Yes, I saw such effects before, while using the electronic shutter with my
Panasonic GX7 (bought years ago for silent theater shooting).
Cheers,
Dario
-----Messaggio originale-----
From: Mark C
Sent: Thursday, March 02, 2017 8:47 PM
To: Pentax-Discuss Mail List
Subject: K-1 Banding abd RAW file Issues
A couple things I learned about the K-1 and Pixel Shift Mode:
The banding I was experiencing is the result of the electronic shutter
and artificial light. It's just a rolling shutter effect. I saw it in
Pixel Shift mode since that uses the electronic shutter, but setting the
camera to use the electronic shutter in standard resolution / live view
mode will also produce the banding. With the incandescent bulbs I used
in the test, the banding was worse at higher shutter speeds but seemed
to disappear at speeds of 1/15th or slower. Here's an extreme example -
pointed the camera directly at a 30W mini flood light and shot at 1/8000
/ f2.8:
http://www.markcassino.com/b2evolution/index.php/pentax-k-1-banding?blog=9
So, I have to figure out some form of lighting that will not cause
banding. The incandescent bulbs that I tried seem to be the worst
offenders, so I'll go back to LED's. I was thinking that DC powered
LED's would not flicker, but testing that theory on some DC powered
led's in the house showed that they do. I do have some led flashlights
that do not produce banding. And there's an old propane lantern around
here somewhere...
The other thing that I learned (which is actually rather embarrassing)
is that I had not actually seen any pixel shift results till today. I'm
using PS CS6 and ACR 9.1.1. K-1 DNG raw files open just fine in ACR
9.1.1 but the pixel-shift magic does not happen. Apparently you need ACR
9.5 or higher before the pixel shift enhancement takes place. Compared
to in-camera JPGs or DNG's processed in silky pix, the difference is
very clear. So while I was impressed with the results I was getting with
the K-1, all I was seeing was the improvement inherent in the sensor
itself and not pixel shift resolution.
ACR 9.1.1 is the last release that works with Photoshop CS6, so I either
have to update, start using SilkyPix or shoot JPG's. I just figured out
how to do batch processing in SilkyPix and will use that for the time
being.
Mark
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