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Question About Unitron 60mm Finderscopes

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19 replies to this topic

#1 Tom Duncan

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Posted 14 November 2020 - 11:01 AM

Are both of the finderscopes on this Unitron 60mm OTA actually authentic Unitron pieces? 

 

Thanks

 

Tom Duncan 

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#2 CharlieB

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Posted 14 November 2020 - 11:40 AM

To me, the larger one looks like an Edmund finder.  The smaller is a Unitron.

 

Charlie


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#3 CHASLX200

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Posted 14 November 2020 - 11:41 AM

To me, the larger one looks like an Edmund finder.  The smaller is a Unitron.

 

Charlie

You beat me to it.



#4 BrooksObs

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Posted 14 November 2020 - 12:49 PM

The small silver finder is definitely the one that came with the 60mm (I had one), the black and white one and its brackets are of some non-Unitron origin, but I have no idea which it might be.

 

BrooksObs



#5 starman876

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Posted 14 November 2020 - 01:44 PM

The finder brackets are not Unitron either. Someone added that finder later.  Unitron did make a set of Uniclamps so you could mount the Unitron finder from the 75mm  on the  60mm.



#6 Kasmos

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Posted 14 November 2020 - 02:22 PM

Another vote for the added one being the type used by Edmund.

 

Gary posted this one:

https://www.cloudyni...ries/?p=7643346



#7 Tom Duncan

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Posted 14 November 2020 - 03:05 PM

OK folks, thanks. I am trying to determine if my kit is complete enough to sell whole but it's turning out it's missing too many pieces (and has the extra non-Unitron finderscope) so I'll be parting it out. 

 

Tom



#8 CharlieB

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Posted 14 November 2020 - 10:31 PM

The finder brackets are not Unitron either. Someone added that finder later.  Unitron did make a set of Uniclamps so you could mount the Unitron finder from the 75mm  on the  60mm.

Yes, the brackets are also from an Edmund.  



#9 CHASLX200

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Posted 15 November 2020 - 06:57 AM

Yes, the brackets are also from an Edmund.  

Then they had to drill holes in the tube. But it looks fine to me as is.



#10 combatdad

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Posted 15 November 2020 - 07:12 AM

Some additional info on Unitron viewfinders: https://www.unitronh...-2/viewfinders/.

 

Dave


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#11 Tom Duncan

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Posted 15 November 2020 - 08:28 AM

Some additional info on Unitron viewfinders: https://www.unitronh...-2/viewfinders/.

 

Dave

Thanks for the link, very helpful.

 

Tom 



#12 starman876

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Posted 15 November 2020 - 11:02 AM

A shame they added that finder.  Wonder what the distance between the mounting holes are?  Maybe some real Unitron finder brackets from a 75 mm can be installed and a 75mm finder can be hooked up.  Would at least give the scope some appeal.  



#13 Terra Nova

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Posted 15 November 2020 - 11:21 AM

As far as I recollect, the standard 5x19 chrome plated finder on my late-1960s Italic lettered model 114 had a single-crosshairs (simple cross) reticle eyepiece. However, the 5x16mm finder on my much earlier mid-‘50s 62mm 114 has the double crosshairs. Any idea on when this change came about?



#14 starman876

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Posted 15 November 2020 - 11:49 AM

As far as I recollect, the standard 5x19 chrome plated finder on my late-1960s Italic lettered model 114 had a single-crosshairs (simple cross) reticle eyepiece. However, the 5x16mm finder on my much earlier mid-‘50s 62mm 114 has the double crosshairs. Any idea on when this change came about?

the double cross hair eyepiece was really etched glass to creat the double cross hair look.  Was a great feature. 



#15 Kasmos

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Posted 15 November 2020 - 04:08 PM

I'm fairly sure my circa '57-'58 114 with double crosshairs has wire..... but I'll double check.

Unitron-114-Finder-R.jpg

 

Unitron-114-Finder-Frt.jpg

It only has a singlet lens for the objective, did they ever come that way?

 

It also has a clam chip at the top undecided.gif

 

 

 



#16 Terra Nova

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Posted 15 November 2020 - 05:12 PM

It only has a singlet lens for the objective, did they ever come that way?

Chris, my older one has a singlet lens.


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#17 starman876

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Posted 15 November 2020 - 11:09 PM

I never checked for that.  Always assumed they were doublets.



#18 Kasmos

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Posted 16 November 2020 - 04:04 AM

It only has a singlet lens for the objective, did they ever come that way?

Chris, my older one has a singlet lens.

waytogo.gif Terra, I thought I'd remembered reading that in your thread on your 114. 

 

As for the crosshairs and the EP it looks like it may very well be an etched reticle but I can't access it to 100% confirm.

Unitron-Finder-EP1.jpg

Both the field lens (above) and eye lens (below) have retaining rings without any small spanner notches to unthread them.

I've never run into a situation quite like this. They appear to be threaded but how were they installed?

Unitron-Finder-EP.jpg

 

Unitron-Finder-Crosshairs.jpg

If it's etched it's on the other side of the glass which is up against a stop that's been swabbed with flat black paint. 

The shinny areas are where they missed the edge of the stop.

I had to press a small piece of damp lens tissue with a small dowel to clean it the best I could.

There are small bubbles in it or between it and another piece of glass or inner lens.

 

Have any of you run into the same situation regarding the retaining rings?


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#19 starman876

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Posted 16 November 2020 - 07:30 AM

I knew about the etched glass because I have cleaned a lot of these eyepieces.   Finders seem to get abused a lot.  


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#20 Tom Duncan

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Posted 16 November 2020 - 12:43 PM

waytogo.gif Terra, I thought I'd remembered reading that in your thread on your 114. 

 

As for the crosshairs and the EP it looks like it may very well be an etched reticle but I can't access it to 100% confirm.

attachicon.gifUnitron-Finder-EP1.jpg

Both the field lens (above) and eye lens (below) have retaining rings without any small spanner notches to unthread them.

I've never run into a situation quite like this. They appear to be threaded but how were they installed?

attachicon.gifUnitron-Finder-EP.jpg

 

attachicon.gifUnitron-Finder-Crosshairs.jpg

If it's etched it's on the other side of the glass which is up against a stop that's been swabbed with flat black paint. 

The shinny areas are where they missed the edge of the stop.

I had to press a small piece of damp lens tissue with a small dowel to clean it the best I could.

There are small bubbles in it or between it and another piece of glass or inner lens.

 

Have any of you run into the same situation regarding the retaining rings?

Regarding the retaining ring with no slots for a spanner, use common rubber stoppers, usually available at larger hardware stores. Pick a size that just squeezes into the barrel so it will grasp the ring and not the glass. If the glass is proud (sticking up above the level of the ring) grind out the center of the stopper so that it becomes concave to clear the glass. 

 

Tom Duncan


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