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Author Topic: Theophilus and surrounds  (Read 403 times)

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Offline Ian Straton

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Theophilus and surrounds
« on: 22:37:57, 02 May, 2017 »
I took advantage of a half hour in the obs last night and got a couple of shots near the terminator.  This one has Theophilus as the principal focus.

Shot using the GPcam and altair capture mounted at prime focus on my 8" newt.

Processing... well as I haven't done much with high frame rate work before I think I have used pretty much everything out there!  Autostakkert to align and stack (and wow it was fast!) Registax for wavelets sharpening, PixInsight for histogram and curves, photoshop for high pass layer overlay and crop. Pretty sure that lot could be way simplified but whatever, it was fun doing it :)

I am really interested in any feedback on this image, as I say, pretty much a whole new capture and processing scenario for me so any points to consider welcome.

Also I noticed during the session that there are a lot of subtle surface relief features in the Mare in the top right of frame (of which I have another shot) but I don't know what they are or if they are named, if anyone knows a research resource for the more obscure features I would be glad to hear about it,  I am keen to do more lunar work but I would like to explore beyond the large impact craters.

Offline Nomis Elfactem

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Re: Theophilus and surrounds
« Reply #1 on: 00:16:28, 03 May, 2017 »
Sounds like you had fun and you have to win the prize for the most pieces of software used in processing an image for sure !

For me it actually looks slightly over exposed (indicated by the saturated white bit on the crater rims and the top left corner)... did you capture at 2 thirds the histogram ?   Do you have a picture of a single unprocessed frame from the .avi ?

S.
Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
Accessories: SX USB Filter Wheel, SX OAG, Baader LRGB Ha SI OII Filters, SharpSky Focuser
Mount: EQ6 (EQMOD), SW Star Adventurer, plus a lot (and I mean a lot) of other bits and pieces

Offline Einari

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Re: Theophilus and surrounds
« Reply #2 on: 07:23:53, 03 May, 2017 »
Yeah, looks a bit overcooked.
Tapio

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Offline Ian Straton

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Re: Theophilus and surrounds
« Reply #3 on: 09:01:21, 03 May, 2017 »
Sounds like you had fun and you have to win the prize for the most pieces of software used in processing an image for sure !

For me it actually looks slightly over exposed (indicated by the saturated white bit on the crater rims and the top left corner)... did you capture at 2 thirds the histogram ?   Do you have a picture of a single unprocessed frame from the .avi ?

S.

I was trying to bring out the relief in the Mare and was worried about capturing too dark for that... but yes, there are several bits that are completely blown (its the same in the original avi), I vaguely remembered about the histogram thing but to be honest I couldn't find how to display it in altair capture, so ended up judging by eye (always dangerous on a computer monitor dimmed to its lowest setting!)

Offline Nomis Elfactem

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Re: Theophilus and surrounds
« Reply #4 on: 12:24:45, 03 May, 2017 »
Ian - The dynamic range of the GPCam is almost certainly sufficient to capture the "dark" detail which you can then bring out with a bit of a stretch... over-exposed bits however you can do nothing about so I personally always air on the side of caution. 

Can't help on Altair Capture I'm afraid... but one way to watch against it is to just make sure the crater rims are grey and not white.. I often do the same when solar imaging... the detail in any darker bits can, as I say, then be pulled out with curves with it locked down at the white end to ensure the rims etc don't again get blown out ;) :thumbup:

Do you have the GP1 or GP2 ?  Hoping to get a mono 2 when Nick gets some more chips  :yes:

S.

Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
Accessories: SX USB Filter Wheel, SX OAG, Baader LRGB Ha SI OII Filters, SharpSky Focuser
Mount: EQ6 (EQMOD), SW Star Adventurer, plus a lot (and I mean a lot) of other bits and pieces

Offline Ian Straton

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Re: Theophilus and surrounds
« Reply #5 on: 14:28:40, 03 May, 2017 »
gpcam 1.. Its the one I won in the star trails competition here :) seems like a nice bit of kit, I just need to work with it to get the best results I can.

On the stacking front I just accepted the autostakkert default of stacking 50% of the captured frames, is there anything to be gained in stacking fewer frames of better quality?

Offline Nomis Elfactem

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Re: Theophilus and surrounds
« Reply #6 on: 14:32:02, 03 May, 2017 »
is there anything to be gained in stacking fewer frames of better quality?
.. yes, sometimes.  50% of how many ?

S.
Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
Accessories: SX USB Filter Wheel, SX OAG, Baader LRGB Ha SI OII Filters, SharpSky Focuser
Mount: EQ6 (EQMOD), SW Star Adventurer, plus a lot (and I mean a lot) of other bits and pieces

Offline chris.bailey

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Re: Theophilus and surrounds
« Reply #7 on: 15:36:31, 03 May, 2017 »
Ian

The GPcam plays very nicely with Firecapture and you can most definitely display a histogram in that, in fact you can have one superimposed along the bottom of the image preview window, lets you see easily when you are approaching clipping. Note that even at 8 or 12 bits captured, as you stack more and more the dynamic range increases. That doesn't help with white clipping but you can easily get to 16 bits or more when you stack a lot of 12 bit frames. http://www.stark-labs.com/craig/resources/Articles-&-Reviews/BitDepthStacking.pdf. That really helps when you come to stretch things out.

In Autostakkert you can set it up to perform a variety of stacks all at the same time. I often do 25,50 and 75% and pick the best out of the three of them.

Chris
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Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

 

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