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Old 26-10-2021, 11:09 AM
Stephane
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Light pollution filter

Hi all,

Living in Melbourne, I will need a light pollution filter for (colour) imaging. Any recommendations? I hear the Optolong L-Extreme is excellent - but longer exposures needed (which doesn’t bother me).

Also, which do I need for my potential setup? 1.25 inch or 2 inch? I will be using a DSLR camera (Nikon D7000) with possible upgrade to a dedicated astrophotography camera in the future, and will be hopefully using a Bintel f/5 reflector 200/1000. A coma corrector might also be thrown in the mix.

I don’t want vignetting on the corners, so is it safer to just go 2 inch?

Many thanks,
Stéphane
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  #2  
Old 26-10-2021, 02:53 PM
Startrek (Martin)
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Stephane,
OSC narrowband filters like the L Enhance and L Extreme are tremendous
I use the L Extreme for my OSC ZWO2600MC and the results are outstanding ( my 2600MC has an internal IR / UV cut filter as it’s protective window )
I’m sure Optolong and others make a similar NB filter for your Nikon
I never used a NB filter in my Canon but wish I did as just imaging wide band RGB restricted so many objects during moon phases and my heavy light polluted skies including all those beautiful nebula.
Cheers
Martin
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Old 26-10-2021, 08:26 PM
etill (Elliot)
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The optolong l-pro and the other reputable manufacturers of light pollution filters are more versatile than the duo and tri-band filters that seem to try and replicate narrow band with an OSC, so it depends what you want to image.

Look at the transmission data for each and see if they match your intended targets.

For an OSC go 2 inch, you aren't going to change it often. Filter size only seems to be important when you have to put a bunch in a filter wheel
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Old 26-10-2021, 09:25 PM
Dave882 (David)
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The l-extreme is seriously worth its weight in gold if you’re shooting in osc. I’m using the asi294mc with various sct in a variety of configurations from f1.9 to f10 and the results are fantastic. It really cuts through light pollution like it’s not there. I’m using 1.25” but I have to screw it into the nose otherwise it vignettes too much if in the filter drawer. In hindsight I wish I’d got the 2”.

A good UHC filter and a UV-IR filter is also very useful. But not as useful as some dark sky!!
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Old 27-10-2021, 06:10 AM
JA
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Quote:
Originally Posted by Stephane View Post
Hi all,

Living in Melbourne, I will need a light pollution filter for (colour) imaging. Any recommendations? I hear the Optolong L-Extreme is excellent - but longer exposures needed (which doesn’t bother me).

Also, which do I need for my potential setup? 1.25 inch or 2 inch? I will be using a DSLR camera (Nikon D7000) with possible upgrade to a dedicated astrophotography camera in the future, and will be hopefully using a Bintel f/5 reflector 200/1000. A coma corrector might also be thrown in the mix.

I don’t want vignetting on the corners, so is it safer to just go 2 inch?

Many thanks,
Stéphane
Hi Stephane,

The Nikon D7000 has an APSc sized sensor and with its ~28.3mm sensor diagonal would not suit a 1.25inch type filter without vignetting.

As to a light pollution filter recommendation... Would you want to use it with any lenses or telescopes you currently own? If so, it would be good to know some details of those.

Best
JA

Last edited by JA; 27-10-2021 at 06:21 AM.
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  #6  
Old 29-10-2021, 08:13 PM
Stephane
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Thanks all. I will definitely get the 2 inch filter so as to avoid potential vignetting. I might also upgrade my camera one day, and if I want to continue with OSC, then I need an all-rounder filter.

On Youtube, Cuiv has some amazing duo band processing tips that I can't wait to experiment with.

Many thanks,
Stéphane
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