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A7MK2 with MF zoom lens

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Post Options Post Options   Quote amozak Quote  Post ReplyReply Direct Link To This Post Topic: A7MK2 with MF zoom lens
    Posted: 18 October 2022 at 21:22
Hello all! I have a question that hopefully one of you can help with. Still getting to know my new A7MK2 that I purchased to replace my A900 that suffered the infamous mirror falling out issue. I hate to admit that I'm almost happy my A900 broke, otherwise I wouldn't have known about the A7MK2. What a beautiful camera, thanks to all of you who recommended it. Manual focusing is so easy now for someone like me with bad eyes. My question is on how to set the steady shot for use with a manual zoom lens. Would I set it for the minimum zoom or the maximum, or even for a setting somewhere in the middle? Any input would be appreciated. All the best...Art
 



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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 18 October 2022 at 21:40
Congrats on getting an A7ii, it's my most used camera at the moment, even more than my A7Rii, mostly because I think 24 MP is more than I need anyway for 99% of my photography.


I mostly set it at the minimum focal length. My logic is that as the focal length increases the sensor movement gets bigger and setting the focal length too long might easier lead to overcompensation which I think (not sure) is worse than undercompensation when the focal length is set too short.

Only if I'm sure that I'm only going to shoot in the longer range of the zoom I might set it in the middle or closer to the long end.

To be fair, I mostly use MF primes and MF zooms are used much less

But it's an interesting question I look forward what others do in this case (and why)
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Post Options Post Options   Quote XKAES Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2022 at 02:04
Add in another factor -- which is what exposure mode you are using.

(You really can't use the P or S mode, because the camera can't control the f-stop.)

On shorter focal lengths lenses, it's less of an issue, but if you are in M mode, you control the shutter speed -- and the 1/focal length "rule" should suffice. It's the A mode that would create a problem -- but since the shutter speed is in the viewfinder, it can be managed -- with or without the STEADY SHOT.

I use a lot of Rokkor lenses on my A850s -- usually in M mode -- and often use it on a tripod for long lenses or slow speeds. And the manual says to turn OFF STEADY SHOT when a tripod is used.

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amozak View Drop Down
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Post Options Post Options   Quote amozak Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2022 at 02:59
Thank you all for responding! Usually when using MF lenses I've been setting the camera in aperture priority. I'm going to try setting it for the minimum focal length and see how that works out. Thanks for the input.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2022 at 10:12
Here's a tool a user created to help with this:
http://aggregate.org/DIT/IBIS/
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2022 at 10:37
Thanks for that link Matthew, I never have seen that site before but now it's bookmarked

So my practice/advice to stay at the minimum is not optimal, my manual zooms are a 35-70 which would be optimal over the whole range at a ~50 mm setting and a 80-210 which is optimal at a ~135 mm setting.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2022 at 11:10
With manual lenses I tend to only use primes , so I set the FL to what it is .
I rarely use zooms on MF cameras , though I'm happy to on AF SLRs.
If I'm using a short zoom , 28-85mm for eg , I've tended to not use IS , just set the shutter speed to suit the subject and light , yet high enough to prevent motion blur .
Aperture I set to what the subject needs , and I leave ISO to auto and the camera in manual mode .
With modern cameras you can use much higher ISO and still get clean results , so that compensates for the lack of IS .

For longer zooms like 70-200mm I set the FL in IS close to the long end , so around 180mm . Typically I'd be using the zoom around 150-200mm so I find this close enough for good results .
Camera still in Manual mode , or Aperture priority, auto ISO.

On a camera without auto ISO ( or selectable IS FL ) I've still used the camera set in shutter priority and the ISO set to auto .
As the camera can't control the aperture of a manual lens , it gives correct exposure via the ISO .

Basically , play around with the camera and see what works for you . I find if the set FL in close to what your shooting at , it'll work fine .

Enjoy the pictures you take and don't pixel peep !
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 19 October 2022 at 13:42
I did the maths of this a while ago and my conclusion was that the modest gain in shutter speed /sharpness worked over a fair range of focal lengths at the long end, typically (in my case) 300-500mm with the FL set to 400mm. For something like a 70-200 I'd set it to 150mm and possibly turn it off at 70mm.
Oh, useful site Mathew, so thanks for the link.
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 20 October 2022 at 10:42
I've moved the posts relating to Auto ISO to a separate thread Auto Iso discussion since it was really off-topic given the OP's question but still an interesting separate subject. Pls. keep this thread now on topic (how to set the AS for a manual zoom lens) and continue the discussion on Auto ISO in the new thread
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