Myth #6

[Mick]

I found this article interesting especial myth #6. Maybe it's how different people see things but it dos fly in the face of most peoples ideas. It has also been written buy a telescope manufacturer which made me wonder, what do you think about these are they myth or not?

Telescope Myth (http://robert.thegeakes.co.uk/astro/stuff/Telescope%20Formulas.htm)

[atalas]

Hi Mick

Yes ,no doubt that a good quality barlow will not degrade the image!

For myself I like good eyerelief,I use the ultima barlow not the best but a good one.

Louie:astron:

[Starkler]

Anything added to the light path will degrade the image. Its just a matter of what is visible and acceptable.

A barlow adds extra elements and air/glass surfaces to scatter light. To minimise this effect make sure you get a quality one.
The words "fully multicoated" carry both a price and a performance premium in this regard.