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Astrophotographer 10
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No they don't. Not like that. I have used XT1 and its very clean.
Any camera will have some noise but this more like hot pixels showing up. I read that Capture 1 RAW conversion got rid of it.
Also there was some possibility that updating the bad pixel map also helped. Not sure about that last as it seems to vary with exposure.
Greg.
Any camera will have some noise but this more like hot pixels showing up. I read that Capture 1 RAW conversion got rid of it.
Also there was some possibility that updating the bad pixel map also helped. Not sure about that last as it seems to vary with exposure.
Greg.
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+1.
Yes its unexpected. I thought with the BSI sensor etc etc that it would be super clean.
Its put a dampener on my wanting one. Hopefully better fixes will be reported or Sony will update the firmware. Perhaps the hot pixel suppression on a7R is much better.
Greg.
Yes its unexpected. I thought with the BSI sensor etc etc that it would be super clean.
Its put a dampener on my wanting one. Hopefully better fixes will be reported or Sony will update the firmware. Perhaps the hot pixel suppression on a7R is much better.
Greg.
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Interesting. It was noted that BSI sensors generally have a higher failure rate in production. I wonder if standards are lower and a few bad ones are getting through.
In the CCDworld sensors are rated by the number of hot pixels and Class 1 is the highest grade and engineering class the lowest. So not all sensors are equal.
Greg.
In the CCDworld sensors are rated by the number of hot pixels and Class 1 is the highest grade and engineering class the lowest. So not all sensors are equal.
Greg.
Tristimulus
Veteran Member
Thermal noise also increase with increasing temperatures. So shooting in hot conditions NR should be used. Not so critical in a colder climate.
Have been using a Canon 60Da for astrophotography for a few years and in mild nights the confetti noise is more carnival style. Cold nights are confetti free.
My A7 is somewhere in between but this camera is not a night sky champion. Use it for all my ordinary photography. Seems like the A7RII is a terrific camera for absolutely everything but long exposures in hot or moderate temperatures.
Have been using a Canon 60Da for astrophotography for a few years and in mild nights the confetti noise is more carnival style. Cold nights are confetti free.
My A7 is somewhere in between but this camera is not a night sky champion. Use it for all my ordinary photography. Seems like the A7RII is a terrific camera for absolutely everything but long exposures in hot or moderate temperatures.
241Photography
Well-known member
I wonder if this is in fact a LR6 and Photoshop CC 2015 issue. I have shot a wedding beginning of July with my 6D and even though the some of the images look clean in LR6 on screen, as soon as I export them to Photoshop CC 2015 they look really noisy.
I downloaded secondclaw's ARW file and opened it in Photoshop ACR, looks OK on the screen but as soon as I hit the open image button, the image in Photoshop itself looks terrible.
I am looking at the A7Rii as my next camera keeping my L glass as the 6D has now done nearly 100k and I think I should make it my back-up.
I downloaded secondclaw's ARW file and opened it in Photoshop ACR, looks OK on the screen but as soon as I hit the open image button, the image in Photoshop itself looks terrible.
I am looking at the A7Rii as my next camera keeping my L glass as the 6D has now done nearly 100k and I think I should make it my back-up.
secondclaw
Well-known member
I tried it with C1 (Sony edition) and it doesn't look any better. Also, while I use PS6, the problem was apparent in LR6 as well. It's also quiet visible on camera's LCD during the preview.
Really the answer for anyone that's OK with it is to use LENR. For me, it means in a single hour of night-time shooting I can take half as many photos as I would with A7R ...
Really the answer for anyone that's OK with it is to use LENR. For me, it means in a single hour of night-time shooting I can take half as many photos as I would with A7R ...
241Photography
Well-known member
When I opened your ARW file in Photoshop ACR it looked quite clean, until I clicked the open image button at the bottom. What appeared in Photoshop was like someone had been sick after eating a pack of skittles.
brudy
Senior Member
I think what you're seeing is the embedded jpeg preview in the raw file, which is using the jpeg settings in the camera, so certain things like LENR, sharpness, etc might be applied.
Nor is it terrific for action. AF issues with the adapted Canons and limited range of native long lenses....
But the longer the exposure, the more you need LENR.
Not using it seems to me to be like switching off IBIS and OSS and then complaining of camera shake.
I bet the A7r shots also benefit from LENR, if you have the patience to use it.
secondclaw
Well-known member
I don't use it on A7R - at all. If this new sensor requires LENR to function properly, then it cuts amount of photos I can shoot in half. Still reason to return it.
If all cameras required LENR, then fine - there wouldn't be much of a choice. But since A7R doesn't require it, then it will be my tool for night-time and long exposure photography (where A7R2's improvements such as IBIS are hardly important). And in that case, A7R2 is not a replacement for A7R, but an additional camera. And I'm not interested in keeping both.
If all cameras required LENR, then fine - there wouldn't be much of a choice. But since A7R doesn't require it, then it will be my tool for night-time and long exposure photography (where A7R2's improvements such as IBIS are hardly important). And in that case, A7R2 is not a replacement for A7R, but an additional camera. And I'm not interested in keeping both.
secondclaw
Well-known member
Perhaps. That's how I started when I got A7R (was always using it on Canon). Then one day I compared them and found no difference worthy doubling my shooting time, and turned it off. Since then I have taken many long exposure photos, including some 8-minute ones, and I never once was compelled to re-enable LENR.
I would generally use LENR for high-ISO long exposures - I actually expect noise, but A7R trained me to expect clean long-exposure photos at base ISO.
I would generally use LENR for high-ISO long exposures - I actually expect noise, but A7R trained me to expect clean long-exposure photos at base ISO.
Andrea Visconti
Well-known member
Mine doesn't. I've shot often with times between 1min and more than 30min with my Canon 1D mkIII, Canon 350D and Fuji X pro1 and even the venerable 350D does much better than that!
Everythingis1
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Hot pixels are a one click fix depending on your PP software of choice.
Tons o Glass
Senior Member
I have read a few threads like this here, and there seems to be an in-camera fix provided that the warm/hot pixels are consistent from photo to photo. It involves forcing the camera to map hot pixels. It's worth a shot!
http://www.dpreview.com/forums/post/56284904
For long exposures such as this, it has also been suggested to reduce potential sources of heat if it is thermal noise. This includes turning IBIS off and turning the display off or pulling it away from the body.
secondclaw
Well-known member
As far as I understand it, the remapping feature is for 'stuck' pixels - those pixels that show up as 'on' at any exposure. Heat noise pixels cannot get removed this way.
As far as reducing heat, for my test I pulled out the LCD to allow better air circulation, disabled IBIS, and disabled auto-focus. Didn't help.
As far as reducing heat, for my test I pulled out the LCD to allow better air circulation, disabled IBIS, and disabled auto-focus. Didn't help.
Tristimulus
Veteran Member
AF issues with adapted Canon lenses is an adapter/lens issue. Lack of native long lenses. Not a camera issue per se...
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