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The Barkonian!! 5 inch f-7 RFT

Started by Kevin Barker, 05/31/2012 12:32PM
Posted 05/31/2012 12:32PM Opening Post
A new telescope design!! A 5 inch RFT refractor.

Completely wooden (except for screws, optics, paint, glue, etc)

Works a treat and easy to collimate!!! the optics are very good on this old C5 lens. It is uncoated, air-spaced "super achromat"!!!!

Kevin Barker
Auckland, New Zealand

Attached Image:

Kevin Barker's attachment for post 55622
Posted 05/31/2012 12:40PM #1
Another view of the "Barkonian"
OTA is 18 cm X18 cm X73 cm. It has a mass of 4.5 kg approx.

50 mm eliptical Secondary is mounted on a 40 mm stalk of timber. Antares helical finder. lens is a 127/830

Works great I pushed it to 133 X last night on the moon and the images are very crisp.

Oddly CA seems quite low.

It is designed to be grab and go. The edge of the white Optical Box Assembly acts as a good finder.

Kevin barker

Attached Image:

Kevin Barker's attachment for post 144319
Posted 06/01/2012 06:36PM #2
Hi Kevin,
Great to see home made instruments! Looks like a lot of fun. Nicely done...

Posted 06/16/2012 12:24AM #3
A few finishing touches

Attached Image:

Kevin Barker's attachment for post 144494
Posted 06/18/2012 08:55AM | Edited 06/18/2012 09:42AM #4
OK. I'm not trying to cause any trouble but since no one else has asked: Are you claiming this is a "new" telescope design or a "new to you" telescope design?

Curious about your "C5 uncoated air spaced super achromat". Who made the lens and why do you call it a super achromat? What's so special about it?



40 year old restored C14 with recirculating cooling w/Skywatcher DOB GOTO Conversion (CPC14)

Synscan DOB mounted Sky-Watcher Evostar 150mm/1200mm ED Refractor

"Rescued" Craig's List Orion 120mm/1000mm Refractor