Buying lens and mirrors

[orfest]

Hi friends,

I'd like to make this sunspotter device for my personal use.

It seems that I need to buy the following components:

- Achromatic lens, 60mm, focal distance 700mm

- Mirror 50mm x 50mm

- 2 Mirrors 25mm x 25mm

 

But I can't find any website selling any of those .

I've seen lots of parabolic mirrors being sold in sizes >= 6'', I've seen tiny achromatic lenses, or lenses costing a fortune.

Any advice on where to get lenses and mirrors is appreciated.

 

I haven't looked for the plywood yet, but getting it should be easy  

 

[Ben the Ignorant]

https://teleskop-austria.at/index.php?liste=36_Linsen-und-Spiegel#m

[orfest]

Thanks!

These mirrors are cheaper than on edmundoptics.com , but I still can't find a lens that is 60mm and f/12.

[Astrobits]

You could try contacting Ian Poyser:

http://irpoyser.co.uk/lenses/

He might have something suitable not listed on his web site.

An alternative source for the achromatic doublet is to buy an old refractor telescope such as the Tasco type and take the lens from that.

Flat mirrors can be obtained from old photocopiers but you would have to cut them down to size.

Nigel

[orfest]

I decided to buy a smaller lens (50.8mm instead of 60mm) from https://www.thorlabs.de/thorproduct.cfm?partnumber=AC508-750-A

and flat secondary elliptical mirrors on http://www.teleskop-express.de/shop/product_info.php/info/p5216_GSO-Fangspiegel---46mm-kleine-Achse---elliptisch.html