Last night we had some clear skies. Cloudy nights (the atmosphere,
not the website) delayed binoviewer testing with the new 18" dob.
Transparency decent, seeing atrocious. Urban backyard , red zone.
First target was Jupiter. At 133x both main belts plus a couple more N and S visible. Fainter belts closer to the poles came and went with the seeing. The GRS was away. numerous belt irregularities and festoons were apparent. Jupiter was still low and the seeing poor, but the BV gave a pleasing view. Good presentation and comfortable.
The next test was binoviewer plus Paracorr. It's been my normal procedure to not use the Paracorr w/ BV. The added weight was not a problem and still within focus range. The one issue with my setup- I'm not using the standard TV 1.25" adapter. Have to be carfeful not to hit the Paracorr lens with the BV 2x amplifier nose.
With the Paracorr I have the following magnifications and exit pupils:
24 Pan 153x , 3mm exit pupil
18 Delite (modified) 204x , 2.2mm
14 Radian (modified) 263x , 1.7mm
10mm Radian (modified) 368x, 1.2mm
I tried all magnifications. 204x seemed to be the best choice for the wavering atmosphere.
One great feature about these eyepieces: they're pretty much parfocal.
Next up was M57. The other night I observed it with a single EP. With the BV it appears to float in space in front of the background stars.
Then globular M5. It's a little dimmer than monoviewing, but I see the granulation and detail easier.
Last target was bright PN 6572 in Oph. Not as famous as the Ring, but brighter and colorful. Easily seen in 50mm Finder. The green color and oblong shape apparent at 153x.
It it was nice to have one clear night. Only one - it raining tonight.
In in the photo the 18" is the one on the left- shown next to a 36"