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Equipment Discussions >> Classic Telescopes

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tim53
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Reged: 12/17/04

Loc: Highland Park, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4650784 - 06/21/11 10:55 AM

Hi Jon:

It's really humid this week, so even though it's hot where I am (Highland Park, about 7 miles inland from downtown LA), it's probably hazy enough to attenuate the sunlight somewhat.

-Tim.


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Jon Marinello
Pooh-Bah
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Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4651424 - 06/21/11 04:49 PM

Test restarted at 1:48 PM PST.

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Jon Marinello
Pooh-Bah
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Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4651710 - 06/21/11 07:59 PM

Test ended at 4:58. 4 hours and 10 minutes. No crack. Tomorrow I will rerun the 60mm test with the filter in the ep which cracked last time.

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BigC
Carpal Tunnel
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Reged: 09/29/10

Loc: SE Indiana
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4651764 - 06/21/11 08:43 PM

Perhaps a photographer's light meter could measure the intensity of ambient sunlight.

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Jon Marinello
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Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: BigC]
      #4651939 - 06/21/11 11:05 PM

The measurement would be highly specific to the meter. It seems to me that it could a relative reading from day to day. But not any absolute measure. Right?

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BigC
Carpal Tunnel
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Reged: 09/29/10

Loc: SE Indiana
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4653076 - 06/22/11 03:38 PM

Interesting tidbit: just received an old Optica catalog and as of 1986 they discontinued their direct view solar filters and solar diagonals.They continued to offer the "projection system" accessory,the rod and screen, described as for safe solar viewing.Wonder if there was a lawsuit or a "near miss" .This catalog is the first I ever noticed the solar diagonal which diverted 95% of the Sun's light and heat.Looks like it might be a tie lighter!
And in place of my ebay Seymour Solar Filter I received a piece of costume jewelry: a lady's monocle!


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Jon Marinello
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Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4661653 - 06/27/11 03:30 PM

I just re-started test (2, 60mm) at 12:20 PM PST. I will leave it pointed at the sun for a maximum of 2 hours. Will report back later today on the result.

This is the second of these tests to see if I can repeat the crack.

Finally getting some clear calm skies here. Tonight should be a great night for Saturn.


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Preston Smith
The Travel Scope Guy
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Reged: 04/24/05

Loc: Eureka, Pa
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4661754 - 06/27/11 04:38 PM

Quote:

...Tonight should be a great night for Saturn.




Geez Jon, do you really think you'll be able to see it through a sun filter?



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Jon Marinello
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Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Preston Smith]
      #4661773 - 06/27/11 04:54 PM

Preston, I guess you just aren't familiar with how clear the skies can get here. I am often forced to use a solar filter to view even DSO's.

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Jon Marinello
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Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4661777 - 06/27/11 04:57 PM

Still no cracks but damn that filter is HOT!

Definitely much hotter than when mounted in the star diagonal nose. As expected.


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Preston Smith
The Travel Scope Guy
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Reged: 04/24/05

Loc: Eureka, Pa
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4661815 - 06/27/11 05:32 PM

Quote:

Preston, I guess you just aren't familiar with how clear the skies can get here. I am often forced to use a solar filter to view even DSO's.






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Jon Marinello
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Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4661989 - 06/27/11 07:52 PM

Ended the test at 4:45PM PST. That's a total time of 4:25. The filter did not crack.

This differs from the previous run of this test. The skies were very clear today and it was warm here. I was expecting a cracked filter this time. Ok so we have two different results for this test.


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Awesomelenny
Post Laureate
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Reged: 05/02/04

Loc: Long: 81.42 W Lat: 41.21 N
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4662216 - 06/27/11 10:36 PM Attachment (51 downloads)

Hi everyone!

I had a Unitron or it was sold to me as a Unitron Herscel Wedge. Jon has it now. Jon, try this test with this Herschel wedge and the solar filters you got. Give us a report on it.

By the way gang, the wedge doesn't close all the way. I thought this was normal. Is it?


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Preston Smith
The Travel Scope Guy
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Reged: 04/24/05

Loc: Eureka, Pa
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Awesomelenny]
      #4662302 - 06/27/11 11:20 PM

Quote:

Hi everyone!

I had a Unitron or it was sold to me as a Unitron Herscel Wedge. Jon has it now. Jon, try this test with this Herschel wedge and the solar filters you got. Give us a report on it.

By the way gang, the wedge doesn't close all the way. I thought this was normal. Is it?




Lenny,

I believe I have an earlier version as my screws are common - not phillips. My lid does close all the way and I have a small retaining clip that holds the prism in place. THe retaining clip has two screws in it. I'll try and take a picture later.


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Al8236
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Reged: 08/18/10

Loc: 48.9173N 122.1390W
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Awesomelenny]
      #4662326 - 06/27/11 11:39 PM

Len,
Is it just me or is the prisim turned end for end?
I seem to remember the thicker end being at the bottom.
Al


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Joe Cepleur
Carpal Tunnel


Reged: 03/18/10

Loc: Dark North Woods
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Al8236]
      #4662689 - 06/28/11 08:50 AM

Quote:

Len,
Is it just me or is the prisim turned end for end?
I seem to remember the thicker end being at the bottom.
Al




If the prism can fit either way but must fit in one correct orientation to work properly, this would be another example of bad engineering. For sake of safety, the housing should be designed not to allow any but the correct fit.


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Al8236
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Reged: 08/18/10

Loc: 48.9173N 122.1390W
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Joe Cepleur]
      #4662747 - 06/28/11 09:41 AM

Joe,
That's kind of what I'm thinking, if the prisim were reversed the cover should close properly from looking at the pictures. (at least that is the way it looks to me)
Al


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Jon Marinello
Pooh-Bah
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Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Al8236]
      #4663460 - 06/28/11 04:21 PM Attachment (50 downloads)

I flipped the prism around and it closes much better but not completely. The image is correct now so it was definitely in backwards before.

So, I setup my Meade AR6 last night and had about the best view of Saturn I have ever had. The seeing was really good for here. I was hoping to get a good view of Jupiter in the early AM. Two things stopped that; first, the clouds rolled in. second I had a very severe sciatica attack. I have never had one of these before but I can tell you the pain is excruciating. No matter if you stand, sit or lie down. It was a long night and at about 3:00 I took some aspirin and got some sleep.

Its a little better today and I wanted to continue running the tests.

Since my hind end and and left leg are in pain and out of commission I decided on this. I left the AR6 on the EQ-G and installed the Herschel wedge attaching the solar filter to the eyepiece. A 6" objective should really heat things up don't you think? Reminds me of Myth Busters.

The test started about 10 minutes ago at 1:07PM.


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Jon Marinello
Pooh-Bah
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Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? new [Re: Jon Marinello]
      #4663465 - 06/28/11 04:23 PM Attachment (51 downloads)

Here is a shot of the Herschel Wedge in action. I can tell you the heat coming out the back of that wedge is intense! It could definitely fry your neck tie!

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Jon Marinello
Pooh-Bah
*****

Reged: 09/21/10

Loc: Santa Barbara, CA
Re: Use of vintage eyepiece sun filters... Why not? [Re: Jon Marinello]
      #4663468 - 06/28/11 04:24 PM Attachment (54 downloads)

After about 10 or 12 minutes I pulled the eyepiece and felt the filter temperature. It is MUCH less hot than in the other tests. So it appears that so far at least the wedge is dissipating most of the heat.

Edited by Jon Marinello (06/28/11 05:02 PM)


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