Banding ?

DeadJohn · 01-31-2018, 09:51 PM

Originally posted by Digitalis

Depending on the coatings on the filter rain droplets would slide down the filter rather quickly - the streaks would be short over a 1/8th second exposure. The lens used was the SMCP-FA 77mm f/1.8 Limited which has a built in lens hood which would shield the filter pretty well. Water is transparent, exactly how are you suggesting rain could leave homogeneously illuminated steaks across the entire image?

The more common issue of light coming in through the viewfinder was already addressed. The OP said the viewfinder was blocked(*). Look for the unusual after the common causes have been ruled out. Water is one possibility; other people might come up with more ideas.

A drop of water might move slowly depending on filter coatings, wind, and other factors. Transparent water refracts and reflects light. If I read the original post correct, shutter speed was 30 seconds rather than 1/8, but that's not especially relevant. The drop speed could match any shutter speed with the correct amount of bad luck.

(*) Edit: I see the OP followed up saying they think it's light in the viewfinder. I guess "blocked" in the top post meant with a hand or something, not fully covered.

Robinta · 02-01-2018, 12:33 PM

Originally posted by DeadJohn

The more common issue of light coming in through the viewfinder was already addressed. The OP said the viewfinder was blocked(*). Look for the unusual after the common causes have been ruled out. Water is one possibility; other people might come up with more ideas.

A drop of water might move slowly depending on filter coatings, wind, and other factors. Transparent water refracts and reflects light. If I read the original post correct, shutter speed was 30 seconds rather than 1/8, but that's not especially relevant. The drop speed could match any shutter speed with the correct amount of bad luck.

(*) Edit: I see the OP followed up saying they think it's light in the viewfinder. I guess "blocked" in the top post meant with a hand or something, not fully covered.

I normally cover the viewfinder with my hand. However as the light was so flat I know for a fact I just stood closer to the camera on a few shots to try and block any stray light with my body..I'm guessing it wasn't enough in this instance.

Thanks to everyone for helping

SKYGZR · 02-01-2018, 03:01 PM

A piece of black electrician's tape..nuth'n fancy required...

**Digitalis** · 02-02-2018, 02:56 AM

Originally posted by Robinta

Due to lightroom throwing a wobbler, the lens isn't the 77mm Pentax, but sigma 17-70.

I have tons of mislabeled Images in my LR library - and this isn't just an issue with Pentax lenses sadly.

Penview52 · 02-02-2018, 07:08 AM

Banding is caused by either long exposure noise at high ISO or caused by sensor posturization occur between bit transitions. Generally viewed as incorrect focus.This occurs as horizontal or vertical lines and sometimes magnified if using low class SD card. Post processing can remove these lines.

**Bob 256** · 02-02-2018, 08:36 AM

The only other thing that comes to mind is something affecting the shutter and that the shutter slit didn't make a smooth pass across the film (sensor) plane, but this was a time exposure. Stray light in the viewfinder.

Penview52 · 02-02-2018, 02:35 PM

Viewfinder has no implication on color banding. It is purely camera sensors capability ( bit transition ).

See related site regarding color banding'

Colour banding - Wikipedia

If you have taken a photo with banding, take again and again without changing any settings and you will notice that not all photo has banding. Also banding occurs for photo taken during night time or no light from sun or other sources that can illuminate the viewfinder, but as I said not all photo taken has banding colors. This would mean that focus or exposure taken is at faulty settings amplified by sensors capability.

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01-31-2018, 09:51 PM	#16
DeadJohn Pentaxian Join Date: Jan 2011 Location: New York Posts: 4,834	Originally posted by Digitalis Depending on the coatings on the filter rain droplets would slide down the filter rather quickly - the streaks would be short over a 1/8th second exposure. The lens used was the SMCP-FA 77mm f/1.8 Limited which has a built in lens hood which would shield the filter pretty well. Water is transparent, exactly how are you suggesting rain could leave homogeneously illuminated steaks across the entire image? The more common issue of light coming in through the viewfinder was already addressed. The OP said the viewfinder was blocked(). Look for the unusual after the common causes have been ruled out. Water is one possibility; other people might come up with more ideas. A drop of water might move slowly depending on filter coatings, wind, and other factors. Transparent water refracts and reflects light. If I read the original post correct, shutter speed was 30 seconds rather than 1/8, but that's not especially relevant. The drop speed could match any shutter speed with the correct amount of bad luck. () Edit: I see the OP followed up saying they think it's light in the viewfinder. I guess "blocked" in the top post meant with a hand or something, not fully covered.

02-01-2018, 12:33 PM	#17
Robinta Junior Member Join Date: Dec 2015 Location: Sunderland Photos: Gallery Posts: 25 Original Poster	Originally posted by DeadJohn The more common issue of light coming in through the viewfinder was already addressed. The OP said the viewfinder was blocked(). Look for the unusual after the common causes have been ruled out. Water is one possibility; other people might come up with more ideas. A drop of water might move slowly depending on filter coatings, wind, and other factors. Transparent water refracts and reflects light. If I read the original post correct, shutter speed was 30 seconds rather than 1/8, but that's not especially relevant. The drop speed could match any shutter speed with the correct amount of bad luck. () Edit: I see the OP followed up saying they think it's light in the viewfinder. I guess "blocked" in the top post meant with a hand or something, not fully covered. I normally cover the viewfinder with my hand. However as the light was so flat I know for a fact I just stood closer to the camera on a few shots to try and block any stray light with my body..I'm guessing it wasn't enough in this instance. Thanks to everyone for helping

02-01-2018, 03:01 PM	#18
SKYGZR Senior Member Join Date: Dec 2014 Location: Milky Way Galaxy, Planet Earth, Speeding towards the Virgo Supercluster Photos: Gallery \| Albums Posts: 156	A piece of black electrician's tape..nuth'n fancy required...

02-02-2018, 02:56 AM	#19
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	Originally posted by Robinta Due to lightroom throwing a wobbler, the lens isn't the 77mm Pentax, but sigma 17-70. I have tons of mislabeled Images in my LR library - and this isn't just an issue with Pentax lenses sadly.

02-02-2018, 07:08 AM	#20
Penview52 Veteran Member Join Date: Apr 2017 Photos: Albums Posts: 327	Banding is caused by either long exposure noise at high ISO or caused by sensor posturization occur between bit transitions. Generally viewed as incorrect focus.This occurs as horizontal or vertical lines and sometimes magnified if using low class SD card. Post processing can remove these lines.

02-02-2018, 08:36 AM	#21
Bob 256 Site Supporter Join Date: Jun 2008 Location: Idaho Photos: Gallery Posts: 2,378	The only other thing that comes to mind is something affecting the shutter and that the shutter slit didn't make a smooth pass across the film (sensor) plane, but this was a time exposure. Stray light in the viewfinder.

02-02-2018, 02:35 PM	#22
Penview52 Veteran Member Join Date: Apr 2017 Photos: Albums Posts: 327	Viewfinder has no implication on color banding. It is purely camera sensors capability ( bit transition ). See related site regarding color banding' Colour banding - Wikipedia If you have taken a photo with banding, take again and again without changing any settings and you will notice that not all photo has banding. Also banding occurs for photo taken during night time or no light from sun or other sources that can illuminate the viewfinder, but as I said not all photo taken has banding colors. This would mean that focus or exposure taken is at faulty settings amplified by sensors capability.