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Astrophotography and Sketching >> Sketching

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Heidescoper
sage


Reged: 11/21/10

Loc: Niedersachsen, Germany
Re: The Western Veil new [Re: PeterDob]
      #5942444 - 06/27/13 02:24 AM

hi all,
Peter:
when I see Your sketch I have a real feeling to view in an eyepiece ! I like the star colours too .
The Baader-OIII is a narrow Filter.
You need more aperture as with a Lumicon OIII or Astronomik but with 18" You make all right !

Bye
Christian

Edited by Heidescoper (06/27/13 02:25 AM)


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PeterDob
scholastic sledgehammer


Reged: 07/29/05

Loc: CarĂ¹, Italy
Re: The Western Veil new [Re: Heidescoper]
      #5947700 - 06/30/13 08:59 AM

Many thanks, Ken and Christian. Indeed, an OIII filter is quite narrow. But for the Veil it is just perfect because it brings out every subtle detail. However I disagree that this filter should be reserved for larger telescopes. It only depends on "how" you use it and what for. Generally you should consider that for an OIII filter the maximum mag is about 8-10x the scope's aperture in inches. Obviously it also depends on the sort of objects because on small but bright planetaries you may push the mag even much higher. Now suppose you have a 4-inch fast refractor. It is perfectly possible to use the OIII at low mags and observe the Veil in its totality, or why not the North America nebula?

Peter


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azure1961p
Postmaster
*****

Reged: 01/17/09

Loc: USA
Re: The Western Veil new [Re: PeterDob]
      #5948633 - 06/30/13 08:27 PM

Very true Pete. The OIII would conceivably be fitting got a 25mm aperture if it existed so long as it applied to the 8-10x per inch of aperture. I find that's the ideal magnification but even 25x-30x per inch of aperture has proven effective. Its more striking at lower mags like the 8-10x RoT but its still helps on planetary NEB etc.

When these filters first came out done if the press or reviews rather wrongly peddled it as a larger aperture accessory. Then I went to a star party and saw the truth of the matter.

Good points Pete!

Peye


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