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Author Topic: Solar Flats  (Read 903 times)

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Offline Roger B

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Solar Flats
« on: 17:25:26, 20 July, 2016 »
Ok I get it for a fully illuminated CCD flat but what about a flat when imaging the limb ?


Rog
Scopes - TS65q, W/O 110 Triplet
Mount - EQ6 PRO via  Eqmod,  Rowan belt modded
Cameras - SX694, QSI583WSG,Lodestar Guidecam, GP-Cam, QHY5II.
TS 9mm OAG
Quantum 7x1.25 EFW, Baader LRGB,Ha,OIII,SII Filters 
Quark chromo

SGPro, Pixinsight.

************AND NO TIME TO USE IT************

Offline chris.bailey

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Re: Solar Flats
« Reply #1 on: 18:20:47, 20 July, 2016 »
Same thing. Set up the gain and gamma you are going to use for the limb exposure. Set the Controls for the Heart of the Sun (Floyd Ref) i.e. slew to the centre'ish, adjust exposure only to get down to around 70% defocus and do the flat, slew back to the limb and bring the exposure back up and off you go.

Chris

ps I do find the Quark wanders a bit so you do end up doing flats every 10-15 minutes.
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 Roger B

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Re: Solar Flats
« Reply #2 on: 18:45:48, 20 July, 2016 »
Cheers Chris,

Wish I knew that after 50gb worth of AVI's from this afternoon.     

I think I'll stick to DSO's    I have a better idea on what to do

Rog
Scopes - TS65q, W/O 110 Triplet
Mount - EQ6 PRO via  Eqmod,  Rowan belt modded
Cameras - SX694, QSI583WSG,Lodestar Guidecam, GP-Cam, QHY5II.
TS 9mm OAG
Quantum 7x1.25 EFW, Baader LRGB,Ha,OIII,SII Filters 
Quark chromo

SGPro, Pixinsight.

************AND NO TIME TO USE IT************

Offline psjshep

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Re: Solar Flats
« Reply #3 on: 18:48:13, 20 July, 2016 »
to be honest, Rog... I haven't noticed that it wanders enough that PI can't do a minor adjust....

Phil

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Offline chris.bailey

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Re: Solar Flats
« Reply #4 on: 19:29:00, 20 July, 2016 »
Rog

Still worth having a play with them. If you have exposed for disk and prom, the disk bit might show some NR's but thats a fact of life.

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 Roger B

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Re: Solar Flats
« Reply #5 on: 19:50:21, 20 July, 2016 »
I have they seemed to work ok

Thanks
Scopes - TS65q, W/O 110 Triplet
Mount - EQ6 PRO via  Eqmod,  Rowan belt modded
Cameras - SX694, QSI583WSG,Lodestar Guidecam, GP-Cam, QHY5II.
TS 9mm OAG
Quantum 7x1.25 EFW, Baader LRGB,Ha,OIII,SII Filters 
Quark chromo

SGPro, Pixinsight.

************AND NO TIME TO USE IT************

Offline Nomis Elfactem

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Re: Solar Flats
« Reply #6 on: 20:15:51, 20 July, 2016 »
Rog - as Chris says, technically a flat taken on the surface should work just as well with an image of the limb !

Also, if you are having trouble with exposure by heading to the centre of the disk then don't bother... the important thing is that 1) the area is clear of any activity when you defocus and 2) it is evenly illuminated and has a minimum gradient.  For the recent active region I've just moved above it to take my flat and it's worked a treat (for both surface and limb/prom shots).

Stick at it mate - it's no different to DSO imaging and your just on the same learning curve you were 7/8 years ago !!

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

 

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