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I'm looking for a good nebula filter

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#1 DougColeman

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Posted 01 August 2014 - 03:14 PM

My next purchase is probably going to be a nebula filter, and I have two questions:

1) Since I own both 2" and 1.25" eyepieces, could I purchase just a single 2" filter and use it with all my eyepieces if it can be threaded into the 2"-1.25" adapter? This might seem like a silly question, but I'd like to purchase just one good filter if I can get away with it, rather than have to get two in different sizes.

2) Any good recommendations? I'm looking for a bang-for-your-buck (not budget, but I'm not rich either) UHC filter.

#2 Scanning4Comets

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Posted 01 August 2014 - 03:27 PM

Bang-for-the-buck UHC type filter is an Orion Ultrablock. You can use it in your 2"-1.25" adapter, but just be careful and make sure the 1.25" barrel does NOT protrude too far into the adapter, or it could HIT the filter and damage / scratch it.

You can use a small rubber o-ring on the 1.25" barrel of your eyepiece to stop it from going too deep into the adapter.

CS!

#3 paul hart

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Posted 01 August 2014 - 03:36 PM

I have the Orion Ultrablock. I picked it up on sale several years ago and like it. The Ultrablocks are rated fairly well and I have no complaints. David K. is the filter guru and I would think he will chime in. I have both sizes but my original purchase was the 1.25 as most of my eyepieces were that size. Since then I use filter slides which take 2 inch filters and keep the 1.25 for my finder which doubles as a RFT.

#4 REC

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Posted 01 August 2014 - 03:38 PM

DGM NPB 2" is a very good one and $160.

#5 David Knisely

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Posted 01 August 2014 - 03:48 PM

My next purchase is probably going to be a nebula filter, and I have two questions:

1) Since I own both 2" and 1.25" eyepieces, could I purchase just a single 2" filter and use it with all my eyepieces if it can be threaded into the 2"-1.25" adapter? This might seem like a silly question, but I'd like to purchase just one good filter if I can get away with it, rather than have to get two in different sizes.

2) Any good recommendations? I'm looking for a bang-for-your-buck (not budget, but I'm not rich either) UHC filter.


Yes, get a good narrow-band nebula filter like the DGM Optics NPB (my first choice), Lumicon UHC (the "original" UHC), Thousand Oaks Narrowband LP-2, or Orion Ultrablock. I also use 2" filters in my 2" to 1.25" threaded adapter, although you do have to be careful with some eyepieces that have long barrels to make certain that your adapter does not allow the end of the barrel to hit the filter surface. I also thread my 2" filters in the front of my Dob's Paracorr, so I can switch eyepieces without having to move the filter from eyepiece to eyepiece. For more information about filters, the following article may be of some use:

USEFUL FILTERS FOR VIEWING DEEP-SKY OBJECTS

Good luck and clear skies to you.
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#6 Illinois

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Posted 02 August 2014 - 07:41 AM

David Knisely....Thanks for post and good information about useful filter for viewing deep sky objects! :waytogo:

#7 Brian Carter

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Posted 02 August 2014 - 09:52 AM

I agree with everyone else, just the 2" will work. You might find that you only use it with your 2" eyepieces. These filters work best at lower magnifications. My OIII is best at my lowest magnification, 5x per inch of aperture. The ultra block/uhc can go a little higher. It's not that they are useless at higher magnifications, just not as effective.

Good luck choosing!

#8 Scanning4Comets

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Posted 02 August 2014 - 12:00 PM

I've used a Lumicon O-III with excellent results at 12x per inch of aperture. It all depends on what you are looking at. I was looking at M-97 with a Lumicon O-III and a 10mm Delos and the field was still not dark and the views were excellent!

Lower powers in an O-III are indeed the best....but you can go to medium powers as well.

#9 DougColeman

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Posted 02 August 2014 - 12:04 PM

Thanks all, especially David!

#10 DougColeman

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Posted 02 August 2014 - 12:04 PM

Thanks all, especially David!

#11 Mariner@sg

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Posted 04 August 2014 - 03:49 AM

Not sure if this is applicable to all but the filter should be able to screw into the 2" diagonal. Alternative is to use filter slides/wheels adapted for visual use.



#12 audioaficionado

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Posted 04 August 2014 - 05:28 PM

The Orion set looks like the best bang for the buck. Lumicon if you want the very best and are willing to pay 2x.
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#13 WesC

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Posted 04 August 2014 - 07:45 PM

I dunno if this is weird, but I thread my Lumicon UHC into the nose of my 2" Baader click-lock diagonal. Then I can swap EPs and the filter stays put.

 

BTW, love this filter!



#14 Scanning4Comets

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Posted 04 August 2014 - 08:08 PM

I leave my filters screwed onto the end of an extension tube and use it that way with my eyepieces. Sure beats threading it in the dark!

 

:like:


Edited by Scanning4Comets, 04 August 2014 - 08:08 PM.


#15 Starman81

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Posted 05 August 2014 - 12:11 AM

I love the DGM NPB as well, so that's what I would suggest. I had a Earthwin Power/Filter Slide that I had the NPB alongside a DGM OIII and for most objects that *I* looked at, the NPB was the winner. However, that is obviously highly object-dependent. 

 

I like Markus' idea of having filters screwed on the end of an extension tube. Easier to use and that way you can use 2" filters for all your eyepieces. 2" filters do cost more, but you typically use filters at lower powers anyway so the 2" route makes sense for most. 



#16 Scanning4Comets

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Posted 05 August 2014 - 02:20 AM

I "used to" use a 2" ext tube.

 

Not any more......now it will be on the end of a 1.25" ext tube. No more 2" eyepieces for me! :D



#17 BinoGuy

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Posted 06 August 2014 - 06:01 PM

I don't see this posted earlier in the thread, but I sure learned something from this article

http://www.eyepieces...s-explained.htm  (click on Extended Information to read the article)

 

Cheers and clear skies,

~Matthew

 



#18 GeneT

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Posted 06 August 2014 - 06:12 PM

The Orion set looks like the best bang for the buck. Lumicon if you want the very best and are willing to pay 2x.

I agree with that statement. 



#19 David Knisely

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Posted 06 August 2014 - 06:51 PM

 

The Orion set looks like the best bang for the buck. Lumicon if you want the very best and are willing to pay 2x.

I agree with that statement. 

 

 

Actually, the DGM Optics NPB filter has performance that is a little better than the Orion Ultrablock for not a lot more money than the Ultrablock ($150 for the 2" NPB vs. $125 for the Orion 2" Ultrablock and $239 for the 2" Lumicon UHC).   In any case, you can buy on price alone here and still get a fairly usable filter.  Clear skies to you.


Edited by David Knisely, 06 August 2014 - 06:52 PM.







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