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Binoviewer FOV and eyepieces question

Started by Guest_**DONOTDELETE**_* , May 26 2003 02:15 PM
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5 replies to this topic

#1 Guest_**DONOTDELETE**_*

Guest_**DONOTDELETE**_*
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Posted 26 May 2003 - 02:15 PM

Do binoviewers restrict field of view. For example I have ordered a TeleVue with 2x corrector for my F5 Dob. Now that I need double eyepieces I am wondering if paying extra for wide field would be a waste if the long path of the binoviewer restricts the FOV.

Thanks

#2 Guest_**DONOTDELETE**_*

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Posted 26 May 2003 - 08:43 PM

Not at all in my experience.The only problem is in being able to take the field all in with the very wide field ep's.I have used my 70*Axioms and the effect is one huge face full of stars.A much better view IMO than say a single 80* ep.Now that I know better about the results I only use 67* cheaper ep's and really love the view,just like a picture window in a spaceship :-).I don't use your exact setup but the result should be similar.
If you want to see something out of this world try a "starsweeper" in an SCT.It is a focal reducer that cuts my F10 scope down to F5.Super wide fields!I don't know if they are usable in a Dob though.Maybe someone else with a Dob can help you better.I think you will love it.

#3 Guest_**DONOTDELETE**_*

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Posted 26 May 2003 - 10:16 PM

TomM.,

I do agree with the use of the focal reducer in an SCT. Siebert makes one for the Tele Vue called the *Galaxy Viewer*, I've used it in my Bino Vue. At f/5 it gives great wide field views in an SCT. But for a Dob working at f/5, I do not think so.

DonR.

#4 Guest_**DONOTDELETE**_*

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Posted 26 May 2003 - 10:30 PM

Hi:

Depends on whether you are talking about apparent field or real field.

Apparent field of view does not suffer in most configurations.

Real field of view is impacted by the magnification factor of your compensator. With a 2X compensator, a 24mm Panoptic will have the magnification of a 12mm Pan. It will still have the same apparent field, just a smaller real field as a result of the magnification.

A focal reducer will not work with a Dob. The only telescopes they work with are SCTs.

Clear skies,
Jim

#5 Guest_**DONOTDELETE**_*

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Posted 29 May 2003 - 09:33 AM

Total newby! Does the Denk II require 2" eyepieces or can it be used with the 1 1/4" l have now?

#6 Guest_**DONOTDELETE**_*

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Posted 29 May 2003 - 09:37 AM

Hi Ernie:

The Denkmeier Two uses 1.25" eyepieces.

Clear skies,
Jim

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