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Old Thursday 8th September 2016, 10:56   #1
Al Downie
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Exposure issue with Fuji X100

HI all,

I'd be very grateful for advice from anyone who's using a Fuji X-series camera, or who might have seen the same issue that I'm finding just now.

I have my X100 set to Aperture Priority Auto, and everything works as I would expect while I'm using maximum aperture (f2). But when I change my aperture to anything else, then, when I half-press the shutter the image in the EVF suddenly flares into over-exposure, and this is reflected in the final capture too. I can correct it to a limited extent with exposure compensation adjustment, but not if I select f5.6 or greater.

This only happens when the camera is attached to the scope - at all other times the EVF preview responds to aperture changes just fine.

If any of you have seen this before, did you manage to find a solution or workaround? I'd be very grateful for advice.

Cheers,

Al
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Old Thursday 8th September 2016, 23:21   #2
Telephoto Paul
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If it's a mark I X100, that sounds like the symptoms of the dreaded sticky aperture blades problem - basically the aperture blades are stuck open at f2 so when you press the shutter and it tries to stop-down, it doesn't and the picture is over-exposed. But if that's the cause it's puzzling that it only occurs when it's mounted to a scope - perhaps the way it's mounted is putting some force in to the lens?
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Old Friday 9th September 2016, 10:25   #3
Al Downie
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Thanks Paul! That never occurred to me at all. It does sound plausible in terms of the effect that's produced, but I agree it's strange that it should only happen when the camera is pressed against the scope. I normally set up the scope for digiscoping with the eyecup extended all the way out, and there's a gender-changer ring on the lens filter thread (which extends beyond the range of movement of the lens as it focuses), so I don't think there's any pressure on the lens that might be transferred to the aperture blades. Still scratching my head...
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Old Friday 9th September 2016, 16:45   #4
Telephoto Paul
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Sticky aperture blades was a specific and not uncommon issue with the original X100 so I reckon it's worth googling what others have said.
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