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View Full Version here: : Explain this please!


PKay
22-09-2020, 11:41 AM
Here are two images.
At first I thought the artefact beside Alnitak was caused by a rain drop on the primary.

If that was the case, when I slewed the target, the artefact would have stayed in the same place.
However, it has moved with the star!

RB
22-09-2020, 11:49 AM
Internal reflection caused by the brightness of Alnitak.

multiweb
22-09-2020, 12:01 PM
That's not a reflection. That's a reflection :lol:

luka
22-09-2020, 12:07 PM
This^

See how it shifted closer to Alnitak in the second image when Alnitak was moved closer to the centre of the image.

Atmos
22-09-2020, 12:10 PM
https://www.astrobin.com/full/npr2g6/0/

BIG reflection!

PKay
22-09-2020, 12:16 PM
How disappointing.

I spent half an hour cleaning the lens :-)

Not to mention it not being a new star appearing out of thin air...

Can I get rid of it?

glend
22-09-2020, 12:24 PM
Whenever I Image the Horsehead I always frame it so Alnitak is out of the shot, it causes too many issues.

RB
22-09-2020, 12:28 PM
Alnitak?
Not unless you're God.

:lol:

RB
22-09-2020, 12:31 PM
I kinda like it.
Your own private unicorn.
:D

xelasnave
22-09-2020, 12:38 PM
Avoid imaging in the rain.
Alex

multiweb
22-09-2020, 01:43 PM
Offsetting the fov, dithering and a meridian flip.

rustigsmed
22-09-2020, 02:14 PM
:rofl::rofl::rofl::rofl::rofl::rofl ::rofl::rofl::rofl:

hahah love it.

could definitely have a reflection-off competition... we've all been there at some stage - trying to deal with pesky Alnitak.

but yes - some aggressive dithering or even a combo of dithering and alternate framing merged via intersection method.

PKay
22-09-2020, 02:33 PM
Found a solution...

(& thnx Jeff)

Atmos
22-09-2020, 03:32 PM
:lol: :rofl:

multiweb
22-09-2020, 04:03 PM
If you spend a little time in PS you can get rid of it. Zipped the file for you. You can do a better job but you get the idea.

LewisM
22-09-2020, 06:23 PM
That’s a damned Klingon phaser blast...

redbeard
23-09-2020, 03:07 PM
:lol::lol:

redbeard
23-09-2020, 03:08 PM
:rofl::rofl::rofl: