Should I give the 10" some love?

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Chopin
Post subject: Re: Should I give the 10" some love?
Posted: Wed Oct 02, 2013 7:12 pm
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I just had 90 superb minutes with the scope in somewhat unusual conditions. Not the best atmospherically, but ground air temp for this time of year is really warm, and there are virtually no more bugs out! Some minor quibbles, like the fact that I still don't have my "rotating" rings setup. And I noticed during collimation that the secondary is sagging (very slightly) when I tip the tube from vertical to horizontal. I don't believe it's the spider, but maybe the main screw/spring holding the secondary to the spider. I'll have to investigate tomorrow. A stiffer spring should fix the problem.

The good news is that this scope produces images that remind me of my 72ED. Stars give that pin pointy look, with no spikes. And the contrast is ridiculous! Two examples quickly, just because I need to hit the sack: M31 showed three dust lanes, 2 to the west and 1 to the east. I've never noted the third one "behind" the disk even in my 12" dob. Second was the Veil Nebula, which was an easy catch with filamentary structure in my Magnitude 6+ zenith. Oh yeah...I wasn't using a filter (since I don't currently have one)! I've never seen the Veil so well without filtration. Amazing. I'm going to bed now.

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Erik
Post subject: Re: Should I give the 10" some love?
Posted: Wed Oct 02, 2013 11:32 pm
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Awesome! Great to hear, Jason. I'm glad the scope is paying off. :cool:

Be careful though- once you get used to not seeing diffraction spikes, it's hard to view through a Newtonian with a straight spider!

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


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Chopin
Post subject: Re: Should I give the 10" some love?
Posted: Thu Oct 03, 2013 5:39 am
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No problem. All newts in my house will get curves now. :cheesygrin:

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Kawx4d
Post subject: Re: Should I give the 10" some love?
Posted: Thu Oct 03, 2013 7:18 am
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Excellent news Jason! Hopefully you can get the little secondary sag fixed, but other than that it sounds like a great scope!

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Mark
Post subject: Re: Should I give the 10" some love?
Posted: Thu Jan 16, 2014 8:29 pm
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Jason, JASON , J A S O N !!!!!!!!!!!!!!!!!! :dancing_snoopy:

Your new scope project looks awesome bro!!!! I am as stoked as you are !!!! :omg: :food-smiley-004: :chace_butterfly_on_Harley:

Looking forward to more on this thread. You're a pro at what you are doing. :BeavisButthead-01: :Dancing alien:

Cheerz !!!!

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Chopin
Post subject: Re: Should I give the 10" some love?
Posted: Fri Jan 17, 2014 8:34 am
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Thanks, Mark.

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Chopin
Post subject: Re: Should I give the 10" some love?
Posted: Tue Jul 22, 2014 4:57 am
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Hey all, just wanted to revisit this thread. It's been quiet for a while. After two nights with the scope I have completed an additional mod...a second set of holes for the primary cell just 40mm up. This allows the binoviewer to achieve focus without any correctors in place. Last night's experiment was pretty unreal. 1.2° of TFOV with two eyes in a 10" scope is something I've never experienced before. I was dumbfounded by how bright and resolvable M13 and M22 were, despite the dimming of the beam splitter and the 2/5 hazy transparency conditions. The only issue is that the 26mm plössls give too much exit pupil for the astigmatism in my right eye. I think it's time to finally hunker down and grab a pair of shorter fl wide fields to replace them.

And to revisit the sagging secondary issue, something that honestly baffled me for some time, it ended up not being the secondary at all. It was the laser collimator rocking loosely in the focuser ever so slightly that gave the impression of secondary mirror movement. It was like a "duh" moment. And now I only use the collimator in the Televue Equalizer adapter. It's the only adapter I own with über high machine tolerances and is strong enough to hold back a gorilla in heat. No more "sag". And my collimating has improved! Shocking. :cheesygrin:

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Erik
Post subject: Re: Should I give the 10" some love?
Posted: Thu Jul 24, 2014 10:36 am
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Glad to hear about the collimating issue- that's an easy solution.

Good idea with the additional holes for the cell as well. That's pretty cool- how long does it take to swap the cell out? Maybe you could install thumbscrews?

Sounds like a great observing session!

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


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Mark
Post subject: Re: Should I give the 10" some love?
Posted: Sun Oct 19, 2014 12:41 pm
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Sounds like big improvements Jason!!!! WOOHOO !!!!

Glad to see you took care of the issues and have now found better results!

Erik's idea of thumbscrews to move the primary up for the binos is awesome, (if you can pull it off).

Cheers!

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Chopin
Post subject: Re: Should I give the 10" some love?
Posted: Sun Oct 19, 2014 5:52 pm
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Thanks, Mark (and Erik, sorry I missed your post three month ago).

I've thought about a solution that could incorporate slots between the upper and lower respective holes so you could just slide the cell by loosening the screws. Thumb screws would be a perfect way to pull that off so I could switch on the fly! Great recommendation, Erik!

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Jason® (Admin...and spoke-folk)
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Single ride personal records: Distance-76.7miles, Max Speed-50.4mph, Max sustained speed (20miles) 19.5mph
“Life is like riding a bicycle. To keep your balance, you must keep moving.” ― Albert Einstein


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Erik
Post subject: Re: Should I give the 10" some love?
Posted: Tue Oct 21, 2014 12:27 pm
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Thanks Jason. Looking forward to seeing this project develop! :cool:

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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