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Thread: A Belated Report from 08/30/17 and 09/01/17

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    Default Re: A Belated Report from 08/30/17 and 09/01/17



    Thanks n_F_A

    I do have to remind myself to keep trying these things! Thank for re-enforcing that notion!

    So the real reason I suspect I got better views recently without the LP filter is that the moon glow off of the particulates in the atmosphere really makes the view very difficult (if not next to impossible) and this cannot ever be remedied by a narrow-band LP filter.

    I believe I'll see better results on a moonless night where I will see the benefit of the LP filter clearly.

    I will keep trying the narrowband filter I have.

    I don have a broadband LP filter. I wonder if you have any thoughts regarding that? I purchased the narrowband on the advice of Orion Customer Service, and a little bit of educated guessing on my part. So I do wonder, if I would benefit from a broadband LP filter as well? It would be nice to be making comparisons with them to see for myself.

    Naturally I'd like the oxygen III filter, just working on building my collection of accessories slowly as cash accumulates.

    Clear Skies!
    Last edited by DeeFitz; 09-10-2017 at 09:21 PM. Reason: clarity
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    Default Re: A Belated Report from 08/30/17 and 09/01/17

    Hmm...

    I'm wondering which LP filter you have? A well made filter (and that usually means not so inexpensive) should help. To cut costs some filter makers cheap out and don't do a good job with polish and flatness of the filter glass. This is a much more likely cause for "filter regret" than atmospheric particulates. It could be that you are seeing scattered light from the filter itself.

    I've kind of settled on going to Baader for my filters except for a few esoteric custom items. There are a few filter makers out there that are good apart from Baader.

    My favorites are the OIII and the Hbeta.
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    Default Re: A Belated Report from 08/30/17 and 09/01/17

    I'm using the Orion UltraBlock NarrowBand Filter.

    They do use Baader solar filter film for their solar filters.

    I don't know whether or not the Ultrablock Narrowband LP filter is comparable quality but it was $79.95 so not exactly the low end of things. But I have nothing to compare it with either. Perhaps it is of low quality.
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    Default Re: A Belated Report from 08/30/17 and 09/01/17

    Where in the optical path do you place your filter? I've been placing mine on the eyepiece but I've read it's possibly better to put it on the diagonal?

    My general thinking on LP filters is that some DSO's will benefit and some DSO's will not. Therefore the right strategy seems to be to keep trying the filter with everything until I'm very familiar with the way it works and on what it performs best upon.

    Here are the light pass comparisons I've been able to find on LP filters:

    They didn't compare Orion Ultrablock narrowband filter to the equivalent Baader filter but it does appear that the Orion Ultrablock narrowband filter performs slightly better than the competition at least in the spectrum profiles here.

    Attachment 163896

    I've also included the broadband comparisons since they do compare the Baader filter with the Orion filter here.

    Attachment 163897

    Of course these graphs don't represent the quality of the grinding and the glass and the coatings, just the light pass characteristics, so your point regarding Baader is certainly correct. Everything I read is that Baader does set the industry standard at this point on filters period. I'm buying the Baader solar filter film to make an off axis solar filter for my telescope and I'm convinced after much wrangling with the subject that it is the best choice.

    But from what I can see, the Orion Ultrblock narrowband isn't the worst choice either, assuming they don't use inferior methods and lower quality glass, and I'm still convinced after re-reading everything I can find on filters that the narrowband is still the better strategy choice for what I'm trying to do, (Which is view as many DSO's as I can from Fort Collins in my fairly light polluted backyard) and for the particular LP profile in Fort Collins. Although perhaps my understanding is not perfect here and I'm still missing something essential.

    I also found this article:

    Light Pollution Filters for the (Much Too) Enlightened Masses | The Astronomy Nexus

    Which again, re-enforces my notion that I did choose well enough. Although I would absolutely love to compare the Orion Ultrablock narrrowband to the Baader equivalent. I'm relatively sure that I could discern an improvement in the Baader if one existed. Which seems likely given what I've read.

    My best view is towards the east by southest to southwest (My building is four stories high and blocks the northwest to the northeast from my view) but being on the south end of Fort Collins, puts me closer to Loveland and Loveland airport off to the east. Pretty much making things difficult for at least half the view in that direction. So, I'm probably in the worst situation I can be in here in Fort Collins, for skyglow. Only Denver could be worse.

    I just get as far away from the ground lights as possible, I'm using a pvc pipe DIY "light break" or "Telescope Blind" to make it easier on the eyes viewing through the eyepiece, as well as wearing an eye patch to avoid the extra incoming light while viewing and to protect my stargazing eye when not it's not in use.

    A real pain, looking like an amateur astronomer / pirate techno geek with a red headlamp and an eyepatch. But it does help a bit.

    So I'm fighting losing my dark adaptation (from forgetting ten things and going back inside for them), and the skyglow and trying to see faint DSO's... But I manage, it seems, to surprise myself by being patient, and determined, I find things I thought I'd have to be in a very dark site to see.

    Taking the time to understand and properly use LP filters seems like a pretty important step to take on this journey.

    Thank you so much for weighing in on this!

    btw, on your advice, I'll be saving up for the Baader O III filter as it seems like the next best choice for my skies.
    Last edited by DeeFitz; 09-11-2017 at 02:54 PM. Reason: clarification
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