SingAstro

Baffles within the optical tubes of telescopes like refractors are used to reduce internal light flaring that will cause a reduction in contrast of the image formed at the eyepiece end. Baffles are normally knife-edge thin and help to guide the light path "properly" into the eyepiece. Inte...

Hmmm....GOTO scopes probably is taken in the context of fork mounted versions like the LX200 or Celestron equivalents? They would suffer from field rotation issues but with the recent trend of short exposure imaging with DSLRs, i don't think it is a major vexing issue anymore. If the GOTO scope is b...

well, actually not all apochromats are triplets, some are doublets like the FS series refractors from Takahashi. Even the term apochromat is being defined or designed differently by different independent manufacturers. Are we taking Abbe's classical definition of apochromatism or more stringent defi...

Anyone here who knows where to get PII laptops second-hand?
Thanks in advance,
rcj

Haha...he is lucky! Working shorter hours there instead than in Spore!

Hi Novafusion, Thanks for putting up the information. Incidentally, orders for the XLs are closed for the first batch already. Thanks to those of you who have placed the orders, expected time of arrival would be sometime next week. Currently, it is only these few focal lengths that are available fro...

You guys going for any night cycling trips? let me know ya!
rcj

You can also try sp_astro at galaxynet

yeah....too bad it is too soon april 17 and 18!

Hi fizzy,
The aperture stop if in the middle of the tube is probably there to funciton as a baffle or judging from the "minds" of departmental-store-mass-production scopes, to limit the usable aperture of objective to minimize optical aberrations. :-)
rcj