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Old 08-11-2020, 01:43 PM
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PKay (Peter)
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Alnitak - Magical Mystery Tour

One of the most beautiful stars in the sky.
And hard to get right. One day...

This image is an extract from a large mosaic.

About 4.5 hrs of 60s subs, unity gain.

Apparently, the Beatles smoked a joint (or two) and wrote a few songs.

Try astro processing :-)
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Old 09-11-2020, 07:38 AM
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Robert_T
aiming for 2nd Halley's

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And it is a psychedelic piece of sky! So much going on here i don't think I've seen this framing before and really changes the typical horsehead image. My next serious target i think. Great stuff Peter, can we see the whole mosaic?
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Old 10-11-2020, 06:48 AM
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PKay (Peter)
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Hi Robert

The entire image is here: https://www.iceinspace.com.au/forum/...0&d=1600828721

To some the extract might appear as an over processed cartoon.
However I have been experimenting to solve issues we all face.

1: How to deal with a bright object next to a feint one.

I used tiles so that each area could be exposed differently.
ie: the Star is a different tile to the Nebula.

2: How to acheive and retain colour.
I am developing a technique using incremental stretching (lets say 5 steps).
At each step I save off a copy and can then use it to get colour samples.
The samples are then used in the final result.

A lot of stuffing around, and the extract is a result of the above techniques.

Anyway, last night was so clear guiding accuracy was down to fractions of an arc secound, and I had the lowest HFR ever!
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