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p.1 #1 · p.1 #1 · X-T2 hot pixels, LensCap test, Iso Invariance and X-Trans | |
I know.. a lot of topics but it is all inter-related. Stick with me.
I took a picture of pre-dawn that was pretty dark in the foreground. I used a gradient to push the exposure +2.5 and got a bunch of hot pixels that I ended up having to clone out. Way more than I ever had on any of my canons (10D, 5D, 5D3). (But of course I could never push the Canons +2 without banding/blocking but that is a diff story and issue).
Having read about X-T2 and how great it was re: ISO Invariance I decided to try a lens cap test. Image at iso200, f/5.6, 2 second exposure. Imported the raf file into LR and created a copy then pushed the copy up +5 on the exposure with sharpening at 30. The un-pushed image I can see only 1 hot pixel at 100%. The +5 image I can see 80-100 red, blue, green white pixels. Is this normal for an X-T2 sensor? It seems very well controlled at exposure but when pushed holy moly.
So next thing I did was process the raf with X-Tran using all the default settings and then I pushed it +5. Uh oh.. I think if you X-Tran your RAF then you need to forget about ISO Invariance and pushing much or I am doing something seriously wrong to even try this. The whole image lightens up where the blacks become purplish and there is a massive "Purple Sand Bloom" (not sure what to call it).
So I'm interested in if anyone else has tried this.
1. Take a lens cap image with settings as above. Open in LR and set sharpening to 30 and push +5 on exposure. Compare the raf to the pushed copy and see if you get lots of hot pixels.
2. Then do an X-Tran conversion of the raf and push it +5 and see what you get.Do you lose all black in a field of purple sand? I can get rid of the sand by applying massive luminance noise reduction but don't think that is an option with a real image and the image is still purple and lighter than the RAF +5
I'm interested in hearing if anyone else has the same issue with so many hot pixels when pushing and if you think X-Tran basically kills the ability to push exposure in an ISO Invariance way as I have concluded (at least using default settings).
Thanks,
Rick
Left side LR, Right side LR+5 exposure
Left side LR + 5 Exposure, Right side XTran + 5 Exposure
default X-Tran settings
Left side X-Tran +5, Right side LR +5 showing lighter, purple in xtran side
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