red dot finder

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red dot finder

Postby alpet » Wed Dec 26, 2018 3:16 pm

My basic interest in Stargazing is , well, basic ! Using my trusty bins and a small reflector sometimes.

I also get a kick out of messing on with home made stuff such as small telescopes and " finders".

I am currently using a X1 Reflex finder , home constructed and based on the optical principal of the Telrad type of equipment . Not perfect but does work !.

I would like to build my version of the so called Red Dot Finder as frequently included with standard scopes and wondered if anyone could let me have some of idea as to what is involved in the workings.

I would be most interested to hear anything on this.

Many Thanks.

alpet.
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Re: red dot finder

Postby Graeme1858 » Wed Dec 26, 2018 7:52 pm

That would be an interesting project!

If you put Red Dot Sight into Wikipedia there's a page on the theory of how the red dot finder works.

Regards

Graeme
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Re: red dot finder

Postby alpet » Thu Dec 27, 2018 10:49 am

Hi Graeme, Thank you for reply and help......I never gave a thought to going into Wikipedia.

Mmmm ! Doesn't look a very bright prospect for a diy project but will think about it .


With regards

Alpet.
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Re: red dot finder

Postby The Man with the Corrugated Iron Roof » Sun Jan 06, 2019 10:47 pm

I had one and the battery ran out. I bought a 9x50 right angle finder and found it vastly superior. Red dots aren't a total waste of time but not the best option.
How can I be one with the universe when we don't know what 96% of it is.

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Re: red dot finder

Postby Gfamily2 » Mon Jan 07, 2019 1:29 am

The Man with the Corrugated Iron Roof wrote:I had one and the battery ran out. I bought a 9x50 right angle finder and found it vastly superior. Red dots aren't a total waste of time but not the best option.

I'll admit I replaced the RDF on my SCT with the same finder as you; but I've reused the RDF with my dSLR, and it works very well.
I centre the RDF (mounted on the hot-shoe) on a star, assuming it won't be right, give it 10s exposure; then re-centre the RDF.

Works well for me.

And, a propos the OP, RDFs are usually cheaply available via the Astro boots website

https://www.astroboot.co.uk/AstroBoot
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