I took my Starblast out again last night for a quick look. I didn't have much time and wasn't able to wait for the moon to rise unfortunately so it's a limited report.
I had with me: 12mm Delos, 5.5mm Meade UWA, Televue 2x barlow (wanted to compare my barlow'd Delos to my new Meade) and using my soon to be returned Orion 1.25" 90 degree mirror diagonal
The Delos was great in this scope. Crisp views, nice FOV and decent magnification. I've never been a double star guy other then some of the really easy ones and most of the time I've come across them by accident but last night I came across Sigma Orionis and Struve 761 which I had never seen or at least had never know was a multiple star system. Both star systems were easy and looked fantastic in the Delos. Also based on Jon's challenge I attempted to split Alnitak. Unfortunately I didn't research what it should look like so I thought I split it but I think what I found was the 9th magnitude C companion? It was very dim an fairly far from Alnitak so after coming in and reviewing I don't think I saw the B star at all. I also wasn't sure what magnification I should use - I tried combinations of the 2 eyepieces and barlow and didn't see it. BTW I wasn't very happy with the 5.5m Meade. It was significantly darker view then the barlowed Delos but I digress.. Also I think I've got a newly formed interest in double stars.
Orion Nebula was excellent in the 12mm Delos.. Trapezium easily split but no sign of E/F which I think would be difficult/impossible with this small of a scope?
M31 in the Delos was not as nicely framed as the 24mmPan and with the rising moon brigtening the sky I wasn't able to detect M110 like I was the previous night although M32 was there. I'll look again before the moon rises as I think the Delos will be great in dark skies.
One of my goals last night was to get a sense of CA in the scope as I hadn't seen any at all the previous nights deep sky observing but I wasn't looking at anything bright either (clusters, galaxies, nebula). As I mentioned the moon wasn't fully up yet so I opted for viewing a low in the sky Jupiter and Sirius.
Jupiter - Some false color around the rim with the Delos. About what I would expect from a good achromat. Far, far less then the 120mm/f5 I owned which was awash in color on the moon and planets. I was able to see the north and south equatorial belts easily but the image was small. Had a little trouble reaching focus but this was IMO due to the seeing vs a single speed focuser. I don't think a fine focus would have helped much here.
Next up I put in the 2x barlow with the 12mm. Much better! A lot less CA - really negligible and possibly would have been mostly color free if the seeing was better and Jupiter was higher in the sky. Color was limited to the edges and nothing on the surface. Easy to see the equatorial belts and bits of structure in the temperate zones but seeing being what it was. Next I put in my 5.5 Meade.. Similar views although the barlowed Delos was noticeably brighter and sharper. Also the grease oozing out of the Meade where you twist up the eyecup??...what the heck!! I ended up getting grease all over my hands and focuser knobs and had to wipe it on my jeans every time I used it Definitely returning this eyepiece.
Sirius - Sirius was low in the sky at my latitude and in focus it had a purple halo as was to be expected. Good thing I never look at Sirius in small scopes
Overall I'd say the color is well controlled and not a problem for the price (and for the record CA kind of bugs me). I also think that the seeing/altitude of the objects certainly added some to the false color I saw so it's hard to tell where seeing ends and color correction starts but for sure on these very bright objects there is some CA. I also agree with David that this aperture loses light fast as you increase magnification but part of it is the eyepiece choice I think as well. There was a very noticeable brightness difference between the 5.5 mm Meade vs 2x barlow+12mm Delos and all things being equal I would have expected the brightness to be similar with those focal lengths.
Next up is the moon and hopefully if the atmosphere settles down a proper star test.
BTW another minor quibble is that I was seeing some very minor reflections again last night. I'm not sure if this is the scope, eyepieces or the diagonal. I'll be getting a new diagonal early next week so I can compare. The scope is really well baffled and the interior paint job looks to be excellent and flat so I'm not sure how the scope could be causing this. I'm hoping its the EP/diagonal or some combination of the two.
Edited by mikee, 10 January 2015 - 10:07 AM.