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Offline Malcolm L

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filters
« on: 21:46:03, 28 February, 2018 »
Good evening everyone on this cold winter night
I just like to ask a question is there a right or a wrong way for imaging through filters

Offline chris.bailey

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Re: filters
« Reply #1 on: 22:19:39, 28 February, 2018 »
Malcolm

Not sure what you are asking but a few thoughts -

1) Dont assume filters are par focal. They may even be pretty much par focal with one scope but not with another.
2) Be organised with what filter is where. Not uncommon to mix R with G or some such.
3) In my view don't try and be clever to achieve colour balance by varying exposure through different filters.
4) Its best to do R when a target is low in the sky and B when it is around its highest BUT that does risk getting R and some G but missing B if it clouds over. I've got the T-Shirt on that one a number of times
5) Try to avoid stacking filters. If you need an LP filter use it in place of the L filter not stacked on top of all of them
6) If there are any refractive elements in the imaging train use L rather than Clear.

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 Malcolm L

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Re: filters
« Reply #2 on: 22:41:49, 28 February, 2018 »
thanks Chris, why am asking is sometimes my image's are very very noisey through filters and am wondering if  I can turn the filters round the other way, I can't see the project am imaging because very speckley thanks for your advice :thumbup: 

Offline Einari

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Re: filters
« Reply #3 on: 05:52:13, 01 March, 2018 »
Tapio

Celestron C8, C9.25" & Hyperstar, iOptron CEM60-EC, TS 80 triplet,  Coronado PST, SXV-694,  ASI120MM/ASI174MC Cool

Offline chris.bailey

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Re: filters
« Reply #4 on: 08:45:19, 01 March, 2018 »
Malcolm

Mounted filters "should" be mounted the correct way around. Unmounted filters normal have a little > engraved on the side to indicate the correct direction of light path.

Filters do attenuate the light so you do need adequate exposures. Noise is not down to the filters but exposure.

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 Malcolm L

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Re: filters
« Reply #5 on: 17:46:04, 01 March, 2018 »
thanks Chris for your advice  :thumbup: & thanks for the web page too :thumbup:

 

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