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What did you do to your Scope/Mount Today?

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#6276 icomet

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Posted 15 September 2021 - 01:33 PM

I needed a counter weight for a rebuild. The dob base was built for f/6 and I'm stuffing an f/7.5 into it. So I robbed one off of one of the Caves to get it working. Primary mirror and mirror cell is out of an Optical Craftsman, I believe. Touched it up first.

 

Clear Skies.

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#6277 icomet

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Posted 15 September 2021 - 03:57 PM

Stuffing completed.

 

Clear Skies.

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  • 10 inch f_7.5 star splitter.jpg

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#6278 ccwemyss

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Posted 15 September 2021 - 04:15 PM

I got the legs for the Edmund 4" refractor mount sanded and stained. Hope to get a coat of urethane on them tomorrow. Sunday night is forecast to be mostly clear, so I'd like to be able to take it to school for an observing evening. 

 

Chip W. 


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#6279 tim53

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Posted 15 September 2021 - 05:53 PM

Maybe your Ford gassed up here. (I took this photo)

 

Clear Skies.

Closer to the same vintage...

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#6280 Terra Nova

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Posted 16 September 2021 - 10:22 AM

Maybe your Ford gassed up here. (I took this photo)

 

Clear Skies.

‘You can trust your car to the man that wears the star, the big red Texaco star!’ band2.sml.gif


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#6281 clamchip

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Posted 17 September 2021 - 01:24 PM

I spent most of the morning digging this orange 8 out of hobbyland.*

The reason why is I'm beginning to wonder if special coatings and/or Starbright, Starbright XLT

darken the view. 

These coatings are mostly on the corrector but I think the Starbright series are also enhanced

coatings on the mirrors too.

This actually all started with my ex Unitron 150 with the green multi-coated objective. My Edmund

4 was way brighter with it's single layer coating. Since then I've been skeptical about these multi

coatings.

I accept multi coatings as being superior for eyepieces, binoculars, and telescopes used during

the daytime. I'm not so sure about astronomical observation.

I'll see for myself. M57 the ring nebula is my test. I'll compare plain Jane uncoated orange 8 with

orange 8 'special coatings', and black tube 8 Starbright coating.

Robert

 

*Hobbyland is the second floor of our house. I have the north half my wife has the south. The

dormer area in the middle is neutral territory. I make sawdust in the north and it smells like rotting

pulp magazines so my wife stays in the south.

 

This C8 is not my first but it is the first one I finally truly learned just how good a SCT can be.

With the help of my senior optician friend Pierre he hammered into me the importance of precision.  

Before this I didn't understand, and it didn't make sense to me why everything needed to be so

perfect, and if it wasn't perfect you were going to be unhappy and look at other designs, which is

what I did.

With this C8 for some reason I gave it everything I had to make sure everything was perfect

and it paid off royally. I've been a CAT fan ever since.

 

post-50896-14074130237827_thumb.jpg

post-50896-0-84050300-1581804948.jpg


Edited by clamchip, 17 September 2021 - 01:33 PM.

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#6282 tim53

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Posted 17 September 2021 - 05:40 PM

I make sawdust in the north and it smells like rotting

pulp magazines so my wife stays in the south.

You should make things out of Zebrawood.  She'll appreciate the rotting magazine smell, if you do!


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#6283 clamchip

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Posted 17 September 2021 - 06:06 PM

The rotting magazine smell is my model airplane magazines and

Mechanix Illustrated magazines.

I keep a close eye on them, and give them plenty of air circulation

and watch the moisture level in my room.

She just has a super sensitive nose. 

 

Robert



#6284 ccwemyss

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Posted 17 September 2021 - 07:53 PM

I got a coat of urethane on the legs for the Edmund 4" mount yesterday, then put it together tonight. I'll try to get a picture of the whole thing outside, tomorrow. It's going in for an observing evening on Sunday. 

 

Edmund 4 - 1 (4).jpeg

 

I also made a carry handle for the Meade 152. Just cut a couple of brackets for the top of the Parallax rings, and mounted a 1" dowel between them, painted black. I don't think I will be taking it in for this session. I haven't been able to brace the new pedestal yet, and the old one is too tall for some of my students to reach the eyepiece. I came very close to giving up on the new one and buying a Berlebach Planet that was for sale on AM, just a few miles from here. But when I contacted the seller with a couple of questions, he replied that after getting it out to check it, he decided it was just too beautiful to sell, and took down the ad.

 

I think I have a solution for the bracing, and have some material on order. Because it's the same diameter as the Edmund 4" OTA, I can repurpose the brackets I made for that, when I had it on the other mount, to be the upper mounts for the braces. The bottom ends will have a bolt that runs through the last hole in the RV6 leg, and clamps them tightly to it.

 

Chip W. 


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#6285 Garyth64

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Posted 17 September 2021 - 08:20 PM

I was envisioning some tripod legs something like those.  And now seeing them, they look great!



#6286 clamchip

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Posted 19 September 2021 - 01:58 PM

My uncoated C8 is ready.

It's on a Losmandy 8 tripod so I can have adjustable legs and observe seated.

Jupiter and Saturn will be observed straight through, and I need to use a star to

make sure the mirror separation is ok observing straight though. If not I can add

extensions.

Celestron says mirror separation is correct when the factory prism diagonal and

25mm eyepiece are used. If you defocus a star both side of focus should look the

same. If not you will have spherical aberration spoiling the view. Its easy enough

to satisfy this requirement defocusing a star, and once you are satisfied try not to

make gross changes with the focus knob.

I only have a small window for Jupiter and Saturn, the orange line is it.

My project is to see how uncoated plain Jane does on planetary detail with Jupiter

and Saturn, and then I'll swing up near zenith and checkout M57 brightness and

color, all comparing to coated C8's with 'Special Coatings' and the newer Starbright

coatings.

Robert

 

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Edited by clamchip, 19 September 2021 - 02:01 PM.

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