Jump to content

SkySurveyBanner.jpg.21855908fce40597655603b6c9af720d.jpg

Barlows vs E/P Projection


Recommended Posts

I'm on a bit of a tight buget! and want to have a go at webcam imaging with my Celestron C4-R 4" refractor, ok I know it's not the ideal scope for this with only a 1000mm focal length but the optics are superb.

I managed to get myself a Philips SPC900 webcam and adaptor with a uv/ir block filter too.

I am new to this imaging lark and would like to know the best method to go for? a decent 3 - 4x barlow or the eyepiece projection? what are the pros and cons of each? Cheers.

Link to comment
Share on other sites

I doubt I will ever be a "serious" imager - I just wanted to give it a go! Whereas it's true that for planetary imaging, you need high F-numbers or significant barlowing, I went the other way, removed the diagonal, used a "barefoot" extension tube, plus focal reducer, to capture FULL disk lunar / solar images. Somehow appealing to me! :(

I think it's conventionally claimed that eyepiece projection is "harder", but I gave that a go anyway! I sense we Baader Hyperion owners have an advantage - There's a simple screw-on adapter for most things... and to locate a Webcam accurately behind the e.p. :p

TBH, when I'd got it sussed, I found (Hyperion) e.p. projection, rather more flexible. The 24mm e.p. provided about the same image scale as the bare telescope objective. Higher (semi-infinite!) magnification was easily acheived with shorter focal length eyepieces, without fiddling overmuch with "extensions" or "wondering where the focus might be" <G>. Significantly I didn't get the annoying VIGNETTING with e.p. projection?

Maybe misguided, but I think BOTH (and more) methods merit exploration? ;)

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • 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.