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So what's going on here?

Started Sep 3, 2019 | Discussions thread
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AudiiDudii
AudiiDudii Contributing Member • Posts: 816
So what's going on here?

Last fall, I successfully converted my NX500 to full-spectrum operation by removing the cover glass / dust shaker mechanism and have been happily photographing with it ever since using a Hoya R72 (720 nm) filter ahead of the lens.

For both my daytime and nighttime photography, the following problem isn't an issue, because it doesn't occur for exposures shorter than 1/60 or longer than five seconds.

But I've recently started photographing at sunrise and sunset as well, which sometimes calls for exposures that fall within the 1/60 to five-second exposure range, at which point, this happens:

These photos were taken earlier this morning.  The exposure for the photo above was four seconds whereas the exposure for the photo below was five seconds.

The two photos were taken consecutively and only a few seconds apart ... any ideas as to what is causing the (for lack of a better term, because it's nothing like the usual hot spots that sometimes occur when photographing with infrared light) "hot spot"?

Any input will be greatly appreciated!

Samsung NX500
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