Jump to content

 

1825338873_SNRPN2021banner.jpg.68bf12c7791f26559c66cf7bce79fe3d.jpg

 

Crazy prices at car boot sale


Lux1
 Share

Recommended Posts

I had a look round the local car boot sale this morning. Four telescopes found, - all on bad mounts and very small apertures.

Of particular interest was a 3" reflector with a 4mm Huygens eyepiece, the seller only wanted £70!

He also didn't know how it worked as he demonstrated it to some people by looking behind the primary mirror and pointing it towards the sun!!:)

I just sighed and walked on....:p

Link to comment
Share on other sites

So sad....

Although sometimes you can get a real bargain. A friend picked up a Tasco 114 reflector on a little EQ mount with 20mm and 16mm EP's for the princely sum of £1.

Link to comment
Share on other sites

I know them scopes arnt any good, but a £1 what i would have bought it just to see what it was like...

I really am going to have to make my way to a few CB's this year, hopefully i could find a bargain or 2 :)

Edited by Keiran
Link to comment
Share on other sites

I know them scopes arnt any good, but a £1 what i would have bought it just to see what it was like...

I really am going to have to make my way to a few CB's this year, hopefully i could find a bargain or 2 :p

It be nice if you pick up a Cobra 148GTLDX on the cheap :)

Nadeem.

Edited by Deneb
Link to comment
Share on other sites

I've often seen these 3" reflectors and always walk pass them.

If you know your cameras and lenses you can make a few pound profit. I once picked up a mint Lomo LC-A for £2.50 and sold it on E-bay for £85.

Link to comment
Share on other sites

How about using them to build the NTA (Naff Telescope Array) .. Hundreds of car boot offerings in a field, all webcam'd up and linked to a central data and processing hub for real-time live HD stacking.

I'm sure we could also find a few ZX81's to guide the thing.

Link to comment
Share on other sites

How about using them to build the NTA (Naff Telescope Array) .. Hundreds of car boot offerings in a field, all webcam'd up and linked to a central data and processing hub for real-time live HD stacking.

I'm sure we could also find a few ZX81's to guide the thing.

I wasn't thinking so much of the NTA as setting several of them into a frame of - for example - a meter diameter, all aimed at a single secondary mirror.

Thinking extremely fast Newtonian, with a matrix of individually tunable mirrors.

Fair enough it might not necessarily give large observatories much of a scare, but it could be a potentially cheap route for an astro club to build a very large aperture telescope.

If the spherical mirrors don't appeal, how bout using parabolic 5 inch mirrors?

Crazy idea?

Alan

Edited by inksmithy
Link to comment
Share on other sites

I wasn't thinking so much of the NTA as setting several of them into a frame of - for example - a meter diameter, all aimed at a single secondary mirror.

Thinking extremely fast Newtonian, with a matrix of individually tunable mirrors.

Fair enough it might not necessarily give large observatories much of a scare, but it could be a potentially cheap route for an astro club to build a very large aperture telescope.

If the spherical mirrors don't appeal, how bout using parabolic 5 inch mirrors?

Crazy idea?

Alan

I like the idea, but don't even want to think about collimating it :)

Link to comment
Share on other sites

Hah yes, I would think collimating could be an issue, but I reckon its double with servos and computer monitoring and so on.

Raises the level of complexity, but would it be worth it for a 1 meter plus aperture?

I reckon that would be doable, I'm sure there is a big observatory with an active matrix of mirrors.

Alan

Link to comment
Share on other sites

Hah yes, I would think collimating could be an issue, but I reckon its double with servos and computer monitoring and so on.

Raises the level of complexity, but would it be worth it for a 1 meter plus aperture?

I reckon that would be doable, I'm sure there is a big observatory with an active matrix of mirrors.

Alan

But then, since they're parabolic and you want to focus them all on one point, isn't it just going to increase the fov? Or more probably, not work at all? :)

Link to comment
Share on other sites

Surely it would increase the photon count, giving a brighter image?

I dunno, its just a crazy idea which could be a bit of fun.

Be awesome if it worked though.

Alan

Yeah but to focus on the same point wouldn't the mirrors have to be pointing themselves at different parts of the sky? In which case you'd have a lot of trouble making sure the images don't overlap...

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.