Long Exposure a7ii. Question about noise with photos

[FF Pro]

I hiked up to Grotto Falls in the Great Smoky Mountain National Park and got a photo. The Falls is a heavily visited spot so I had to take two long exposures, mask, and get the people out. I was amazed I could do it with just two shots.

Regardless, I import the RAW's into LR6/CC and I see these little red dust spots in the dark areas. See left middle of photo. I have not seen this before with the a7ii. I took some underexposed photos in NYC a few months back and nothing like this. Long Exposure was "On" in NYC.

I do believe I took these with Long Exposure NR "Off". With Canon this is how I shoot and I take care of noise in PP but this is unlike anything I have encountered.

Does Long Exposure NR work on RAW's with the Sony?

Thoughts?





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http://www.14fps.tv - My YouTube channel with a focus on Sony cameras.

 

[JimKasson]

Does Long Exposure NR work on RAW's with the Sony?

Yes. It does dark frame subtraction and applies some secret sauce.

Jim

 

[FF Pro]

Thanks Jim. That clears that up. That is some good secret sauce because there is NO trace of anything like this in my other LE photos. I appreciate the quick response.

 

[FF Pro]

Jim, I hiked to a water fall today and shot long exposures per my normal routine. This time I had Long Exposure Noise Reduction turned on. I now know if I shoot a three minute shot, I have to wait no less than three minutes after the shot for the dark frame portion.

My shots looked fine today but when I went to NYC a few months back I shot with LE NR "OFF". I did not have any of the red noise as seen above. Is this due to grossly underexposed areas in my photo above?

I have always relied on third party solutions for LE NR (DFine being one example) with my Canon gear and am just trying to understand my results on my Sony.

Many thanks in advance for any insight you can provide me.

 

[FF Pro]

Opening the the same Sony raw file in Capture One Express for Sony, I can not find any of the noise I see in Adobe LR. I have zoomed in as far as C1 will allow and nothing. It is as clean as anything. For this reason alone, I am now taking a really hard look at C1 Pro instead of Adobe LR. That is amazing.

My question regarding this is simple. Is it the raw convertor or is it something else? I just opened the file and performed no alterations to the photo. Simply amazing.

 

[Astrophotographer 10]

This issue was brought up in another thread.

It may be the bad/hot pixel map needs updating. The fix is to change the date to 2 month into the future then turn the camera off and then back on and change the date back.

Its an auto feature to once a month or so update the bad pixel map which is subtracted from images. It appears to have not been updated in the factory. Chances are this will be sorted on their production line quickly.

See if that helps.

Greg.

 

[FF Pro]

I am talking about the a7ii and not the a7Rii.

Does this still apply?

 

[FF Pro]

I did it anyway. It defiantly took a frame after turning off. Thanks for the tip regardless. I read it in another thread but I was baffled as my NYC long exposure photos were great (LENR turned off in-camera) but these did not. Capture One Express for Sony still did a great job with the RAW file. Made Adobe LR look pretty stupid.