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Introductions / Re: A quick intro
« Last post by ChrisR on Jan 25, 2022, 13:58:15 »
Hello Chris, I'm also a visual observer and it seems like you might have several interests similar to mine: Arduino electronics, mechanical and electronic DIY, a little bit of IT. I worked for couple of years for the Polish Metoffice as my first job after graduation and brushed against metrology too (in meteorological and hydrological applications).

Mechanical projects so far are

Done - Make a set of tripod leg extensions out of 42mm SS exhaust tubing, it slides nicely over 1.5" tube with a little adhesive felt to take out the slack.

In progress -  Plan to try using a screw in reticule holder to mount a small area of filter to see if it can be used to occult the bright primary of a double star to help see the fainter companion/s. Specifically thinking of Rigel and Sirius here. I'm exchanging emails with another astronomer who is trying out gluing a flat wire at the focal plane of a spare eyepiece as an alternate method.

In progress - There is close to an 800g difference between some of my eyepiece weights and with my Allview mount this caused an issue because I'm right at the limit of the mount capacity anyway. As it happens I aquired an AZ-EQ5 at the weekend so it may not matter, however I am planning to add a rail and adjustable weight mount to see if I can use that to maintain a better balance. I have noticed that a heavy 2" eyepiece in a diagonal already puts the COG noticeably off the dec and tube axis as well.

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Introductions / Re: A quick intro
« Last post by RafalK on Jan 25, 2022, 13:08:49 »
Hello Chris, I'm also a visual observer and it seems like you might have several interests similar to mine: Arduino electronics, mechanical and electronic DIY, a little bit of IT. I worked for couple of years for the Polish Metoffice as my first job after graduation and brushed against metrology too (in meteorological and hydrological applications).
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Telescopes Etcetera.... / Re: Annoying refraction spikes.
« Last post by Carole on Jan 24, 2022, 23:29:28 »
I guess you could try putting a blocking Ring in front of the aperture, that makes the aperture smaller and hides the bolts. 
Not sure I am explaining this well.  But simply as an experiement to temporarily block out the bolts, and see whether it improves the star spikes, then at least that might prove or disprove them as being the problem.

Caroie
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Telescopes Etcetera.... / Re: Annoying refraction spikes.
« Last post by JohnH on Jan 24, 2022, 14:15:32 »
I have a feeling this is going to be a long slog!

In the meantime I have come across a review in Sky and Telescope which, whilst generally favourable, does mention a profusion of diffraction spikes. The review also suggests that I was tweaking the back focus from the reducer in the wrong direction.

Fingers crossed,

John

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Introductions / Re: A quick intro
« Last post by doug on Jan 24, 2022, 10:05:15 »
     Nice to meet up with you, Chris. Hope you had a good evening.

     Doug.
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Introductions / Re: A quick intro
« Last post by Carole on Jan 24, 2022, 10:04:34 »
Welcome Chris, sounds like you have a good background to make the most of Astronomy. 

Quote
let's say the changes since the early 80's have been significant.
I'll bet.

Hope to see you at an OAS meeting once we get back to Face to Face ones.

Carole

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Introductions / Re: A quick intro
« Last post by Apophis on Jan 24, 2022, 07:44:40 »
Welcome to the Society Chris ,
Roger
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Introductions / A quick intro
« Last post by ChrisR on Jan 23, 2022, 19:46:47 »
I enjoyed meeting a few members at Otford last week and look forward to getting to know more of you.

I decided to stop waiting for a good time to get back into astronomy last October, though you might say when is it not a good time? After a little research I bought a used Skymax 127 and Allview mount and was up and running in November. I quickly re-discovered what it was I always enjoyed about astronomy and over the last few months have added somewhat to my equipment. There has also been a quite a lot of time spent watching youtube videos too, let's say the changes since the early 80's have been significant.

I am planning to stick with visual observation for now, though EAA interests me and I expect I'll try that out eventually. I currently work in IT, my background includes IR optics and metrology so I have a strong interest in the technical and scientific aspects of astronomy, but not to the detriment of enjoying the skies I hope.
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Telescopes Etcetera.... / Re: Annoying refraction spikes.
« Last post by The Thing on Jan 22, 2022, 09:29:40 »
Hi John,

Small screws e.g. the finder bracket, focuser mount, ring at front of scope do cause diffraction elements. There is a tool for modelling and correcting the effects in StarTools. Also something I have come across since getting a 3d printer is people printing a mask to go round the primary mirror to cover the retaining clips - presumably to stop effects from them. You should make sure all the shiny screws are blackened, is you use a 'feathery'  paint such as Black 3.0 it will also soften the diffraction effect. Fuzzy flocking would also work but would protrude into the optical path more than paint and might cause secondary (heh heh ;) ) effects. In my SCT OTA the seam in the flocking where the join overlaps I put in it causes a spike...

Good luck solving it!

Duncan

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Astrophotography / Re: The Moon
« Last post by The Thing on Jan 22, 2022, 09:20:04 »
I've responded to my public and de-cheesed the Moon :)

Lovely image Duncan.

With that colour I’m not sure I’d take a bite if it was cheese - it would probably be even more smelly than Pont l’Eveque !

Robert

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