Lens

[TrevorW]

Anyone know a good cheap source for achromatic lens, I'm thinking of making a spectrograph also diffraction gratings etc

[gregbradley]

Originally Posted by TrevorW

Anyone know a good cheap source for achromatic lens, I'm thinking of making a spectrograph also diffraction gratings etc

Edmunds Optics.

Greg.

[chrisp9au (Chris)]

Surplus Shed in the USA have a big range.

https://www.surplusshed.com/search_lenses.php

Cheers, Chris

[Merlin66 (Ken)]

The objectives from a cheap pair of 8 x 30 Kmart binoculars work well.
Surplus Shed usually have some good stuff, Thorlabs/ Edmund are also good but very expensive!!!
Reflection gratings - I always buy from Optometrics (now part of Dynasil)
https://www.dynasil.com/catalog/diff...hick-standard/


The 600 l/mm is a good starting point.
Check out our webpage:
http://www.astronomicalspectroscopy.com/instrument.html


Any questions....just ask.

[TrevorW]

Thanks for the replies

[TrevorW]

Project killed by excessive freight charges nearly $150US to ship a 1kg package from Thorlabs, $30EURO the same cost as the item to ship a 100gram package from Europe, so much for amateur science