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Ajohn
sage
*****

Reged: 12/03/07

Re: Herrig new [Re: Dave O]
      #5604425 - 01/04/13 10:02 AM

Thanks Dave. I would suspect that the design could be trimmed up based on how the radii finish up after they are made. From literature that seems to be possible with all of these types of design.

The tilts I referred to were based on playing with the design in oslo. To be correct the tilt angle differs the 2nd time the rays strike the same mirror. Unfortunately as far as I am aware oslo can't cope with that which would make optimising difficult.

Personally the shallow convex puts me off.

John
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ed_turco
Pooh-Bah
*****

Reged: 08/29/09

Loc: Lincoln, RI
Re: Herrig new [Re: Ajohn]
      #5608956 - 01/06/13 05:54 PM

Quote:

... I have used an 8in sct and a 5in F9 APO and would say that the increased contrast of the apo makes it a better scope. Retaining contrast on many objects is very important.

John
-



You compare an 8" SCT with close to a 35% CO with a 5" APO and say the APO is better? I wouldn't want to compare anyone's telescope with an SCT. Most SCTs will tend to make anything look better...


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MKV
Carpal Tunnel
*****

Reged: 01/20/11

Re: Herrig new [Re: ed_turco]
      #5609097 - 01/06/13 07:31 PM

Quote:

Quote:

... I have used an 8in sct and a 5in F9 APO and would say that the increased contrast of the apo makes it a better scope. Retaining contrast on many objects is very important.

John
-



You compare an 8" SCT with close to a 35% CO with a 5" APO and say the APO is better? I wouldn't want to compare anyone's telescope with an SCT. Most SCTs will tend to make anything look better...



+1! Talk about apples and oranges...


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