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Author Topic: bias and flat  (Read 926 times)

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Offline chris.bailey

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Re: bias and flat
« Reply #1 on: 16:47:59, 30 March, 2017 »
Clive

Any chance of a light frame too?

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
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

Offline chris.bailey

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Re: bias and flat
« Reply #2 on: 16:54:11, 30 March, 2017 »
Clive

Any chance of a light frame too?

Chris

ps flats look a little underexposed to me
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
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

Online clive

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Re: bias and flat
« Reply #3 on: 18:13:40, 30 March, 2017 »
Lite frames  ready chris for looking at

Offline chris.bailey

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Re: bias and flat
« Reply #4 on: 19:04:47, 30 March, 2017 »
Clive

Yes, for some reason you flat frames on this occasion have very low signal levels, not much more than the lights so I think it is an issue with the flats.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
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

Online clive

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Re: bias and flat
« Reply #5 on: 19:43:00, 30 March, 2017 »
ok chris next clear nite ill give it another trie my photo shop was nt set to adob 1998 dont nknow if thats got a berring on it  cs4 was on this setting s .rgb iec6 1966 .21  in colour settings

Offline chris.bailey

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Re: bias and flat
« Reply #6 on: 22:07:13, 30 March, 2017 »
Clive

Adobe RGB vs sRGB should not make a difference as all calibration is done on the RAW file.

If I were you I would try redoing flats now. You don't have too many dust bunnies so they may be a decent match and it would be good practice.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
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

Online clive

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Re: bias and flat
« Reply #7 on: 13:46:46, 31 March, 2017 »
I did another set of flats  stacked  still very bad gradiants  this time i used manual on my 6 d the red histogram was three quarters blue   green  were far to the left but not touching far left so this time they were not under exposed  my last few images flats worked  when i use   arpeture priority av i cant get the red histogram from being under exposed  strange checked all  6d setings  one of the  6d setings was adobe rgb  so i put 6d back  s rgb i checked on inter net   i dont know if it would make a differance ill carry on experementing

Offline chris.bailey

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Re: bias and flat
« Reply #8 on: 17:24:57, 31 March, 2017 »
Clive

What are you using as a light source? Might be an idea to try some sky flats and see if you can get a more balanced histogram. You really want a decent signal in all three channels.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
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

Online clive

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Re: bias and flat
« Reply #9 on: 18:04:25, 31 March, 2017 »
Hi chris i use flat field pannel and a white defuser in front of my pannel to dim the lite a bit because cant adjust the lite out put  last time i imaged flats worked some   what  never done sky flats could try them  ive receieved a nice book  photo shop astronomy ill learn to process the bad gradiants out  i did have a bash earlar my triplet did look better  ill study the book as much as i can help to process  flats out

 

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