Re: zoom eyepiece

On Fri, 27 Feb 2009 07:33:37 +0000, Malcolm wrote:

In article <Q5GdncOZCtkqgzrUnZ2dnUVZ8sXinZ2d@xxxxxx>, Duncan
<dunks.spamcan@xxxxxxxxxxxxxx> writes

"Alan Gardiner" <alan.gardiner@xxxxxxxxxx> wrote in message
news:6a127eedkjow$.1rvyp750y1fuk$.dlg@xxxxxxxxxxxxx

The only thing I would add to Malcolm's comments is that if you intend to
use the telescope for digital photography then the choice of eyepiece is
critical.

If the eye relief is not large enough the image will not fill the field of
view of the camera. The only way to be sure is to test your digital camera
against the eyepiece.

I use fixed magnifiaction eyepieces since at the time I was not impressed
by the quality of the zoom eyepieces, they have improved a lot recently
and
are very versatile.

Alan

I'd add as well that the twisting ring of a zoom eyepiece can be a right
nuisance if attaching a digital camera, depending on the type of mount you
use. If the camera lens is not dead centre on the camera, its weight pulls
the zoom ring around so you will have to use the zoom lens at either its
maximun or minimum focal length (unless you can put up with corner-ways
pictures!). Another problem I had was that the zoom ring was slightly
different in diameter from the lens barrel, so my digiscoping adapter did
not grip it securely - a problem solved by adding a piece of split plastic
pipe between lens and adapter.


Good points, Duncan. They've not affected me because I've never
digiscoped, preferring to go down the route of digital SLR and telephoto
lens.

That produces the best quality results without doubt but digiscoped
pictures can be almost as good in ideal conditions. There are extremely
valuable for record submission purposes if the species is one needing a
description and it cuts down the amount of equipment that has to be
carried.

You can see a few of mine at
http://www.facebook.com/album.php?aid=9115&id=1663539518&l=b0e1d

The quality is quite variable but it gives and idea of what can be done.

Alan
.

Relevant Pages

  • Re: European trip ?s
    ... This is not some new-fangled specialty camera sporting ... gives you the benefit of both a wide-angle and a 5X zoom lens in one ... Kodak says the camera has a 5X optical zoom ... We tested the distortion of both the 23mm wide-angle and the 39- to ...
    (rec.travel.europe)
  • Re: Stepping Up to DSLR - Canon 350D
    ... you know it is a zoom lens, because it is giving you the low-high focal ... lengths that the lens is capable of achieving. ... still all figured out by the camera, but you can override it when you ... you composed your shot, pressed the shutter, then accidentally moved ...
    (rec.photo.digital.slr-systems)
  • Re: Wild M420
    ... probably because I'm usually trying to get images from a stereo stand! ... the superb M420 zoom is nice to have.... ... the relay optics between the Makro zoom module and the camera ... your camera, relay lens, or imager. ...
    (sci.techniques.microscopy)
  • Re: Why does older CoolPix-995 work with scopes, and DSLRs will not?
    ... remove eyepiece and camera lens, ... Use special relay optics designed to couple the scope to the camera, ...
    (rec.photo.digital)
  • Re: Please indulge me .......
    ... Would not spending that extra money on better lenses more than ... What would be a good two lens package? ... Checkout the Tamron 18-250mm zoom, ... I think this camera will fill my needs and I won't outgrow it in my ...
    (rec.photo.digital.slr-systems)