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What could be wrong?

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wthibeaux View Drop Down
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Post Options Post Options   Quote wthibeaux Quote  Post ReplyReply Direct Link To This Post Topic: What could be wrong?
    Posted: 18 December 2018 at 23:59
My Sony a330 has suddenly started overexposing. I use exposure compensation to correct, but sometimes up to -1.7 and I'm afraid that I'll run out of compensation. Does anyone have any ideas?
 



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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: 19 December 2018 at 01:09
Originally posted by wthibeaux wthibeaux wrote:

My Sony a330 has suddenly started overexposing. I use exposure compensation to correct, but sometimes up to -1.7 and I'm afraid that I'll run out of compensation. Does anyone have any ideas?


Does it happen with all your lenses or not? If it is with a particular lens; then it is likely due to oily and therefore sticky blades.
Charles M

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SnowFella View Drop Down
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 01:16
To test the above take 2 shots, first one with the aperture wide open and then one well stopped down.
If the blades are sticky the wide open shot should come out ok while the stopped down one will be overexposed.
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Fivepin View Drop Down
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Post Options Post Options   Quote Fivepin Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 01:44
Its your lens...stuck aperture.
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mirthseeker View Drop Down
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Post Options Post Options   Quote mirthseeker Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 05:09
Originally posted by SnowFella SnowFella wrote:

To test the above take 2 shots, first one with the aperture wide open and then one well stopped down.
If the blades are sticky the wide open shot should come out ok while the stopped down one will be overexposed.


To confirm, remove the lens, and with a toothpick or similar, move the aperture lever so that the aperture is wide open. The lever should snap back when released, unless sticky blades are the issue.
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Bob J View Drop Down
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 05:52
if it is the lens the problem shoudl exhibit more at smaller apertures and should go away when used wide open..
 



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rastapartaman View Drop Down
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Post Options Post Options   Quote rastapartaman Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 12:47
Take a picture wide open. If it's got the right exposure the problem is with the lens.
Don't think, Just click it!!

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wthibeaux View Drop Down
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Post Options Post Options   Quote wthibeaux Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 14:17
Thank you for your reply. I tried your advice on the aperture blades and they snap back quickly. Do you have any other suggestions?
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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 14:44
Next check the aperture actuator on the camera, it's probably bent and not contacting the lever on the lens.
Rob Suits Jr.
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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 December 2018 at 16:02
Originally posted by wthibeaux wthibeaux wrote:

Thank you for your reply. I tried your advice on the aperture blades and they snap back quickly. Do you have any other suggestions?
Take a picture wide open and one at f16 (with corrosponding iso/shutter speed to get the same EV) and if the f16 one is overexposed it's an aperture problem. If they are both equally (over)exposed it's a problem with your light meter.
Mind the bandwidth of others, don't link pictures larger then 1024 wide or 960 pix high, see here
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wthibeaux View Drop Down
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Post Options Post Options   Quote wthibeaux Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 16:30
Thanks for all the replies. It seems to be ok now. I took pictures at f3.5, f8 anf f16 and they all seem ok. Mysterious.
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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 December 2018 at 16:52
Maybe something was "slightly" stuck in the aperture mechanism and by testing the aperture "off camera" it became loose and snappy again.
Mind the bandwidth of others, don't link pictures larger then 1024 wide or 960 pix high, see here
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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2018 at 17:29
How often do you use the camera? If it's just for a yearly vacation or holiday snaps that might cause things to get sticky. I'd recommend to pick it up once a month or so and take a few test shots at f22 to keep everything loose and lubricated.

Edited by stiuskr - 19 December 2018 at 17:32
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 CZ24-70G2 KM28-75D So70-200G1 So70-300G So70-400G1| SonyF60 AD200R2
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