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It sounds like you have the camera’s ‘dark frame’ noise reduction turned on. Try turning off all of the various noise reduction options and you should be able to use your intervalometer to shoot back to back frames and then later get the dark frames and bias frames for processing. Just a thought, you may want to set your intervalometer to have a brief pause (say ten or 15 seconds) between frames to let the sensor cool a bit, — this may help reduce those pesky hot pixel problems.

I would encourage you to consider the 50 f2. I think the 23/50 combination makes a nice pairing. The 50 f2 is weather resistant, focuses fast and takes nice portraits and detail shots. Images from one to the other would share a common “look” IQ wise. You did say you wanted the 1.2 or 1.4 and if you have your heart set on the faster 1.4/1.2, the 56 would give you a 23/56 pairing, equivalent of a classic 35/85 combination. Hard to beat for your stated purposes. I do have the 23, 35 and 50 f2 and I tend to use my 35 as a stand-alone lens for when I don’t want to bother with or worry about changing out lenses. Best of luck with your decision, Dave

heavy stuff, but which one is the heaviest...

Thank you both for the replies. I appreciate you taking the time to replicate the issue on your cameras. It makes me feel more comfortable to know that it's something inherent to the camera and not a defect (unless we all have defective cameras lol).

don't sell a lens you love!