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Unitron / Brandon 4" guide scope?

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#1 sgorton99

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Posted 05 January 2013 - 06:02 PM

Just purchased this second 4" Unitron focuser and Brandon 4" lens as a project/backup for my 155. Is this focuser from a 4" Unitron that was made as a guidescope for an even bigger Unitron? Should receive by the end of next week :)...

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#2 sgorton99

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Posted 05 January 2013 - 06:04 PM

Brandon lens.

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#3 starman876

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Posted 05 January 2013 - 07:37 PM

Looks like a regular 4" focuser. What diameter is the OTA. If it is the same diameter as the Unitron 4" OTA I have the back that will aloow you to screw the focuser into without needing those screws to hold it in.

#4 sgorton99

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Posted 05 January 2013 - 07:41 PM

I am not getting the OTA, but actually have a spare "naked" Unitron 4" OTA with dew shield. I'll send you a PM Johann when I get it and let you know, thanks!

#5 sgorton99

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Posted 11 January 2013 - 06:26 PM

Arrived today, a deluxe focuser for a 3" Unitron with (what appears to be Unitron) step-ups for a 4" Unitron OTA. This focuser is much smaller than the one on my 155, and a little bigger (and much better) than the one on my 140. Oh, and the Brandon lens looks great!

#6 starman876

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Posted 11 January 2013 - 07:36 PM

Those 75mm deluxe focusers only came on the 145C. I think they also could be ordered as an option. Nice catch.

#7 sgorton99

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Posted 11 January 2013 - 09:24 PM

On the 75mm scope -

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#8 sgorton99

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Posted 11 January 2013 - 09:24 PM

Close up

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#9 starman876

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Posted 11 January 2013 - 09:27 PM

Those are sweet and hard to find. Sort of like a mini 4" focuser.

#10 starman876

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Posted 11 January 2013 - 09:28 PM

They were the early version of what we now call no mar focusers with the clamping ring.

#11 gelkin

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Posted 11 January 2013 - 09:53 PM

I've always wondered if this deluxe focuser was an option on my 3" from about 1960. It has no engraving with dia and focal length like Steves.

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#12 sgorton99

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Posted 11 January 2013 - 10:07 PM

I've always wondered if this deluxe focuser was an option on my 3" from about 1960. It has no engraving with dia and focal length like Steves.


Nice - I think they left off the mm and focal length so they could interchange these on a variety of scope packages.

#13 xavier

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Posted 12 January 2013 - 03:15 AM

Nice - I think they left off the mm and focal length so they could interchange these on a variety of scope packages.


You're right. On my website you find photos of my 75mm altaz with a super focuser with no size indication. I don't know if the focuser was added after the purchase of was original.

The Super focuser is longer than the "normal" focuser. You can only use the scope with the Super Unihex. Can't reach focus with other combinations. Not really a problem ;-)

I think there aren't two identical Unitron/Polarex telescopes.

#14 sgorton99

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Posted 12 January 2013 - 08:31 AM

OK, got the Brandon lens out for some pics this morning.

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#15 sgorton99

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Posted 12 January 2013 - 08:32 AM

More

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#16 sgorton99

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Posted 12 January 2013 - 08:32 AM

Again

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#17 sgorton99

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Posted 12 January 2013 - 08:33 AM

More again

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#18 mustgobigger

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Posted 12 January 2013 - 08:35 AM

your going to like that brandon lens.

#19 sgorton99

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Posted 12 January 2013 - 08:35 AM

This has a very interesting adapter/holder to fit the lens on the Unitron 4" OTA. The lens/cell assembly screws in to the OTA coupling.

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#20 sgorton99

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Posted 12 January 2013 - 08:47 AM

Thanks Brian. I ended up with three 4" lenses w/cells - two Unitrons and 1 Brandon. One of the Unitrons is due to arrive Monday after being sent to D&G Optical for cleaning and new spacers (was missing 2). I also have an "extra" Unitron 4" OTA, so with this focuser package and lens will be able to set that up.

I really like this deluxe 3" focuser compared to my standard one on my 140. I already swapped it out, as my 140 is my current grab-n-go scope and gets the most use.

#21 starman876

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Posted 12 January 2013 - 10:35 AM

You have become a very good hunter of Unitron gear :bow: :bow: :bow: :bow:

#22 terraclarke

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Posted 12 January 2013 - 11:45 AM

My 1967 Unitron catalog list the "Deluxe Rack and Pinion Focuser" as being available as an option on the 75 mm Models 140, 142, and 145 for an additional $15.50 as well as on the #150 (4 inch alt-azimuth).

#23 bobbyt63

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Posted 12 January 2013 - 10:16 PM

i am getting a 4" brandon lens #10079 with a unitron OTA it is in shipping, have you had a chance to compare the brandon lens with a unitron .also maybe you know how this marrage between uni and brandon came to be.could i assume mine is 79 and yours is 95 and how many do you think where made . thanks bob

#24 gelkin

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Posted 12 January 2013 - 10:49 PM

My 1967 Unitron catalog list the "Deluxe Rack and Pinion Focuser" as being available as an option on the 75 mm Models 140, 142, and 145 for an additional $15.50 as well as on the #150 (4 inch alt-azimuth).

Hey Terra
I've never seen a 1967 Unitron catalog. Is it different than any shown here?

#25 sgorton99

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Posted 13 January 2013 - 08:15 AM

The deluxe focuser seemed a little too stiff, so took apart last night and regreased. This golden colored grease you see is actually more like wet sticky glue than grease. Took entire focuser apart and soaked in warm soapy water to clean off. Then thoroughly dried and regreased with lithium grease. Much smoother now, and the top tension screw allows you to easily control the focus resistance. This is a great upgrade from the standard focuser!

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