60 deg prisms for sale

[Merlin66]

Need to raise some cash to finish the MkII spectroscope....
Selling these BK7 and SF2 60 degree, 25mm x 25mm prisms. Ideal to build a simple specroscope or to replicate Hutung's observations of planetary nebulae. Can be used directly behind any eyepiece to "resolve" planetary nebulae from the starry background. Incorporated with a finder type telescope and camera lens possible to construct a very capable spectroscope to show the dark elemental lines in the solar spectrum, or stellar emmission spectra for analysis of spectral type and prepare your own H-R diagram. Enough of the sales pitch......

I've got three prisms ( which can be combined to further increase the spectral resolution, the higher the refractive index the higher the dispersion!!)

One only, BK7, 25 x 25, Refraction Index 1.517 $ 12 anywhere in Oz
Two only, SF2, 25 x 25, Refraction Index 1.648 $ 30 each anywhere in Oz

A bargain you can't affort to miss, in the original packaging.

[Volans]

G'day Merlin,

Can I use any of these prisms with the spectroscope I already have?

Peter.

[Merlin66]

Not really, may give a bit more dispersion if placed infront but the visual spectroscope already has three of these prisms inside the tube hence the resolution. Would be ideal for someone making their first spectro... they'll be over the moon with the results. Every astronomer should have one in his/her box. At these prices you won't find a better bargain this side of the Pacific.

[Merlin66]

Where's the sense of adventure... to boldly go where you've never gone before..... 99% of mankinds knowledge of the stars, galaxies and cosmos has come though spectroscopic observations. Here's a chance to replicate what Issac Newton did, George Hale and others. The entry price is minimal and the results amazing.