Hello, I thought share my ongoing experience with the rather bizarre behaviour of one of my Phase One DF bodies when using two of my adapted lenses at certain shutter speeds.
I noticed that some of my photos had pretty extreme purple fringing while using my Pentax A 35mm lens a couple of months ago, but over the last few weeks I have realized just how bad it is.
Basically, between the shutter speeds of about 1/10s and 1/100s the images range from having smeared high-contrast edges with "purple fringing" in the 20+ pixel range at the 1/10s end, to having an image that is completely tinted purple at 1/60s and 1/80s, where the problem is at its worst. I played around with it yesterday, and I am still not sure exactly what is causing it or why.
To be clear, this only happens when I am using the combination of Leaf Aptus II12, one of my DF bodies, and adapted lenses. This mostly includes my Samyang 24mm and Pentax 35mm lenses at those shutter speeds, but it was also very evident with another adapted lens I'm testing at even higher shutter speeds ( up to 1/400s - testing is still ongoing with that one ). My Mamiya lenses at the same shutter speeds are fine, no issue. Using my Aptus II 7 back on that DF body with those lenses at those shutter speeds do not show the same problem. Using the same lenses with the Aptus II 12 on my second DF body with the adapted lenses do not show the same problem. The batteries used for both the digital back and DF body were swapped between the setup and remained the same, good charge on both and a genuine ( but old ) Leaf battery for the digital back. I am at a bit of a loss as to what is going on; whether the DF body is somehow glitching out in communicating with the Aptus II 12 ( or vice versa ), the digital back is freaking out for whatever reason, or there is another issue there somewhere.
I even dug out my Sony RX100 and recorded the shutter actuating at 1/60s exposure time at 960fps. Even at that speed ( and very noisy video ) you only have a few frames where you can see the shutter actuating ( it's very fast! ), and nothing really seems out of the ordinary.
It bothers me, but it's not a major deal-breaker in any real sense. That body has been relegated to being my back-up now, and it's possible to work around those shutter speeds if I need to. It's just a bit of a shame to have its usefulness severely restricted, and it would be nice to know what's going on.
Photos show the issue at its worst. White balance is set basically permanently at Daylight on the digital back. No adjustments have been made in post, but from experience simply adjusting the Green/Magenta slider will not clear it up completely - the colour does become more normal, but very washed out. I did notice some banding in the sky on one of the purple images after trying to adjust it. Issue clears up completely at 1/125s. Mamiya 35mm is fine at the same shutter speeds.
I noticed that some of my photos had pretty extreme purple fringing while using my Pentax A 35mm lens a couple of months ago, but over the last few weeks I have realized just how bad it is.
Basically, between the shutter speeds of about 1/10s and 1/100s the images range from having smeared high-contrast edges with "purple fringing" in the 20+ pixel range at the 1/10s end, to having an image that is completely tinted purple at 1/60s and 1/80s, where the problem is at its worst. I played around with it yesterday, and I am still not sure exactly what is causing it or why.
To be clear, this only happens when I am using the combination of Leaf Aptus II12, one of my DF bodies, and adapted lenses. This mostly includes my Samyang 24mm and Pentax 35mm lenses at those shutter speeds, but it was also very evident with another adapted lens I'm testing at even higher shutter speeds ( up to 1/400s - testing is still ongoing with that one ). My Mamiya lenses at the same shutter speeds are fine, no issue. Using my Aptus II 7 back on that DF body with those lenses at those shutter speeds do not show the same problem. Using the same lenses with the Aptus II 12 on my second DF body with the adapted lenses do not show the same problem. The batteries used for both the digital back and DF body were swapped between the setup and remained the same, good charge on both and a genuine ( but old ) Leaf battery for the digital back. I am at a bit of a loss as to what is going on; whether the DF body is somehow glitching out in communicating with the Aptus II 12 ( or vice versa ), the digital back is freaking out for whatever reason, or there is another issue there somewhere.
I even dug out my Sony RX100 and recorded the shutter actuating at 1/60s exposure time at 960fps. Even at that speed ( and very noisy video ) you only have a few frames where you can see the shutter actuating ( it's very fast! ), and nothing really seems out of the ordinary.
It bothers me, but it's not a major deal-breaker in any real sense. That body has been relegated to being my back-up now, and it's possible to work around those shutter speeds if I need to. It's just a bit of a shame to have its usefulness severely restricted, and it would be nice to know what's going on.
Photos show the issue at its worst. White balance is set basically permanently at Daylight on the digital back. No adjustments have been made in post, but from experience simply adjusting the Green/Magenta slider will not clear it up completely - the colour does become more normal, but very washed out. I did notice some banding in the sky on one of the purple images after trying to adjust it. Issue clears up completely at 1/125s. Mamiya 35mm is fine at the same shutter speeds.