1

When I set the aperture and shutter speed on my a6000 in manual mode the aperture always changes when I take the photo. I am using a sony 24-240mm lens f/3.5-6.3. It does the same in aperture mode.

Any suggestions.

Improve this question
5
  • 5
    What focal length are you set at? You might be too far zoomed out to be allowed to shoot at f4.0. what aperture are you getting?
    – thebtm
    Feb 6, 2017 at 16:23
  • 1
    To expand on @thebtm comment, note that for a zoom lens, the low f-number refers to the widest aperture when zoomed out, and the high f-number to the widest aperture when zoomed in. So at e.g. 240mm your lens has a widest aperture of f6.3 ( and f4 is not possible ).
    – StephenG - Help Ukraine
    Feb 6, 2017 at 16:27
  • 1
    The usual cause is that you have previously selected Bracketing mode, but have not turned it off.
    – WayneF
    Feb 6, 2017 at 17:21
  • I think it is the focal length that is the issue. I need to use a faster lens but I don't have the funds for a faster lens.
    – Kerry Spong
    Feb 6, 2017 at 19:19
  • 1
    The question should be edited to add the missing information, e.g., "the aperture changes when I change the focal length".
    – user29608
    Feb 7, 2017 at 8:36

1 Answer 1

Reset to default
3

Your Sony 24-240mm f/3.5-6.3 lens is not capable of opening up to f/4 through out its entire focal length range. By the time you zoom all the way to 240mm, the widest possible aperture is f/6.3. Your camera senses that and compensates accordingly.

For more about variable aperture vs. constant aperture zoom lenses, please see:
How do zoom lenses restrict their widest aperture at the telephoto end?
Why does my aperture setting change as I zoom on my DSLR kit lens?
Why do zoom lenses and compact cameras have varied maximum aperture across the zoom range?

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.