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  #341  
Old 16-06-2018, 03:21 PM
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sopticals (Stephen)
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Quote:
Originally Posted by pixelsaurus View Post
Cheers. Sorry for the delay. Will it also remove any overcoating as well?
Yes.

Stephen
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  #342  
Old 16-02-2019, 06:55 PM
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sopticals (Stephen)
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Any body out there?

Hi guys, you got any new mirror grinds on "the make"?

I've been so enjoying the full 2 degree wide views of Milky Way with my 10" Zhumell (one of my two "grab and go" scopes) using a Nagler 31T5 that for a "more intense" experience at the 1200-1250mm focal length I have decided to grind out a 12 1/2" blank I have sitting spare, to approx f4. Exit pupil at the 40.3x is close to 8mm, but my dark adapted pupil opens pretty wide at 7mm plus so won't lose much light.

Have played with 6"f8, 8"f6, 10"f5 (all around 1200-1250mm fl) so why not try 12.5" f4 for the same size FOV?

Anyway started the project today. See picture.
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  #343  
Old 19-02-2019, 09:11 AM
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pixelsaurus (Mike)
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No grinding at the moment. A friend has given me a complete 225mm diameter Dall Kirkham mirror set ,which need to be coated, plus a transfer lens. I need to find a tube or summit. This after flocking my 12" newt and building an EQ platform.
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  #344  
Old 20-02-2019, 09:26 AM
Stefan Buda
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Another one alive in Melbourne:
A couple of 250mm, f2.7 CDK primaries in the making.
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  #345  
Old 09-04-2019, 10:57 AM
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Lognic04 (Logan)
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Bump! Is anyone still out there making mirrors? I'm working on a 10 inch f3 then next a 16 f3
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  #346  
Old 09-04-2019, 05:33 PM
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DaveGee (Dave Gault)
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I finished a 10"F3.something a few years ago but never tubed it. However I've started on a scope to house it. No secondary, video camera at prime focus.

Here are some photos. The filenames say 10f3 but I don't remember the context of what I was doing at the time (~2006)

I observe occultations and this is primarily to observe asteroid occultations, pre-point and drift while I sleep.
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  #347  
Old 09-04-2019, 05:46 PM
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Lognic04 (Logan)
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Hi Dave, good to see someone working on a mirror! Just a fair warning, your mirror shows quite bad Stig (see the tilt of the Ronchi bands changes.

But, I'm excited to see the finished scope!
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  #348  
Old 03-07-2019, 01:07 PM
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sopticals (Stephen)
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Progress on second 33" mirror.

Just finished a 12 1/2" f4.14 mirror (well ready for final star testing). The second of my 33"ers, this one a f3.95 is going through corrective figuring to
correct a "rolled edge" defect. Did manage to get the inside 30" to an acceptable level of performance, but need to do better.All my work is done by hand, no machinery of any kind, (except did do the edge bevel with a belt sander).
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  #349  
Old 12-08-2019, 12:21 PM
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sopticals (Stephen)
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Dob structure for star testing.

Recently threw together a cheapy Dob assembly to star test mirrors from 6"f8, 8"f6, 10"f5, 12 1/2" f4 (currently "housed") to 14 1/2" f3.6.

Construction cost was minimal as only used "stuff" I had lying around from
previous projects. Didn't have enough of same type of wheels for cart, so use a pair from a discarded child's toy for rear. Will get a matching
pair in due course.

Stephen.
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  #350  
Old 13-08-2019, 01:55 AM
cpoc
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Does anyone know if there are any groups still doing mirror making/grinding in the Ballarat area? I think the local observatory used to but I don't think they do now?

I'd love to give it a go but would rather do so under supervision.


Thanks for any help.
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  #351  
Old 15-08-2019, 06:12 PM
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sopticals (Stephen)
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Seemingly "no response" to your request. Maybe they have "all died".

Mainly just a few of us "old timers" left out there. Gone are the days when one "had" to fabricate ones own optics. All to easy now to buy affordable Chinese scopes.

Stephen.
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  #352  
Old 16-08-2019, 04:45 AM
Rod
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Hi

I was active in Ballarat way back in the 90s when a few of us were making mirrors. I've lost touch since moving from there so not sure what's happening there now.

I notice you are in Melbourne. There is an active group of mirror makers now within the ASV who are part of the Instrument Making section.

Stefan and Logan are two whose posts you may have seen.

Regards

Rod
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