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UHC Filter Size?

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#1 Shepdog

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Posted 16 April 2021 - 07:46 PM

Hello,

 

Im going to get a Lumicon UHC filter, but dont know enough to choose the size. The 1.25 seems more practical as I only have one 2 inch EP...but I will upgrade to 2 inch EP's if needed for the best view. Love the one 2 inch EP I have and use a 2 inch coma corrector.

 

In case it matters,,I am using a 12 inch dob and imaging with a cell phone..



#2 brentknight

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Posted 16 April 2021 - 08:00 PM

Get the 2" size and attach to the CC.
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#3 Shepdog

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Posted 16 April 2021 - 08:10 PM

Thank you Brent...is there a cheaper brand as good?



#4 brentknight

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Posted 16 April 2021 - 08:15 PM

I don't have one, but I have heard good things about the DGM narrowband.

 

DGM @ EyepiecesETC

 

We have a saying here: "Buy once, Cry once".  You get what you pay for - and I know Lumicon, Tele Vue and very likely DGM are worth the cost.


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#5 ButterFly

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Posted 16 April 2021 - 09:13 PM


In case it matters,,I am using a 12 inch dob and imaging with a cell phone..

A dob and a filter slide are great together.  Something I hadn't considered when buying was focal shift when going from one filter to the next.  My Lumicons (UHC, OIII, H-beta) are all parfocal, and my Astronomiks (642, 6/12 nm h-alpha) are parfocal, but not with the Baader UHC or each other.  It depends mostly on the thickness of the glass used to make the filter.  Sticking to one company may increase your chances of parfocal, but there is no guarantee.

 

Avoid the UHCs with h-alpha as well if you will be imaging.  The h-alpha does very little visually anyway, except on stars.  You won't be let down with any of the high transmission narrow band filters.  Availability may be your biggest costraint right now.

 

Certainly 2".
 



#6 Phishin_phool

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Posted 16 April 2021 - 10:06 PM

I have the DGM NPB and am quite pleased with it.




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