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Equipment Discussions >> Classic Telescopes

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amicus sidera
Post Laureate
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Reged: 10/14/11

Loc: East of the Sun, West of the M...
Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5288725 - 06/25/12 04:30 PM

Quote:

Tim wrote:

(snip)There are a number of knobs in that picture. Some I made out of teak and threaded rod.(snip)




Are the main tube and mount of that Springfield also made out of teak, Tim?


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tim53
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Reged: 12/17/04

Loc: Highland Park, CA
Re: Restoring my 8" f/6 Springfield new [Re: amicus sidera]
      #5288734 - 06/25/12 04:36 PM

The tube is made out of Indian Rosewood plywood, which is basically a mahogany plywood with a 1/64" veneer of Rosewood on one side. I haven't seen this stuff available since I bout that sheet in about 1980. It's faded considerably, unfortunately.

The tripod is red oak, and the mount is aluminum 1/2" plate.

-Tim.


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tim53
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Reged: 12/17/04

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Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5291012 - 06/27/12 01:49 AM Attachment (21 downloads)

Okay, so a friend posted on facebook that the ISS was going overhead this evening, so my son and I went out and gandered it. Then I got inspired to get the Springfield out, collimate it, and see how it stacks up against the other two Optical Craftsmen mirrors I have.

2 nights ago, it was a shootout between the 8" Connoisseur and the 8" Discoverer OTA, so the seeing was similar for those two. Tonight, the seeing was a bit worse, a 3/10 instead of 4/10 for the other night. Still, I think the image is decent, if not as good as the view through the Connoisseur.

Connoisseur:


Discoverer:


Springfield (mirror from another Discoverer):

Edited by tim53 (06/27/12 01:52 AM)


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tim53
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Reged: 12/17/04

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Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5291016 - 06/27/12 01:55 AM

So, I'm figuring 2 outa 3 ain't bad...

...well, actually 2 out of 3 are actually pretty good, with the Connoisseur being a tad better than the Springfield, even though the seeing was a factor tonight, I bet the two in a shootout would still wind up with the Connoisseur on top.

The other mirror is a 2rd. It's just that simple. I'm going to put that OTA in the back of my shop, and next time I get a chance to attend the Delmarva mirror class, I'm going to bring it along and give it a new figure!

-Tim.


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Fred Ley
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Reged: 07/27/09

Loc: Lancaster,CA(Athens,GR)
Re: Restoring my 8" f/6 Springfield new [Re: amicus sidera]
      #5291132 - 06/27/12 06:03 AM Attachment (28 downloads)

Hello Tim,

Here is an image of your telescope from the 1984 RTMC. Taken with Kodachrome 64 slide film.

Fred


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Fred Ley
sage


Reged: 07/27/09

Loc: Lancaster,CA(Athens,GR)
Re: Restoring my 8" f/6 Springfield new [Re: Fred Ley]
      #5291138 - 06/27/12 06:21 AM Attachment (20 downloads)

Another view of your Springfield mounting. Taken at the 1992 RTMC, Kodachrome 64.

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Fred Ley
sage


Reged: 07/27/09

Loc: Lancaster,CA(Athens,GR)
Re: Restoring my 8" f/6 Springfield new [Re: Fred Ley]
      #5291140 - 06/27/12 06:28 AM Attachment (28 downloads)

I also have three additional Kodachrome 64 slides of your telescope from the 2001 RTMC.

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Fred Ley
sage


Reged: 07/27/09

Loc: Lancaster,CA(Athens,GR)
Re: Restoring my 8" f/6 Springfield new [Re: Fred Ley]
      #5291142 - 06/27/12 06:29 AM Attachment (21 downloads)

...here is No. 2 from 2001...

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Fred Ley
sage


Reged: 07/27/09

Loc: Lancaster,CA(Athens,GR)
Re: Restoring my 8" f/6 Springfield new [Re: Fred Ley]
      #5291145 - 06/27/12 06:30 AM Attachment (22 downloads)

...and the final slide from 2001 RTMC.

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tim53
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Reged: 12/17/04

Loc: Highland Park, CA
Re: Restoring my 8" f/6 Springfield new [Re: Fred Ley]
      #5291283 - 06/27/12 09:43 AM

Hi Fred:

Thanks for posting these! It's cool seeing early pics of the 8". The Rosewood has faded so much over time. I've been hoping to strip the varathane finish off and restain it (mixing my own stain to match a scrap of the original sheet that I still have that's been out of the sun all this time), but Terry says that Varathane needs to sanded off, it can't be stripped.

Thanks very much for posting the pics of my 12.5" f/23 Cassegrain when I had it mounted on the Springfield mount. For some reason, I don't have any pics of it in that configuration. I had it like that for about a year, IIRC, but I decided it needed a beefier mount, so I took it off the Springfield mount and turned it back into a Straight through Cass ( Cass thread ).

Now that I have the larger Springfield mount I bought off feebay a couple years back, I'd been cogitating about putting the Cass on that mount. But there's a problem with that idea that you can see from the photos you posted: The mirror is a thin one (1 1/8", IIRC), so the mirror end of the OTA was light enough that I needed to counterbalance the tube in dec by adding the weights behind the primary, which necessitated adding extra counterweights to the "beavertail". I think I had something like 85 pounds of weights combined. The mount held it, but it didn't like it much! The EM-500 I use for that scope nowadays doesn't break a sweat holding it off the ground!

That bigger Springfield mount could probably handle it fine as well (11" bearings as opposed to 6"), but it might also be comfy with a 14 or 16" on it. Hm... Old Springfield Mount thread

-Tim.


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tim53
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Reged: 12/17/04

Loc: Highland Park, CA
Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5291310 - 06/27/12 10:01 AM

I'd like to configure the counterweight for the larger Springfield mount similar to the one in this 1936 Stellafane photo (must be about a 12.5" Cassegrain), with the weight on the south side of the pier and out of the way of the observer. 1936 Stellafane photo of Cassegrain on Springfield mount . Mount detail . Looking at it in a bit more detail, that actually looks like it's based on the Pasadena mount, F.M. Hicks' modification of the Springfield - which must have predated the ATM II article by Porter where he redesigned the Springfield (in 1935), since Hicks passed away in 1930.

-Tim.

Edited by tim53 (06/27/12 10:10 AM)


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tim53
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Reged: 12/17/04

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Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5291314 - 06/27/12 10:04 AM

Fred:

I realized while looking at the pics of the Cass on the Springfield mount, that I must have "only" had about 60 pounds of counterweights on the mount. I've still got those weights, and use them occasionally to flatten warped furniture tops and such. For barbel weights, they're reasonably attractive, and may just turn up on one of my mounts again someday!

-Tim.


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tim53
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Reged: 12/17/04

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Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5292623 - 06/28/12 01:41 AM Attachment (21 downloads)

I figure I'm on a roll here!

So, tonight it was the Cave 8" f/7 Lightweight Deluxe. Same settings as with the other scopes, though I just used the shorty barlow this time, as it's got a nice sharp step where it goes into the focuser, and since the Cave has a Carle helical focuser it's easiest to focus by loosening the set screw and holding the camera while rotating the focuser. Easier and works better than it sounds, too.

Anyway, the seeing was better tonight than the previous few, which accounts for some of this, but I think I might have to rate this scope's optics a microtad better than the Connoisseur. What do you think?


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tim53
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Reged: 12/17/04

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Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5292629 - 06/28/12 01:44 AM

I've got two more 8" telescopes to compare! Tinky (tricolor Orange tube C-8 # 135) and the 1975 sand-cast forked C-8.

Then, I have my own 8" f/9 mirror that I started in 1973 and finished last year in Delaware, that I'm making a tube for (if I don't get frustrated and start over again for the second weekend!).

Which one of the C-8's should I try tomorrow night after work?

-Tim.


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iceblaze
Carpal Tunnel
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Reged: 10/15/11

Loc: 33.9° N, 118.4° W Lawndale, ...
Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5292690 - 06/28/12 03:07 AM

Absolutely killer pic of Saturn Tim!!

-James


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tecmage
Carpal Tunnel
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Reged: 01/13/10

Loc: Glenview, IL
Re: Restoring my 8" f/6 Springfield new [Re: iceblaze]
      #5292856 - 06/28/12 08:52 AM

Outstanding pic Tim.

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Fred Ley
sage


Reged: 07/27/09

Loc: Lancaster,CA(Athens,GR)
Re: Restoring my 8" f/6 Springfield new [Re: tecmage]
      #5293454 - 06/28/12 03:21 PM

Very nice image of Saturn. By any chance is that of its moons above the planet?

I believe that we have spoken, at least once, at RTMC. I have always enjoyed looking at your Springfield. One day I hope to be able to take a look through it.

Glad that you enjoyed the photographs.

Fred


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tim53
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Re: Restoring my 8" f/6 Springfield new [Re: Fred Ley]
      #5293523 - 06/28/12 04:12 PM

Hi Fred:

Yes! There were others as well, but they're all pretty deep in the noise on the 8-bit jpeg. I should look at the original 16-bit file and see if I can do a separate stretch on them and make a composite that shows all of them. Last night, I only had an hour before I had to pack everything up and stare at my eyelids overnight. Today, all kinds of exciting things to do at work - 38 days until landing!

-Tim.


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tim53
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Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5994695 - 07/28/13 12:48 PM

I decided to bump this thread up, since I think Lew's talked me into bringing the 8" up to CSPAMP VI next weekend!

So, I've got to put a guidescope and or finder back on the thing!

Maybe a 3" f/6 Jaegers with luan mahogany tube?



-Tim.


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Chuck Hards
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Reged: 05/03/10

Loc: The Great Basin
Re: Restoring my 8" f/6 Springfield new [Re: tim53]
      #5995094 - 07/28/13 04:36 PM

Quote:

I decided to bump this thread up, since I think Lew's talked me into bringing the 8" up to CSPAMP VI next weekend!

So, I've got to put a guidescope and or finder back on the thing!

Maybe a 3" f/6 Jaegers with luan mahogany tube?



-Tim.




That's nice! Right now I'm gearing up to do a 14" tube in teak, for a 12" mirror I picked-up earlier this year.

Is it veneer, or solid wood?


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