Pentax PF 100ED?

cpppfeffer · Guest

I would need advive on the following:
I am very interested in the Pentax Pf 100ED using it for both terrestial as well as astronomy
Will the image quality be any good above 100x magnification?
Or will I be better off using a telescope as a spotting scope such as the televue 85?
Thank you!

opticsplanet.com · Posted: Fri Feb 25, 2005 6:08 pm Post subject:

Hi

If you are talking about using the Pentax 100ED at 100x during the day, the answer is, yes, it would do an excllent job IF (and that is a very big if) the atmosphere will allow it.

Always keep in mind that atmospheric turbulence during the day puts a cap on how much magnification you can actually use and still retain a useful image. On some days this may be as little as 30x, but on others it may be 60x or more.

I have been able to use over 60x frequently in arid, western states, but very seldom in the more humid east.
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cpppfeffer · Guest

Hi Jne,
Thanks for your swift response.
Also, do you know if the scope can be fitted with a 2x barlow objective?
Again, thank you for your time.

Warm regards