Star elongation illustration for too close or to far does not apply to sct' s and their correctors?

[ricbrek]

I just talked with a Starizona rep who stated that the illustrations av star elongation for "too close" or "to far away"  from the corrector to the camera sensor does not apply to sct' s with correctors. 

Can anyone confirm this ? He said that illustration is just for refractor telescopes with flatteners

[michael8554]

"sct' s with correctors."

Do you mean "SCTs with Coma Correctors / Focal Reducers" ?

Or Edge HD SCTs, which have correction lenses inbuilt ?

My Meade SCT with a Baader Coma Corrector behaves like the "Too Close/Too Far Away" diagrams suggest.

Michael

[ricbrek]

4 hours ago, michael8554 said:

"sct' s with correctors."

Do you mean "SCTs with Coma Correctors / Focal Reducers" ?

Or Edge HD SCTs, which have correction lenses inbuilt ?

My Meade SCT with a Baader Coma Corrector behaves like the "Too Close/Too Far Away" diagrams suggest.

Michael

Well I dont know what to tell you, but the experts at Altair and at Starizona say it is only good for refractors. 

My scope is s standard C9.25  sct so the reducer/corrector is needed if I want to get down to an F6.3 ~~ FL. 

[Elp]

Due to SCT design and physically moving the mirror in and out when focusing (you also have much more focusing range than a refractor) your backspacing isn't so critical when the camera is on the backside (native and reduced FL) so I wouldn't worry too much about it.