More helicoid adapter fun with a Takumar 50mm f1.4.
Normally when using manual lenses I use aperture priority until the shutter speed drops too low and then switch to manual mode, both with auto ISO letting the ISO float up and down as it sees fit. Today whilst using this adapter I noticed that the ISO wasn't floating and was staying at 100 with the picture getting darker as I closed down the aperture. I switched to manual ISO and set it to 400 and then set the exposure by varying the shutter speed. Later I tried to reproduce this indoors and couldn't so I'm not sure what was going on. I assume it was down to one of two things, either the as the light was quite bright and harsh the metering was getting a little confused and/or there was some metering difficulty as the lens was moved away from the sensor, or a combination of both of these things. But I haven't been able to reproduce this and it's not something I've seen before with this camera (Sony A7) so I'll just have to watch out for any metering anomalies next time I'm out with this combination.
Unless someone else has seen this?