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Dark Lines on Stack
Mar 27, 2016 07:02:43 #
A little help and advice please. Can anyone tell me what the dark lines are on the stack Ive attached please.
Ive only recently bought the MP-E65 and this is my third stack. The others had dark backgrounds although I did notice a few line across a lighter part of one of them which I removed in Lightroom and thought no more of it. However in this stack they appear to everywhere.
Any help and advice will be gratefully received.
Canon 6D at ISO 100, MP-E65 (set at 1:3), 1/180-sec at f/14, speedlight set at 1/8.
stack of 77 (Zerene Stacker) at 90um steps
Apologies for the quality of the photograph, Im finding this lens enjoyable but difficult to use (i think its all in the lighting).
Ive only recently bought the MP-E65 and this is my third stack. The others had dark backgrounds although I did notice a few line across a lighter part of one of them which I removed in Lightroom and thought no more of it. However in this stack they appear to everywhere.
Any help and advice will be gratefully received.
Canon 6D at ISO 100, MP-E65 (set at 1:3), 1/180-sec at f/14, speedlight set at 1/8.
stack of 77 (Zerene Stacker) at 90um steps
Apologies for the quality of the photograph, Im finding this lens enjoyable but difficult to use (i think its all in the lighting).
Mar 27, 2016 09:22:08 #
Mar 27, 2016 09:42:50 #
might be shadows,my highest fstop so far is f9 with the mpe65. lighting is the key with that lens,i'm still trying to learn it.
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Mar 27, 2016 09:51:08 #
oldtigger wrote:
Sorry but Ive no idea.what is it?
Ive sent a copy to my brother (a retired science teacher), hes pretty good at identifying some of the odd things i photograph. Its about 5mm long and has been cocooned in my conservatory for a couple of weeks, but has only started emerging during the last couple of days.
Mar 27, 2016 09:58:35 #
tinusbum wrote:
Thanks,might be shadows,my highest fstop so far is f9 with the mpe65. lighting is the key with that lens,i'm still trying to learn it.
Mar 27, 2016 10:08:59 #
I checked the download and the pattern of this line of dark blotches appears to repeat though-out the image in varying degrees of density. There is a second (different) repeating pattern toward the bottom and right. What I would like to see is a few of the individual exposures used to make this stack. Has this occurred only when using flash?
Mar 27, 2016 10:29:55 #
LoneRangeFinder wrote:
Thanks LoneRangeFinderI checked the download and the pattern of this line of dark blotches appears to repeat though-out the image in varying degrees of density. There is a second (different) repeating pattern toward the bottom and right. What I would like to see is a few of the individual exposures used to make this stack. Has this occurred only when using flash?
Ive attached two of the original pictures (reformatted from RAW to JPEG).
The shots were taken on location. the specimen was about six feet off the ground so I had my camera and flash on different, fully extended tripods, it took me ages to set up (but then that is half the fun).
I had a few lines on one of my other MP-E65 stacks although I remember having this issue once with my 100mm macro lens although nowhere severe as this one. The majority of my limited macro work has been with dark backgrounds which may be why Ive not noticed this before.
Thanks for taking the time.
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Mar 27, 2016 10:45:37 #
PaulBa wrote:
What is puzzling is that the precise pattern repeats-- but in a random pattern. I had a few lines on one of my other MP-E65 stacks although I remember having this issue once with my 100mm macro lens although nowhere severe as this one. The majority of my limited macro work has been with dark backgrounds which may be why Ive not noticed this before.
I don't see this on the individual shot-- although I do see a few individual spots, so perhaps the stacking created the "line". We may never know exactly what caused this.
So solution? I would suggest a sensor cleaning & opening up to f/5.6 or f/8. Will that eliminate this? Not sure. Good luck & let us know if you discover the "cure"
Mar 27, 2016 10:47:36 #
I wonder if those black lines could be marks, perhaps from the sensor, that are repeated and repeated throughout the stacking in slightly different positions.
Mar 27, 2016 11:29:08 #
Definitely caused by dirt on your sensor. Two solutions, clean sensor or clone out in PP. (That's what I do if there are only a few close to the edges)
Mar 27, 2016 11:41:02 #
LoneRangeFinder wrote:
I just viewed the first single frame. LOTS of dirt spots on sensor. F 14 will make them more visible. ZS does several things when stacking a set of images. One is "scaling" which changes the size of individual frames to make things line up. Another is "rotation". That's what is causing random patterns. ZS can also "shift x & shift y" during the stacking process. All done in the background.What is puzzling is that the precise pattern repeats-- but in a random pattern.
I don't see this on the individual shot-- although I do see a few individual spots, so perhaps the stacking created the "line". We may never know exactly what caused this.
I don't see this on the individual shot-- although I do see a few individual spots, so perhaps the stacking created the "line". We may never know exactly what caused this.
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Mar 27, 2016 12:25:23 #
naturepics43 wrote:
Thanks. That is what I suspected--but did not know for certain. The clue seemed to be that the object was actually not a line but a series of spots. Most of my stacking knowledge is "experiential" and since I keep a clean sensor and stack at f/5.6 to f/8, those were two variables that I noticed. I just viewed the first single frame. LOTS of dirt spots on sensor. F 14 will make them more visible. ZS does several things when stacking a set of images. One is "scaling" which changes the size of individual frames to make things line up. Another is "rotation". That's what is causing random patterns. ZS can also "shift x & shift y" during the stacking process. All done in the background.
FWIW, I'm also relatively new with Zerene-- having started with Helicon. Helicon, in my opinion, has a much more difficult time with scaling.
Mar 27, 2016 12:31:13 #
LoneRangeFinder wrote:
Thanks LoneRangeFinder. Ill get the sensor cleaned.I would suggest a sensor cleaning & opening up to f/5.6 or f/8. Will that eliminate this? Not sure. Good luck & let us know if you discover the "cure"
Mar 27, 2016 12:34:36 #
naturepics43 wrote:
Thanks for taking the time to look at the original naturepics43.I just viewed the first single frame. LOTS of dirt spots on sensor. F 14 will make them more visible. ZS does several things when stacking a set of images. One is "scaling" which changes the size of individual frames to make things line up. Another is "rotation". That's what is causing random patterns. ZS can also "shift x & shift y" during the stacking process. All done in the background.
Ill get the sensor cleaned.
Mar 27, 2016 13:44:12 #
naturepics43 wrote:
This is what I think too. It seems that this was about a 50 image stack.Definitely caused by dirt on your sensor. Two solutions, clean sensor or clone out in PP. (That's what I do if there are only a few close to the edges)
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