for AF/MF button. I have it set for AF/MF Control hold.


    Any guidance on this setup would be nice. Here is my problem along with others Im sure i have 3 manual focus lenses a FE than 2 A mount lenses and I want them to act the same.

    What I am not fond of with the FE is if I touch the lens it goes into zoom and I would rather do that like I do with the rest of my glass. Bottom line a simple 1 /2 punch for all the glass.
    Photography is all about experimentation and without it you will never learn art.

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    My settings for focussing:

    C1 set to Focus Setting

    C3 set to AF/MF toggle

    Central Button set to Standard

    AF/MF central button set to AF/MF Control Hold

    MF Assistant ON

    In MF: C1 activates the zoom , AF/MF central button activate the AF, the focussing point can be moved using the left-right- up-down button or with the front and back dials if the zoom has been activated , or with a push on the central button. Turning the focus ring on the lens activates the zoom only if MF assistany in ON

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Thanks Ario let me try that. . My central button is set to hold let me fix this. Thanks appreciate the help.
    Photography is all about experimentation and without it you will never learn art.

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    What do you have C2 set for. I may make that ocus settings
    Photography is all about experimentation and without it you will never learn art.

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    At the moment I use C2 for Zebra (100+ for ETTR or OFF). I find the position of C2 not very convenient so I prefer not to assign it to something I use frequently and I have to oprate quickly.

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Yea I had it to turn LCD off/on
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Central button set to standard.

    Lost me there
    Photography is all about experimentation and without it you will never learn art.

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    With the Central Button set to standard I can move the focussing point both in AF and in MF.

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    I got it now. Thanks
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: Sony FE 35/2.8 ZA Issues with focusing and color shift

    Quote Originally Posted by Guy Mancuso View Post
    I may make that ocus settings
    Is that related to an Otus setting? If so it might be really cool

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