I finished a project!

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I finished a project!

This topic has 23 replies, 18 voices, and was last updated 25 October 2018 at 19:05 by Neil Wyatt.

Viewing 24 posts - 1 through 24 (of 24 total)

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7 September 2018 at 19:50 #370849
Neil Wyatt
Moderator
@neilwyatt
Telescope built around a Skywatcher 66 ED lens cell.

Neil
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7 September 2018 at 19:50 #31226
Neil Wyatt
Moderator
@neilwyatt
7 September 2018 at 20:15 #370858
Brian H
Participant
@brianh50089
Very Impressive Neil.

Brian
7 September 2018 at 20:39 #370864
Brian Sweeting 2
Participant
@briansweeting2
Excellent work Neil.
7 September 2018 at 20:56 #370865
Harry Wilkes
Participant
@harrywilkes58467
Looking good
7 September 2018 at 21:45 #370872
Emgee
Participant
@emgee
Impressed with your work Neil, nice job.

Emgee
7 September 2018 at 22:16 #370876
John Penfold
Participant
@johnpenfold74932
I am sure that felt good. Well done.

J
7 September 2018 at 22:28 #370877
Mick B1
Participant
@mickb1
Excellent work – will we be seeing the output on the Astro images?
7 September 2018 at 23:07 #370883
charadam
Participant
@charadam
Very nice job Neil.

Serious question, if I may.

Does all the bright white lettering in front of the lens make a measurable difference to image contrast/quality?
7 September 2018 at 23:22 #370885
David Taylor
Participant
@davidtaylor63402
Impressive!
8 September 2018 at 00:17 #370891
Ed Duffner
Participant
@edduffner79357
Nice work Neil,

Is, or are the lens' APO as the ring suggests?

Ed.
8 September 2018 at 08:39 #370913
Neil Wyatt
Moderator
@neilwyatt
Posted by charadam on 07/09/2018 23:07:24:

Very nice job Neil.

Serious question, if I may.

Does all the bright white lettering in front of the lens make a measurable difference to image contrast/quality?

I'm sure some contrast-obsessives go over them in black sharpie. I would guess they are low down enough for virtually all the light to be reflected off the front of the lens and any left would hit the internal baffle.

More noticeable are the letters reflecting in the dew shield. This means a coat of heatproof black paint is needed over the anodising.

Neil
8 September 2018 at 08:45 #370914
Neil Wyatt
Moderator
@neilwyatt
Posted by Ed Duffner on 08/09/2018 00:17:43:

Nice work Neil,

Is, or are the lens' APO as the ring suggests?

Ed.

Not strictly, it's an ED doublet and no doublet can be truly apochromatic, but its performance is closer to a true Apo than an ordinary achromat – Skywatcher are bit cheeky, most scope builders call them 'semi achromatic'.

Neil
8 September 2018 at 08:50 #370915
Neil Wyatt
Moderator
@neilwyatt
Posted by Mick B1 on 07/09/2018 22:28:15:

Excellent work – will we be seeing the output on the Astro images?

That's the plan all along!

I have a telephoto lens the same focal length that frames things well, but has too much chromatic aberration. This scope should be great for larger objects

Neil
8 September 2018 at 18:53 #370968
mechman48
Participant
@mechman48
That looks a real pro job Neil, give that boy a gold star for the week…

George.
25 October 2018 at 10:39 #377565
Paul Ainsworth
Participant
@paulainsworth93685
Looks great, I tried Astro photography with a telescope once, not very successfully. Ended up just shooting Lunar pics with a 300mm f4 and 1.4 tc as it was a lot easier.
25 October 2018 at 11:36 #377573
Nick Hughes
Participant
@nickhughes97026
25 October 2018 at 12:35 #377589
roy entwistle
Participant
@royentwistle24699
What's the last post doing on here ?
25 October 2018 at 12:43 #377591
Adrian 2
Participant
@adrian2
Beautifully made Neil. I feel humble.

Adrian.
25 October 2018 at 13:16 #377601
Ian S C
Participant
@iansc
Nice one Neil, in the spirit of ME of old, although those guys ground there own mirrors.

Ian S C
25 October 2018 at 14:55 #377607
Ady1
Participant
@ady1
Looks great!
25 October 2018 at 17:26 #377626
Neil Wyatt
Moderator
@neilwyatt
Thanks folks.

Afraid I am, probably NOT the sort of person who could competently grind a mirror, Ian. I recently refurbed a 10" dobsonian though and I've just come into the mirror set for a 6" scope.

Neil
25 October 2018 at 17:38 #377630
David George 1
Participant
@davidgeorge1
A nice professionall job. How do you drive the axis motors?

David
25 October 2018 at 19:05 #377646
Neil Wyatt
Moderator
@neilwyatt
Posted by David George 1 on 25/10/2018 17:38:13:

A nice professionall job. How do you drive the axis motors?

David

That mount has steppers built in (HEQ5). There is a handset, but i sue it under computer control 9 times out of 10.

I retro fitted home made steppers and gearboxes to my smaller NEQ3-2.

Neil
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