I write to praise the F/6 reflector, which is becoming more scarce, just when it should become more important.
Right now, a person can pick up an F/5 150mm reflector rather easily. But F/5 is not a very friendly place to be for anyone not wanting to spend the big bucks for a coma corrector, not to mention the heightened collimation requirements first for F/5, then for F/5-with-a-coma-corrector, if someone goes that route.
I am not trying to dismiss astrophotography needs. I would be the first to agree that F/5 is probably better for them, but any F/5 reflector with a simplistic single speed Crayford isn't really meant for them in the first place. If it's not for them, why try to force this on the visual world?
Certainly, an F/6 reflector, like the GSO 6, is a very large scope to mount on an EQ or other refractor-like mounts, but an F/6 6" dob would offer something different than the ubiquitous, but somewhat redundant 6" F/8 dobsonian for the visual observer. Don't get me wrong, I like the 6" F/8 dob, but wouldn't an easily accessible 6" F/6 dob offer most folks a whole lot more, in terms of wider true field of view, without introducing intolerable amounts of coma. The market is ready.
Likewise, a 130mm F/6 scope would be nice offering, too. Again, no coma corrector, and still not too huge to fit on a reasonable EQ or alt-az mount. Not a big fan of the tabletop mounts -- I will concede making a dob of this size would be slightly more difficult, but one could probably use the 6" F/6 base from the previoius paragraph with some minor modifications. But even if it only came with tube rings, it's something I would be interested in, and think the market would like such a choice, too. And a 2" focuser on this is a necessity, preferably at least a single speed crayford. Both scopes should come with some kind of padded case. Metal would be great, but even just a padded soft case would be fine.
What do you think?
Edited by CollinofAlabama, 24 November 2020 - 03:06 AM.