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Equipment Discussions >> Equipment

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Shawn H
Post Laureate


Reged: 05/16/07
Posts: 3008
Loc: Southern France 43°56'N-4°50'E
Re: Got my Scope, First Light Report new [Re: Krish Mandal]
      #3425328 - 11/02/09 11:24 AM

Krish
Good looking scope! But the guy standing next to it The Telrad is good kit! Look into it! With its 2° & 4° bullseye rings it sure makes starhopping easier under clear sky's! But if you have a lot of light pollution GO TO is the only remedy or else your stuck observing planets & stars!

--------------------
18" David Lukehurst truss Dobson with Sky Commander flash 4 DSC's & Moonlite CR2 focuser & Astrocrumb filter slide
Orion xt10i fully flocked with Telrad on 4" risers & Feather Touch focuser & huge Boston Red Sox decal
The original Orion StarBlast & 15x70 Celestron Skymaster binos & Ethos & Naglers & Dobs oh my!
Orion Ultrablock narrowband filter & Astronomik OIII line filter
Tele Vue 2x Barlow & Antares 1.6x (2") Barlow
CATSEYE collimation tools, TeleGizmos Dob covers


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Krish Mandal
member


Reged: 09/02/09
Posts: 40
Loc: Forest Hills, NY
Re: Got my Scope, First Light Report new [Re: bbcoltrane]
      #3425835 - 11/02/09 04:33 PM

Brian, thanks, good advice about the use EPs. I was actually thinking about getting a nice 80mm scope as my piggyback finder, which I could use as a travel scope later. I agree that the 50mm isn't good for much at all in suburban skies, esp. in Queens, NY.

--------------------
Krish Mandal

EQUIPMENT LIST:
15x70 Celestron Skymaster
Meade LXD75 8-in SCT ACF

Professional photographer and astronomy neophyte

My astronomy journal at http://nightskylog.blogspot.com


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hfjacinto
Almost got me
*****

Reged: 01/12/09
Posts: 2096
Loc: Union,NJ
Re: Got my Scope, First Light Report new [Re: bbcoltrane]
      #3425852 - 11/02/09 04:42 PM

Krish,

I had a telrad and didn't find it useful in NJ/NY skies. I go along with the RACI finder.

The thing you will need is dew control. Especially now, I checked NOAA and the next couple of clear nights humidity at 12AM will be in the 70% and shoot up to 90% by 2-3AM. Without some type of dew control, you will maybe out for an hour or 2. A 2" diaganol is also good. I am not a Plossl fan,(FOV is more limited than I like) you have try the Hyperions. Next Friday is supposed to be clear, I might take my scope to Sperry, if you want to meet a couple of us there, just let me know and feel free to try out the Hyperions.

--------------------
C9.25 ASGT 9*50 MM Finder,FT Focuser & 2" Diagonal
Meade LXD 75 6 Inch SNT w 9*50 MM Finder
5,6,9,14.5 MM Zhummel Planetary EPs
13,17,21,24,31,36 MM Baader Hyperion
6.7,8.8 MM Meade UWA & 11 MM Nagler T6
Planetary, OIII and Narrowband Filters
Thousand Oaks Dew Control w Kendrick Heaters


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hfjacinto
Almost got me
*****

Reged: 01/12/09
Posts: 2096
Loc: Union,NJ
Re: Got my Scope, First Light Report new [Re: hfjacinto]
      #3425856 - 11/02/09 04:45 PM Attachment (11 downloads)

Krish, btw I have the same mount but different scope (looking at the pictures, you can tell who is the professional photographer

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C9.25 ASGT 9*50 MM Finder,FT Focuser & 2" Diagonal
Meade LXD 75 6 Inch SNT w 9*50 MM Finder
5,6,9,14.5 MM Zhummel Planetary EPs
13,17,21,24,31,36 MM Baader Hyperion
6.7,8.8 MM Meade UWA & 11 MM Nagler T6
Planetary, OIII and Narrowband Filters
Thousand Oaks Dew Control w Kendrick Heaters

Edited by hfjacinto (11/02/09 04:46 PM)


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hfjacinto
Almost got me
*****

Reged: 01/12/09
Posts: 2096
Loc: Union,NJ
Re: Got my Scope, First Light Report new [Re: hfjacinto]
      #3425862 - 11/02/09 04:47 PM

See how I artfully placed the chandelier to give an effect like I can't take pictures And the plates on the wall being cut off.

--------------------
C9.25 ASGT 9*50 MM Finder,FT Focuser & 2" Diagonal
Meade LXD 75 6 Inch SNT w 9*50 MM Finder
5,6,9,14.5 MM Zhummel Planetary EPs
13,17,21,24,31,36 MM Baader Hyperion
6.7,8.8 MM Meade UWA & 11 MM Nagler T6
Planetary, OIII and Narrowband Filters
Thousand Oaks Dew Control w Kendrick Heaters


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gnowellsct
professor emeritus


Reged: 06/24/09
Posts: 733
Re: Got my Scope, First Light Report [Re: Krish Mandal]
      #3426571 - 11/02/09 11:50 PM

Krish your view of Jupiter may have been soft because of the collimation issue. You may profit from this:

http://www.astromart.com/articles/article.asp?article_id=718

incidentally if the scope is tracking well you can use any bright star but one neat trick is to collimate on one of Jupiter's moons. Make sure the moon you choose, not Jupiter, is in the CENTER of the field. Scope position affects the mirror tilt which affects the collimation process very slightly. Since your most "sensitive" objects for details are Mars/Jupiter/Saturn, it makes sense to collimate as close to them as possible.

Image softness is (a) seeing and (b) collimation much more often than it is (c) the eyepiece, unless you're using muddy glass from the muddy glass factory.

The Pleiades will always look "empty" in a large aperture scope. But you've gained access to thousands of dimmer open clusters that are even more beautiful. Try NGC 7789 in Cassiopeia.

I take it that the RACI is important because you are not using go-to due to the paddle problem with Meade. Once you have go-to you will find that you'll just let the go-to system handle the zenith positioning. But you'll find that the RACI is impossible to use as you tilt lower to the horizon.

I've used an SCT for ten years on a GEM and I use a straight through finder. I think it's the best choice. The mirror reversal is a problem but you get used to it. In any case once you're dialed in with go-to or digital setting circles it becomes a moot point. You can also use manual setting circles to navigate at the zenith. Or give things an extra hour to pass overhead a bit, which is what most Dob owners do (they call straight up "the dob hole").


good luck,

Greg N

--------------------
"Aperture will get you through times of no money better than money will get you through times of no aperture."

featuring selected astrojunk:

bunch o' widefield eyepieces
bunch o' narrowfield eyepieces
couple o' Barlows
couple o' scopes
couple o' mounts
couple o' tripods
and a pier 'n' stuff


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Krish Mandal
member


Reged: 09/02/09
Posts: 40
Loc: Forest Hills, NY
Re: Got my Scope, First Light Report new [Re: gnowellsct]
      #3430735 - 11/05/09 10:13 AM

Hi everyone, thanks for the input. I forget who said it, but yes, I'm having to use the scope manually because of the lack of a hand controller for the meantime. But I don't mind really, I like the idea of having to get to know the skies manually, though I think the learning may be enhanced if I can get the scope to point and learn with it, kinda like cheating on tests...as you write something down on your hand to cheat with, you've actually absorbed it and find that you've studied! LOL. OK, bad example. Still, the straight through finder is hard on my neck.

@Shawn: yeah, not the best pic of anything there. It's done off my 5MP phone-cam propped up on my mac laptop from work. So yeah, I didn't do the scope or myself justice. My camera is sitting right here on my desk, I just got super lazy.

@HFJacinto: You took a great pic of your stuff, better than mine. You must actually be the pro photog, cuz I think I dropped photography to play with my scope the last few weeks! Anyway, you're absolutely right, I think the first thing I have to look into now that the nights are getting colder is that dew prevention system. I had to fan the front of my corrector plate and the eyepiece several times to get rid of the dew two nights ago. Eventually I got so tired of it, I gave up and dragged all the stuff inside and went to bed (I was tired anyway). I've been looking for dew controllers online and they're not really cheap either, what with the controller and the bands. I've said it before, astronomy's like starting all over in photography again, you gotta buy all the things that make the experience and productivity better, after you've spent some hard cash on the main instrument. Oh well.

You and I will have to get together sometime when we both can afford to be out later at night with no school the next day, and that invitation for next Friday sounds like the right time. I'll give you a shout on the phone soon. I'm looking forward to seeing the difference between the Plossl and the Hyperions and meeting you and your compadres.

@Greg: I think you're right about the collimation. I may do that very soonm, like this Saturday. I'm also thinking of replacing the collimation hex-screws with the thumb screws from Scope Stuff, since I may be collimating on a regular basis. At this point, that's the cheapest thing to try to get for my scope (haha). But seriously, the collimation may be off, since I continuously drag the whole kit and kaboodle in and out to the backyard each time I want to observe. Boy am I glad I didn't get anything larger.

I'm thinking that the RACI/Telrad problem is better solved by using a short FL refractor, maybe even an APO which is sort of affordable, after I get some money in my pockets again. That would kill two birds with one stone, I'll have a grab and go for when I want to just do some quick sessions. But I might get a Telrad, just to play with, since they're not too expensive, used.

So my needs are now prioritized as follows:
1) Replacement collimation screws
2) Dew prevention setup (I think at least 4 inputs needed)
3) 2" diagonal / Crayford focuser replacement
4) Short tube refractor for dual use as finder
5) Other EPs as warrant

Thanks guys.

--------------------
Krish Mandal

EQUIPMENT LIST:
15x70 Celestron Skymaster
Meade LXD75 8-in SCT ACF

Professional photographer and astronomy neophyte

My astronomy journal at http://nightskylog.blogspot.com


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