|
Hi Suzy
Bigger mirror, less dew.
with a fan, your mirror will be cool in 30 min. less if with a very simple mod you direct air flow over front of mirror.
collimation will be easy - 5 min each time at most.
I know a 60 year old lady with a 10" tube dob. she has no problems moving it around in her Nissan Pulsar.
My Vixen LVW 17 was a delight in my 12" f5 dob. I don't know about the pentax, but I don't think you're likely to need a paracorr at f5. And you will probably find planets better in poor seeing with a big scope as you'll have better resolution and won't push the magnification so mucj to see things.
Again, if you choose an 8" you will be happy. But really i think the only issue in favour of small is manageability
|