Re: Smaller hole in telescope's cover


"David G. Nagel" <nagel@xxxxxxxx> wrote in message news:13743ujliil2762@xxxxxxxxxxxxxxxxxxxxx
Tater wrote:
On Jun 14, 2:04 pm, galwacco <claudio.ferna...@xxxxxxxxx> wrote:
Hi, I am seriously new to the world of reflector telescope maned
astronomy.
I have one weird doubt that I just couldn't manage to find any answers
about that.

I just got my first reflector telescope! It's a 4" aperture,
equatorial, the point that made me really curious was the cover that
came along with the telescope.

Of course, a cover is to protect the telescope against dew and dust,
the thing is that the cover has one whole of about one inch and this
hole also comes with a cap! I wonder what is that whole for?

Am I supposed to use the telescope with that cap on but only with the
smaller whole opened?

Sorry if this Q is just too stupid, I couldn't help but just ask it!
My curiosity was killing me!

I have a similar scope

I've found that the contrast of the moon becomes much better, but it
could be my imagination.

Nope, you are not imagining things. The use of the cover with a hole in it acts to reduce the massive amount of light reflected from the moon. This decrease in light makes your eye work easier and does increase the contrast.

Dave n

Something I have always wondered about these holes (which are also useful for terrestrial use of the scope).

Why do they make one hole with an area of (say) 1 square inch, instead of three smaller holes spaced as far apart as possible? That way you would get the full resolution of the telescope and reduced light, instead of reduced light and reduced resolution.

Seems to make no sense to me ....


.

Relevant Pages

  • Re: Smaller hole in telescopes cover
    ... I just got my first reflector telescope! ... could be my imagination. ... The use of the cover with a hole in it acts to reduce the massive amount of light reflected from the moon. ...
    (sci.astro.amateur)
  • Re: Smaller hole in telescopes cover
    ... astronomy. ... I just got my first reflector telescope! ... Am I supposed to use the telescope with that cap on but only with the ...
    (sci.astro.amateur)
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