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Old 10-14-2010, 10:17 PM   #3106
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Gulf Island Building.


My photos of the observatory are really terrible.

Here's a link to the club http://www.nanaimoastronomy.com/

I couldn't find any pics of the obs on the website, but they must be there somewhere.

If these pics come out in order...they show the support for where the roof rolls off to, the entrance, the 12" concrete pier which the scope sits on - the pier or scope must not touch any part of the building as it will cause movement, therefore it is isolated, and the last one you can just see part of the rollers under the eave there.

We have a motorized roll off roof.
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Gulf Island Building.-obs-1.jpg   Gulf Island Building.-obs-2.jpg   Gulf Island Building.-obs-3.jpg   Gulf Island Building.-obs-4.jpg  

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Old 10-14-2010, 10:31 PM   #3107
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Gulf Island Building.


That's amazing! Thanks for taking the time to find the pics and posting them.

Since the roof rolls off, was it hard to weatherproof the area where the roof meets the walls that surround the telescope ( when the roof is not open)? I hope that makes sense.
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Old 10-14-2010, 10:31 PM   #3108
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Gulf Island Building.


Coco's astronomy tip of the day (No. 10)

Something about focuser's...not the most exciting of subjects, yet you will see that like almost anything else astronomical, the prices vary wildly.

The purpose of a focuser is to hold an eyepiece in place and then be able to bring your image into perfect focus. A simple enough request, right? This isn't a trick question...it is simple enough.

However, the finer and more accurately you want your scope to focus, the better quality focuser you will want.

A low cost focuser will do a creditable job, and until you have a little experience, you may not even realize that you are unable to bring your object to perfect focus, as it will likely look "OK".

This first example is an inexpensive unit as might be found in the lowest cost scopes.
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Old 10-14-2010, 10:33 PM   #3109
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Gulf Island Building.


This one is a bit more heavy duty, more metal in the construction and a little larger.
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Old 10-14-2010, 10:35 PM   #3110
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Originally Posted by gma2rjc View Post
That's amazing! Thanks for taking the time to find the pics and posting them.

Since the roof rolls off, was it hard to weatherproof the area where the roof meets the walls that surround the telescope ( when the roof is not open)? I hope that makes sense.
No, it wasn't a problem.

I wish I had some better photos to show you, but where the roll off roof sits when it is closed, the roof goes under the roof where the computer room is.

Plus we made up some special flashing so that any driven rain would be directed away from the join. It works fine.
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Old 10-14-2010, 10:39 PM   #3111
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The preceding focusers have all been for refractors (you know what kind that is!) and now here are two to demonstrate the different mounting methods for a refractor and a reflector.

Notice the curved side on the reflector focuser...that attaches directly to the side of the tube. You can get different radii to fit different tube sizes.
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Old 10-14-2010, 10:41 PM   #3112
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These will show you how much travel a typical focuser has. Because you may be using eyepieces with widely varying focal lengths, it is necessary to have a fair bit of travel in the focuser.
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Old 10-14-2010, 10:42 PM   #3113
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This focuser is adaptable for either a 1 1/4" eyepiece or 2" eyepieces.
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Old 10-14-2010, 10:44 PM   #3114
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There is a cast in dovetail on this focuser to accommodate a finder.
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Old 10-14-2010, 10:48 PM   #3115
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Just one last focuser to show you for the evening, this one is a Moonlite, on a Celestron C6Rscope. More on the scope itself tomorrow.

Showing the focuser open and closed.

This is a two speed focuser with a 10x speed reduction allowing extremely precise focusing. It will make a very large dent in a $500 bill. But it's beautiful, and buttery smooooooooth.
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Old 10-14-2010, 10:58 PM   #3116
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Gulf Island Building.


Do all of your scopes, lenses, eyepieces, etc. have their own hard plastic case to store them in?
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Old 10-14-2010, 11:06 PM   #3117
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Gulf Island Building.


Keith that is really neat, that has to be so much fun to be able to bring outer space in that close to see. There sure is a bunch of great reading on the link you gave us, I appreciate that, I will be doing a lot of reading there. There are some of the most fantastic photos I have seen. Thanks for sharing buddy.
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Old 10-14-2010, 11:24 PM   #3118
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Good gravy, that is a lot of pieces, that would take a while to know how to use all of them. Keith I really do appreciate you going to all the trouble to photograph and post all of this information. I have this in my file now, there is a bunch of reading to do.
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Old 10-14-2010, 11:59 PM   #3119
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Quote:
Originally Posted by gma2rjc View Post
Do all of your scopes, lenses, eyepieces, etc. have their own hard plastic case to store them in?
The scopes don't but the accessories usually do. Some of the smaller more expensive scopes have hard cases.

So eyepieces usually come either in a plastic case, or cardboard box.

Those plastic cases screw together and they are very strong. Some of the better quality eyepieces come in boxes with fitted foam around the eyepiece.
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Old 10-15-2010, 12:37 AM   #3120
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Gulf Island Building.


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Originally Posted by jiju1943 View Post
Good gravy, that is a lot of pieces, that would take a while to know how to use all of them. Keith I really do appreciate you going to all the trouble to photograph and post all of this information. I have this in my file now, there is a bunch of reading to do.
Jim, most of those focusers will (eventually) be going in to scopes that I will build and give away. I think I have enough stuff to make about 10 scopes, which will all be refractors.

Several years ago I was at a star party down near Victoria and I had my long tube scope set up for solar observing. There was a young lad there with his mum, and I got the impression that there wasn't any chance that they could afford to buy him a scope.

What upset me the most was that I didn't have anything there with me that I could give him - which I really would liked to have done. So I resolved on the spot that I would make up several refractors and next time I went to a star party I would have something to give away.

What impressed me the most about this fine young lad was his extreme politeness. He would look through the scope while it was tracking the sun, very quietly ask me a question, thank me politely and then his mum would call him away. I think she got the impression that he had got more than his share of time looking at the sun...when in fact the very opposite was true. So they would go away, then an hour or so later would come back and he would just stand there and see if I would invite him to have another look - which of course I did right away.

I finally was able to convince mum that her son could watch all day if he wanted because that's what I was there for...to share with the youngsters.

Of course many of the youngsters were 40 - 50 - 60...

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