Amp-glow issue on my K-1 Mk II ?

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Dan Paris Contributing Member • Posts: 673
Amp-glow issue on my K-1 Mk II ?

Hi,

I find that my K-1 Mark II has a lot of ampglow, maybe more than it should be.

Ampglow manifests itself as a magenta glow at the bottom of the image when the exposure of an underexposed image is pushed during RAW developpement.

On my copy, at ISO 800 for instance, it starts becoming annoying at only +2EV so it affects no only astro pictures but also ordinary ones.

Here is a dark frame (ISO 800, 20 sec) pushed +3 EV with +30% contrast/brightness :

Here is what it does to the image in the same parameters (800 ISO +3EV push). This time the exposure is only 3 sec:

there's a workaround (substracting dark frames) but it is not very convenient and the noise it not removed.

I don't see this in the DPREVIEW review, see https://www.dpreview.com/reviews/pentax-k-1-ii-review/6, ISO-invariance test

It may be that my copy is defective, and it would be very helpful for me if you could test your K-1 II in similar conditions (ISO 800, +3EV push, raise luminosity/contrast) to check whether I should send mine for repair (still under warranty fortunately)

Dan

 Dan Paris's gear list:Dan Paris's gear list
Sigma DP1 Merrill Sigma DP2 Merrill Ricoh GR II Pentax K-1 II Pentax smc FA 31mm F1.8 AL Limited +7 more
Pentax K-1
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