Prism Diagonals Pros & Cons

Hi,I've always used celestron stardiagnol,, recently I purchased a celestron 90° erect image correcting prism,I've not yet used it.can anyone tell me what differences to expect and the advantage and disadvantage, if there is any,thanks.

On Monday, 22 May 2017 03:07:39 UTC-4, wrote:
Hi,I've always used celestron stardiagnol,, recently I purchased a celestron 90° erect image correcting prism,I've not yet used it.can anyone tell me what differences to expect and the advantage and disadvantage, if there is any,thanks.

Some thing prisms provide the best images, but the light has to traverse 2 glass surfaces and reflect off another, all while traveling through 2-5 inches of glass. A mirror only requires one reflection. Also, some believe prisms add chromatic aberration to the image. I had what was considered the best prism (Celestron 2" Baader from the 1990's) and IMO, a good mirror is better.

On 22/05/2017 08:07, wrote:
Hi,I've always used celestron stardiagnol,, recently I purchased a
celestron 90° erect image correcting prism,I've not yet used it.can
anyone tell me what differences to expect and the advantage and
disadvantage, if there is any,thanks.

Presumably on e of these as opposed to the more common simple Amici 45
degree prism.

https://en.wikipedia.org/wiki/Amici_roof_prism

Its claim to fame is that the image is the same way round as reality.

--
Regards,
Martin Brown

On Tuesday, May 23, 2017 at 5:42:40 AM UTC-5, Martin Brown wrote:
On 22/05/2017 08:07, wrote:
Hi,I've always used celestron stardiagnol,, recently I purchased a
celestron 90° erect image correcting prism,I've not yet used it.can
anyone tell me what differences to expect and the advantage and
disadvantage, if there is any,thanks.

Presumably on e of these as opposed to the more common simple Amici 45
degree prism.

https://en.wikipedia.org/wiki/Amici_roof_prism

Its claim to fame is that the image is the same way round as reality.

--
Regards,
Martin Brown

What's reality? Everything is upside down inside your eyeball anyway, and your brain just makes the best of it. Scientists have outfitted people with special prism glasses that turns the world upside down, and after a few days wearing these glasses the people begin to adjust to the new reality and see the world as before, right side up.

Razzy

On Tuesday, 23 May 2017 23:55:11 UTC+2, Razzmatazz wrote:
On Tuesday, May 23, 2017 at 5:42:40 AM UTC-5, Martin Brown wrote:
On 22/05/2017 08:07, wrote:
Hi,I've always used celestron stardiagnol,, recently I purchased a
celestron 90° erect image correcting prism,I've not yet used it.can
anyone tell me what differences to expect and the advantage and
disadvantage, if there is any,thanks.

Presumably on e of these as opposed to the more common simple Amici 45
degree prism.

https://en.wikipedia.org/wiki/Amici_roof_prism

Its claim to fame is that the image is the same way round as reality.

--
Regards,
Martin Brown

What's reality? Everything is upside down inside your eyeball anyway, and your brain just makes the best of it. Scientists have outfitted people with special prism glasses that turns the world upside down, and after a few days wearing these glasses the people begin to adjust to the new reality and see the world as before, right side up.

Razzy

It hardly needs mentioning that an A-B-C test of "straight through," prism or mirror diagonal will be enlightening.
If you can't tell the difference then what does it matter?
Except that you've saved some money for magical hi-fi cables. ;-)