Quote:
Originally Posted by CosmoSat
Hi Renato,
You might find this interesting, that the Pentax series of XW eyepieces are in consistence with the first range which u prefer for a f/5 telescope,
Exit pupil----0.5-----0.7-----1-----1.4-----2-----2.8-----4-----5.6------8
FL------------------3.5-----5------7------10----14-----20----30(28)--40
The eyepieces I have as of now which I use in f/5 or f/6 scopes are 6mm, 10mm, 15mm and 20mm in the high to mid power range. 15 being the most used on dso's(hunting and general observing) followed by the 10mm(observing details) and then the 6. Sometimes I do 2X barlow the 15mm for small plaqnetary nebulae as it has a wider apparent field of view and a longer eyerelief than the 6.
Clear Skies!
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Thanks. I was unaware of that interesting observation about the Pentax eyepieces.
Interesting that you too are using 3mm and 2.5mm exit pupils for DSOs, like lots of other here.
Maybe it's because I'm a relic of the pre-GOTO days, but I did try 1.5, 1.8, 2.6, 2.7 and 3mm exit pupils for hunting galaxies and all those little clusters in the Magellanic clouds. But I always gravitated towards my 2mm exit pupil eyepieces in my f/10 C8 and f/4.5 Dob because it made things easier for me than with those other exit pupils.
Though in my 80mm refractor, I must admit that I do tend toward a 2.6 to 3mm exit pupil most of the time.
Regards,
Renato