Hello all,
My recent two images have been shot at 300 sec light subs, and I am seeing evidence of an internal reflection.
scope: 120 Esprit
flattener: 1.0x stock flattener
camera: 2600mc
Images: https://astrob.in/fn47cv/0/
https://astrob.in/m9t379/D/
The first image shows a faint red ring that passes through the galaxy in the widefield version. The second shows a red ring of light that it at the top upper right and is in proximity to the blue star (top right).
Its annoying. To say the least.
At least I think that the artefact may be generated from an internal reflection - and I am guessing that its sourced from the 1.0x flattener within the 120 esprit, and am at a loss about how to fix it. My hypothesis is that some IR light is being reflected and the camera is picking it up. Depending upon the shot the ring of light changes placement in the frame, so likely is an abberation of the combination of the scope, the flattener and the camera. Some have mentioned that perhaps a luminance filter will fix the problem, however the camera (2600 mc) already comes with a IR/UV cut filter before the sensor. Thus I am unclear as to whether duplicating this approach will help. I mean, I could always go ahead and try it, but I thought I should pose the question on the forums first.
My hope is that some of you may have experienced this issue (or something similar) and have come upon a solution. At least I hope this question will generate some thoughts. As I am relatively new to AP, this glitch in my scope's performance is beyond my own experience.
Thanks for your interest... I would be grateful for any input.
Best
Ian
My recent two images have been shot at 300 sec light subs, and I am seeing evidence of an internal reflection.
scope: 120 Esprit
flattener: 1.0x stock flattener
camera: 2600mc
Images: https://astrob.in/fn47cv/0/
https://astrob.in/m9t379/D/
The first image shows a faint red ring that passes through the galaxy in the widefield version. The second shows a red ring of light that it at the top upper right and is in proximity to the blue star (top right).
Its annoying. To say the least.
At least I think that the artefact may be generated from an internal reflection - and I am guessing that its sourced from the 1.0x flattener within the 120 esprit, and am at a loss about how to fix it. My hypothesis is that some IR light is being reflected and the camera is picking it up. Depending upon the shot the ring of light changes placement in the frame, so likely is an abberation of the combination of the scope, the flattener and the camera. Some have mentioned that perhaps a luminance filter will fix the problem, however the camera (2600 mc) already comes with a IR/UV cut filter before the sensor. Thus I am unclear as to whether duplicating this approach will help. I mean, I could always go ahead and try it, but I thought I should pose the question on the forums first.
My hope is that some of you may have experienced this issue (or something similar) and have come upon a solution. At least I hope this question will generate some thoughts. As I am relatively new to AP, this glitch in my scope's performance is beyond my own experience.
Thanks for your interest... I would be grateful for any input.
Best
Ian
Congrats! Best - Thilo
