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Archive 2016 · Metering issue with alt lens - two to three stops exposur...
  
 
igmolinav
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p.1 #1 · p.1 #1 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?



Hi,

I have been using a Sony A7ii with an old Canon 35 mm. f/1.5
manual lens. The adapter being used is a Fotasy for Leica M
mount.

The camera is set to 'S' mode, so the shutter speed can be
varied. I usually shoot at 1/60th of a second and end up shooting
with a diafragm of f/8 or f/11. The ISO speed is varied according
to the time of the day.

The camera I use shows two blinking arrows to the sides of the
screen when I am shooting. These arrows blink to tell that the
image at that precise exposure level will be either over- or under-
exposed.

When I see signs of overexposure or underexposure, I either
close or open the diaphragm.

Until about three weeks the meter was much more precise.
If I was at the right exposure level and I opened or closed the
diaphragm by one stop, it showed immediately on the display
with a blink that I was not at the right exposure level anymore!

However, now I can be right at three exposure levels! Of, course
I notice the difference even if the camera doesn't tell, but I would
like again to have that preciseness back!

I'll be shooting today with the camera again. I had not been
able to shoot in the past four days. I hope is not something that
needs sending the camera for repair.

Unfortunately, I have tried the camera here in my room with the
light coming in from the window and the metering is reading or
allowing three exposures as if they all were at the right exposure
level!

Thank you, kind regards,

igmolinav : ) !!!





Oct 29, 2016 at 11:15 AM
Steve Spencer
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p.1 #2 · p.1 #2 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?


You can't use shutter speed priority mode with adapted lenses, because the camera can't control the aperture. You need to use manual mode in which you control the aperture to get good exposure if you want a specific shutter speed with an adapted lens. My guess is that because you are using shutter speed priority mode the camera is trying to adjust auto ISO and that is messing up your results. You should be fine if you do full manual mode and you set a specific ISO. If that doesn't work then you will need to either have the camera serviced or figure out the correct exposure for each situation just like people did with a film camera.


Oct 29, 2016 at 11:24 AM
Makten
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p.1 #3 · p.1 #3 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?


"When I see signs of overexposure or underexposure, I either
close or open the diaphragm."

After that, are you waiting for the arrows to tell you that the exposure will be correct, or do you just shoot immediately? It could be oil on the aperture blades that make the blades close or open very slowly, or not move at all.

Try A mode instead, letting the camera set the exposure time while you set the aperture.



Oct 29, 2016 at 11:26 AM
ClausC
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p.1 #4 · p.1 #4 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?


Why not shoot full manual ? Take a testshot and discard it afterwards ? Maybe adjust a bit to the actual situation (Dark subject, Bright Subject).



Oct 29, 2016 at 12:30 PM
igmolinav
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p.1 #5 · p.1 #5 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?


Hi,

Thank you for your messages : ) !!!

I have taken a few days to further try the camera and see
if things have changed for the better with regard to the
above mentioned situation.

I got the idea of setting the camera to 'S'
after reading an article on the internet. The recommendation
was setting the camera to 'S', so that one could choose a
diaphragm. The ISO speed would be set to ISO Auto. I went
with this option at the beginning, but for the camera was,
let's say, easy, more than often to choose 6400 ISO, even
around midday with quite a lot of sun. I decided then to
choose a given ISO speed depending on the time of the day
and the quantity of light available. It worked out wonderfully
until I recently had the above problem. Yes, the camera may
need to go to Sony for a revision.

I have used 'A' these past days, and also 'S' with the hope of
a 'recovery'. I am just starting to use 'M'. Using 'A' was very
good, one only has to watch out in the evenings that one has
enough ISO speed, so that the shutter speed, chosen by the
camera, remains more or less around a specific speed. I have
missed a couple of shots this way when suddenly it got darker
and I had not changed neither the ISO, nor the aperture, and
the chosen speed was too low. That is one of the reasons I
kind of felt better working with 'S'. 'M' seems as good as 'S',
I just think I have to use the function a bit more. In a way
using 'M' with a manual lens on the Sony A7ii is very similar
to using 'S' when it regards, I think.

I am still thinking about those three f stops that the camera
marks as right when using 'S'. The only other things I can
think of, is that by mistake I had previously activated a shooting
function that 'bracketed' automatically the images; giving me three
images per shot. I activated it by mistake. My idea is that
perhaps the 'camera's brain' may 'still want to bracket' in spite
the fact that the camera has been set back to the simplest
shooting capability that is 'single shot'. The other thing I think is
that the camera has only been used with only one manual lens.
No other manual or automatic lens has been used. Perhaps
using an automatic sony lens helps the camera in overall.

Thank you again, kind regards,

igmolinav : ) !!!



Nov 02, 2016 at 09:38 AM
 

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matthewm
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p.1 #6 · p.1 #6 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?


I almost always shoot in Aperture Priority (A) with Auto ISO set to a range of 100-6400 and a minimum shutter speed of 1/30. For the lenses I typically use, these parameters give me excellent results and I'm confident enough in the IQ of the A7II all the way up to ISO6400. I shoot this way regardless of whether or not I'm using native or legacy glass.

As someone else said, shooting in Shutter Priority (S) isn't really the way to go with legacy glass as the camera has no control over the Aperture. When using native glass and Auto ISO you can set your shutter speed (1/1000 or whatever) and the camera will set the aperture and ISO accordingly to make sure you get enough light. That might be f/2.8 at ISO 100 or it might be f/8 at ISO 400. It's really up to the camera at that point (some cameras lean more towards cleaner images and brighter f-stops while others will balance it out with a mid-range f-stop and ISO). Alternatively, if you set your shutter speed and ISO, the camera has only one parameter to set, which is aperture and it will do so accordingly, assuming there's enough light given the maximum or minimum aperture of the lens.

If you're shooting mid-day in the Mojave Desert and you have your shutter speed set to 1/60 and your ISO to 400, it's unlikely the camera can stop your lens down far enough to compensate. Alternatively, if you're shooting on dark Parisian streets at midnight and have your ISO set to 100 and your shutter speed to 1/500, unless you have extremely fast glass, it's unlikely your camera will be able to find you a suitable aperture to make your images bright enough for those conditions.

Shoot in Aperture Priority mode and Auto ISO with ISO limits set (if you don't want high ISO, then set your limits from 100 to 400 or something)... Set the aperture via your lens, and let the camera do the rest.

One last thing is to check your metering mode. Maybe before you were using Spot or Center-Weighted and now you're using Matrix Metering and it's metering the entire scene rather than just the spot or center. I run into this sometimes because I often use the focus-recompose style of shooting and if I'm in spot or center-weighted, using the center focus point, I get my focus and metering all at once. Sometimes in contrasty lighting situations, I get funky results with matrix so using spot or center-weighted helps (especially given my shooting style).



Nov 02, 2016 at 01:02 PM
igmolinav
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p.1 #7 · p.1 #7 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?



Hi,

Thank you for your message : ) !!!

How do you set the ISO limits for the Auto ISO ??
It would be wonderful for me to be able to set the
limits, for example, between IS0 100 and 400, only
when using Auto ISO. That way I know my Auto
ISO will not be higher than 400.

I used Auto ISO when I had just gotten the camera.
The camera's Auto ISO was in very bright situations
choosing ISO speeds as high as 6400. Just before
or after midday the Auto ISO with 6400 was not
good for the images because it added too much
graininess to the image. I use high ISOs, between 800
and 6400, only when necessary.

The metering mode is set to 'Multi', just as before.

Thank you, kind regards,

igmolinav : ) !!!



Nov 03, 2016 at 09:51 AM
matthewm
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p.1 #8 · p.1 #8 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?


igmolinav wrote:
Hi,

Thank you for your message : ) !!!

How do you set the ISO limits for the Auto ISO ??
It would be wonderful for me to be able to set the
limits, for example, between IS0 100 and 400, only
when using Auto ISO. That way I know my Auto
ISO will not be higher than 400.

I used Auto ISO when I had just gotten the camera.
The camera's Auto ISO was in very bright situations
choosing ISO speeds as high as 6400. Just before
or after midday the Auto ISO with 6400 was not
good for the images because it added too
...Show more

To set Auto ISO with a range, do the following:

Press Menu
Go to Page 4 on the Camera Section
Scroll to ISO and Press the Center Button
Scroll to AUTO and Press the Right Button
Set ISO AUTO Minimum by Scrolling Up/Down
Press Right Button to Scroll to ISO AUTO Maximum
Set ISO AUTO Maximum by Scrolling Up/Down
Press Center Button

Voila! You've got Auto ISO with limits.



Nov 03, 2016 at 12:31 PM
igmolinav
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p.1 #9 · p.1 #9 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?



Hi,

Thank you for your message : ) !!!
and thank you for showing me how !!!

It is an amazing feature! And the
ISO range stays saved, even if one
changes to another specific ISO speed
and later on one wants to comeback
to the ISO range.

Kind regards,

igmolinav : ) !!!



Nov 04, 2016 at 07:43 PM
matthewm
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p.1 #10 · p.1 #10 · Metering issue with alt lens - two to three stops exposure tolerance - isn't that too much?


igmolinav wrote:
Hi,

Thank you for your message : ) !!!
and thank you for showing me how !!!

It is an amazing feature! And the
ISO range stays saved, even if one
changes to another specific ISO speed
and later on one wants to comeback
to the ISO range.

Kind regards,

igmolinav : ) !!!


Glad to be able to help! Happy shooting!



Nov 04, 2016 at 07:46 PM







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