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Seen better days...

reflector
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#1 JEntwisle

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Posted 08 August 2020 - 05:43 AM

The primary and secondary from a 60 odd year old Newtonian reflector. The primary is around 3 and 3/4 inches. It looks to me like it has both tarnished and scratched somewhat. 

 

Still produces a pretty good image though.

 

 

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#2 John Miele

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Posted 09 August 2020 - 06:04 PM

I'll be danged...never seen a rectangular diagonal before!


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#3 ed_turco

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Posted 12 August 2020 - 12:09 PM

Worth a recoat.



#4 Darren Drake

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Posted 12 August 2020 - 12:14 PM

Edmund...



#5 JEntwisle

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Posted 18 August 2020 - 08:12 AM

I've recently learned a little more about the telescope.

It was purchased by my grandfather somewhere in the region of 50 years ago as a kit telescope for about 5 guineas.

The biggest issue with using it is the stand, which is dire. I'm considering knocking together a Dobsonian mount for it at some point.
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#6 sw196060

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Posted 18 August 2020 - 11:29 AM

My first homemade 6" f/8 used a rectangular secondary from Edmunds.

Home-ground primary mirror as well.   A lot of fun.


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#7 ed_turco

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Posted 18 August 2020 - 01:24 PM

Not Edmund.  There was something called "Skyscope' or some close name that sported a 3.5" mirror.  i suspect that you you own one.

 

There were any number of low tech telescopes in the 1950s and early 60s; they were longer focus and performed reasonably well.  I know; I had one.  Kept me busy for a couple of years until I took up the ATM hobby.

 

Well worth coating, rectangular secondary and all.


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#8 JEntwisle

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Posted 18 August 2020 - 04:59 PM

It looks to be about an f/7 I think, assuming I've measured the focal length right. Pictures below. You can see the highly sophisticated method of mounting the primary using a metal spring.

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#9 JEntwisle

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Posted 18 August 2020 - 05:15 PM

Not convinced by the eyepiece either to be honest.



#10 JEntwisle

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Posted 18 August 2020 - 05:22 PM

90% sure the eyepiece is from a microscope




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