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ASTROSCAN by Edmund Scientic Company

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#76 Gil V

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Posted 19 August 2014 - 04:29 PM

Why don't the links in the first post work ? I'm looking at my just received Astroscan, and I can't fix it without those links!!

#77 amicus sidera

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Posted 19 August 2014 - 04:53 PM

The switchover to the new forum software apparently destroyed the utility of those links (which in the future is going to be a rather large problem for anyone using the archives).

 

What info did you need? I might know it offhand.

 

 


Edited by amicus sidera, 19 August 2014 - 04:54 PM.


#78 Dave M

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Posted 21 August 2014 - 07:51 AM

All but the first link in that first post works for me, not sure why the first link on dating the astroscan

doesnt work though.. 



#79 PawPaw

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Posted 21 August 2014 - 08:10 AM

All but the first link in that first post works for me, not sure why the first link on dating the astroscan

doesnt work though.. 

The reason the link does not work is one to many "http's"  If you look at the properties of the link you will see 2 http's instead of one.  Do a copy and past with only one and you can get to the page.

 

http://http//www.clo...ev=#Post5951833

 

Either The original poster or a moderator could edit the link in the post.



#80 Chuck Hards

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Posted 21 August 2014 - 08:40 AM

I'm only seeing one "http" in that link, and it still doesn't work.



#81 PawPaw

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Posted 21 August 2014 - 08:55 AM

I'm only seeing one "http" in that link, and it still doesn't work.

For some reason I see two when I right click properties on the link.  If I cut and past the address with only one http I can get to the page.



#82 apfever

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Posted 21 August 2014 - 09:00 PM

There are two HTTP.  I simply put the cursor on the second one and deleted it from the address bar, then it worked.  I can no longer edit my post.



#83 Gil V

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Posted 23 August 2014 - 04:52 PM

The one I just got for $40 is SN 16251. Optical window is notched only partway through the glass. Chrome draw tube. Replaced primary foam yesterday. First light tonight.

#84 Chuck Hards

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Posted 23 August 2014 - 06:27 PM

I fixed the broken first link in the first post.  Don't know why I didn't see the second http the other day, but it's gone now and seems to work fine.



#85 apfever

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Posted 24 August 2014 - 12:09 PM

Here's the peep sight showing the bends. The sight holes and base all bend the same direction, the base bends at 45 degrees.

Attached Files



#86 apfever

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Posted 24 August 2014 - 12:10 PM

Chuck, if this is not enough then let me know.

Attached Files


Edited by apfever, 24 August 2014 - 03:27 PM.


#87 Gil V

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Posted 24 August 2014 - 01:42 PM

First light last night. The large exit pupil gives my astigmatic eyes a workout, but the scope performed well. No further collimation required.

Impossible to aim without a finder. About what I remember.

Saw M16, M8, M31 and satellite galaxies, and M27.

Happy with my work on the optics. Need to replace the felt pads on the base, though. Movement was a little too stiff on the worn felt.

Any suggestions?

#88 amicus sidera

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Posted 24 August 2014 - 01:50 PM

Need to replace the felt pads on the base, though. Movement was a little too stiff on the worn felt.

Any suggestions?

 

Yes; use felt.  :grin:

 

Seriously, craft stores sell sheets of self-adhesive felt in several colors, including red. A few minutes with a pair of scissors and you're in business.

 

Glad to hear everything went well with the mirror.



#89 Gil V

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Posted 24 August 2014 - 01:57 PM

Yeah, getting that primary retaining ring back in was hairy. I bought a clean pair of thick cotton gloves, and that kept the scratches down to a minimum.

#90 amicus sidera

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Posted 24 August 2014 - 02:13 PM

Took the Astro out for it's first run since I got it back together, last Friday. Working great! Cleaning did wonders, with the haze gone from the window I can resolve M13 and the Milky Way is way, way more intense than before. I didn't bollix the collimation, it still looks pretty good. 

 

 

 

Wonderful report! That haze was probably robbing quite a bit of contrast.

 

I must give both you and Gil a lot of credit for diving in and replacing the foam. The majority of Astroscans are now old enough that they almost certainly need this done; I hope that few are disposed of because the owners can't/won't or don't know how to repair them, or simply aren't aware that they can be fixed. Not sure if Scientifics is still offering to do this work any longer, but it's always good to know how to maintain one's own possessions.

 

Of course, anyone who's uncomfortable attempting this operation can still turn their scope upside down and stuff strips of foam into the 1/4" hole in the bottom; this method of repair can last a surprisingly long time, and there's absolutely no shame in taking this course, as mirror removal and replacement on these instruments is about the most difficult thing there is to perform in the entire Classic Telescope field, IMO.


Edited by amicus sidera, 24 August 2014 - 02:14 PM.


#91 amicus sidera

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Posted 24 August 2014 - 02:19 PM

Yeah, getting that primary retaining ring back in was hairy. I bought a clean pair of thick cotton gloves, and that kept the scratches down to a minimum.

 

Indeed, it's a nerve-wracking procedure. A few sleeks on the mirror are of no real consequence, and will have orders of magnitude less effect on the views than an f/4.2 system that's severely miscollimated due to deteriorated foam. 

 

Have fun with it!

 

P.S. If the scope is sticking a little, whatever you do, do not use wax or polish on the sphere; I made the mistake of doing that once, using clearcoat finish polish, and the poor scope wouldn't stay up at less than a 45 degree angle!  :foreheadslap:


Edited by amicus sidera, 24 August 2014 - 02:25 PM.


#92 Chuck Hards

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Posted 24 August 2014 - 02:43 PM

Chuck, if this is not enough then let me know.

 

Thanks, that's great actually!

 

I assume the two peep hole tabs are bent at 90-degrees?  It doesn't look like 90 in the photo but I assume that's camera distortion?



#93 amicus sidera

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Posted 24 August 2014 - 02:50 PM

Yup, they're at 90 degrees, Chuck.

 

Incidentally, the field of view through the peephole sight is 3 degrees, the same as the scope's f.o.v. when using the supplied 28mm eyepiece.


Edited by amicus sidera, 24 August 2014 - 02:52 PM.


#94 Gil V

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Posted 24 August 2014 - 02:55 PM

Standard sheet metal layout terms (from my nc program days) - Up 45, Up 90.

Which would fit perfectly on that excellent sketch.

I am so grateful to the community here. What a great bunch of people.

#95 Gil V

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Posted 24 August 2014 - 02:56 PM

******

 


Edited by Gil V, 24 August 2014 - 05:34 PM.


#96 apfever

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Posted 24 August 2014 - 03:29 PM

There is an error on your sketch. The sight holes are reversed. Small hole is by the wide end of the piece!!

 

 

Gil,  I fixed the picture.  Close enough but not as pretty a picture. For confusion sake, you and Fred delete your post and then I'll delete this one.



#97 Chuck Hards

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Posted 24 August 2014 - 03:31 PM

How does the bracket attach to the telescope? 



#98 apfever

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Posted 24 August 2014 - 03:41 PM

How does the bracket attach to the telescope? 

 

 

.

Attached Files



#99 Gil V

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Posted 24 August 2014 - 03:43 PM

Like my mom always told me, two heads are better than one.

#100 Chuck Hards

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Posted 24 August 2014 - 03:55 PM

Hey, what do you know?  A finder actually set-up for right-eye-dominant observers!




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