3 aperture Saturn reflections (and refractions)
Posted 13 June 2013 - 12:04 AM
The 70mm achro does a very impeccable job of providing a high def Saturn but at the cost of simpler details. The hexagon is total shutout, though the equatorial Belt and accompanying zone stand out nice, if somewhat soft as its res is just 1.65 Dawes. The bottom line is sharpness but plainness. Cassinis shows nicely but its shorter and blunter appearing. I've NEVER seen the crepe ring, though the a-b albedo difference is seen regularly.
The C6 provides a yellower Saturn to Rangers grey cream. Everything g here is better than the 70mm as you'd expect. Cassinis follows out from the ansae , much farther infact, and the division at the ansae reveals real angular seperation as opposed to Ranger grey linear contrast streak. The physicality of he gap makes the 6" a more rewarding view than the flatter Ranger - which though does unbelievably well for a mere 70mm!!!
The 8" right off the bat has a darker Cassini division while through the ,
C6 its a paler shorter version. Both do a nice job but the c6 just doesn't have the 8"s clarity . The upper temperate zone that subtly visible in 6/10 seeing through the 8" isn't even beginning to tickle at the idea. The Hexagon is finally showing here as a spot while the same seeing yields a perfectly smooth and blank region in the 6". The 6" gives color and some more retain definition in the simpler details while the 8" begins to reveal the finer structures and contrasts. The C ring is routine in the 8" while the 6" needs good seeing.
My finds this year.
Posted 13 June 2013 - 12:33 AM
The C ring is routine in the 8" while the 6" needs good seeing.
Posted 13 June 2013 - 03:46 PM
Interesting comparisons Pete, thanks for posting.
I'm reminded, by the way, how much patience is called for in planetary viewing--two nights ago I had the 12.5-inch out, and the seeing was garbage for a long while. I viewed some DSOs and came back to the planet on a what-the-heck-let's-take-one-more-look kind of whim, and bang, the air was steady. For about 30 seconds! But wow, it's just so beautiful when the air is steady--the bands were etched on the planet, the various shadows were obvious, crepe ring, encke minima, etc very clear. And then the image dissolved once more into mush, and stayed that way. So I packed up.
Posted 13 June 2013 - 05:42 PM
Generally Ive found seeing later in the night is more stable than say : 10:00pm in August. After midnight it seems like some truly tranquil seeing conditions can really take hold. Same for 3:00am.
Ill say it WAS nice to get that sct out again!!!
Your accounts were good reading.
Posted 13 June 2013 - 06:21 PM
Posted 13 June 2013 - 11:44 PM
I'm glad you had a nice crisp image Rick!!
Posted 14 June 2013 - 08:02 AM
Posted 15 June 2013 - 08:30 PM
Posted 15 June 2013 - 09:05 PM
I have no doubt your 100mm would show it nicely in good seeing all the way around.