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Unitron 131-C

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#251 Dave M

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Posted 08 April 2013 - 01:13 PM

Dan, the dimensions of my solar plates are
5 7/8" Wide x 7 1/2" High, That`s for the metal plates only, doesn`t include the little bracket that slides onto the rod.

#252 starman876

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Posted 08 April 2013 - 01:34 PM

same size as the ones I have

#253 DanWray

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Posted 09 April 2013 - 12:25 AM

Thanks guys. Now the question is, is that size unique to the 131-C.

#254 Dave M

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Posted 09 April 2013 - 06:31 AM

That I don't know, but Johann or someone else might be able to answer that question..

#255 starman876

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Posted 09 April 2013 - 09:08 AM

I think they are the same size as they 4" ones. Because of the way they mount on the 131C and the 131C being a larger diameter OTA. I will measure when I have a chance.

#256 akman1955

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Posted 10 April 2013 - 06:54 AM

:)wrong Johann.. the 4 inch unitron sun screens are fatter and do not fit and the 75mm unitron sun screens are to small in length. the compact sunscreens are totally different diminsions and only fit the compacts. Set a 4',3' and compact sunscreen side by side and you will see..

#257 starman876

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Posted 10 April 2013 - 07:04 AM

Ooops. I will have to do that. Thanks for the heads up Clint :waytogo: :waytogo:

#258 Dave M

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Posted 10 April 2013 - 09:25 AM

So bottom line, all plates are different and specific to the model telescope they came with ?

#259 starman876

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Posted 10 April 2013 - 03:08 PM

well, to those that know the difference :lol: :lol:

#260 terraclarke

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Posted 10 April 2013 - 09:58 PM

Not different for each model but for each OTA diameter because since its a straight thru and not a right angle projection system and thus requires a perforated shade screen, the distance from the center of the rod to the center of the drawtube varies with the diameter of the OTA making it necessary to have a variety of sizes.

#261 Dave M

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Posted 11 April 2013 - 08:59 AM

That's what I figured, but wasn't sure if the rod brackets were different lengths.. Thanks!
Hopefully this all helped answer Dan`s ?

#262 Dave M

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Posted 11 April 2013 - 01:13 PM

The Unitron cap for my 131-C had a crack in the side, I fixed it with some epoxy, but since I had 3 solar aperture reduction caps I used one to make another dust cap. Just used a 1 1/4" chrome hole cap and it works great.
I could have Unitron engraved into the hole cap. :)

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#263 starman876

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Posted 11 April 2013 - 02:54 PM

Awesome :bow: :bow:

#264 Dave M

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Posted 11 April 2013 - 04:25 PM

Thanks Johann, simple but effective :)

#265 starman876

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Posted 11 April 2013 - 04:45 PM

I love simple but effective

#266 Dave M

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Posted 19 June 2013 - 10:37 AM

Believe it or not :grin: i finally set up the 131 last night
and got a first light through her, makes you wonder when she last collected a few photons, the previous owner just used it as a display piece in his living room. Anyway it was on the brief side but i viewed the moon and Saturn. It definitely is sharp and has that snap to focus sweet spot.
I used the Unihex with its arsenal of eyepieces, the 40mm i
got from Johann gave a really nice, but i was really impressed when i tossed in a old vintage 28mm University Optics flat top Ortho, Wow! thats one sweet vintage eyepiece, if you ever run across one "Buy!it". I also tossed in a 20mm Masuyama and 16.8mm Meade RG eyepiece, the 20mm tossed up an incredibly sharp view, fantastic eyepiece.
Saturn was a beautiful gold color, and i could see either
a background star or possibly Titan ? it was a tiny tiny pin point of light at the 3 o`clock position relative to saturn.
Eventually i`ll do a lot more viewing through the 131 but it appears to be a real sweet and fun scope.

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#267 starman876

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Posted 19 June 2013 - 11:17 AM

Glad you finally got to look throught the scope. They are sweet scopes. I have been tempted to order better flats for mine just to see if it actually would improve the views. I have never seen anything published on what the optical quality of the flats is. Anyone know?

#268 Chassetter

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Posted 19 June 2013 - 12:46 PM

Hi Dave, try this Java script Moons of Saturn app for the date and UT when you were observing to confirm Titan.

http://www.skyandtel...pt/saturn_moons

Nice scope btw, mustgobigger has one in the classifieds now.

#269 Dave M

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Posted 19 June 2013 - 05:24 PM

Thanks! And Thanks for that link, that would confirm it was Titan, puts it in the right place at the right time. :cool:

#270 akman1955

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Posted 06 July 2013 - 11:59 AM

:)I've :grin: been telling everyone for years these are nice scopes:) glad you are now a believer.. he he

#271 Dave M

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Posted 06 July 2013 - 03:33 PM

I believe :) :ubetcha: it wont be going anywhere, anytime soon.

#272 twhite

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Posted 09 November 2014 - 08:08 PM

Anyone else have a 131C with a serial number on the lens cell?

 

Know I'm late to this party, but my 131C has a coated (green) lens with a serial number... mine is C-557.



#273 choran

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Posted 09 November 2014 - 08:43 PM

I have a regular Unitron 3" scope with lens cell marked C-602.



#274 starman876

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Posted 09 November 2014 - 09:03 PM

I have a green lens on a 142.  



#275 twhite

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Posted 09 November 2014 - 10:55 PM

I have a green lens on a 142.  

 

Interesting.  I've also got a green-lens 4" OTA.








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