Thinking of buying Coronado SolarMax II 60mm
Posted 16 January 2013 - 10:40 PM
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Posted 18 January 2013 - 09:45 AM
Aquarist, are you using the Lunt LS100FHa to double stack your Lunt LS100THa? Or did you go the Luntanado route?
No, I did not go the Luntanado route although some of the highly respected folks like Jim Lafferty did with superb results. Lunt was willing to customize adjustment since they were ordered together so that was my preference.
Posted 18 January 2013 - 09:47 AM
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Posted 19 January 2013 - 12:02 PM
I decided against this and installed a Moonlight motor focuser . I am now happy with my Coronado but if I had to do it again I would purchase a Lunt
Posted 20 January 2013 - 07:15 AM
- I hate the helical focuser. It's stiff and difficult to get a precise focus with.
- The extension tubes are sloppy.
-Terrible "sweet-spotting". Unless proms are almost directly in the center of the FOV, they're either very dim or gone completely, and this is through the BF15.
I just received an LS80 single stack, but haven't had a chance to use it, yet. I'm curious to see the comparison.
Posted 21 January 2013 - 12:53 AM
At 560mm, the solar disk takes up about 1/2 or so of the field of view with the eyepiece on the longest FL setting. The full disk almost fits on the chip of my e2v Flea 3 (1/1.8"). There's plenty of room horizontally, but just not quite enough vertically, so at natvie focal length, I'll need to do a 2-panel mosaic for a full disk.
Details were good all around the disk with the surface detail not as defined as with the SMII, but not unexpected with a SS vs. DS. There does seem to be what I would term as "backscatter", but I honestly can't remember whether the SMII exhibited the same thing. No reflections or kidney beaning with viewing on axis, but you could see the etalon's center spot when you moved your eye off axis. Again, not unexpected and I've seen similar issues with the SMII.
The tuning of the LS80 is more subtle than with the SMII. Where with the SMII's internal etalon, you can make fairly large moves with both the internal and external etalons, the pressure tuner takes more turning to affect the on-band tuning. I haven't decided if this is a good or a bad thing, or just a different thing.
I'm looking forward to spending more time with the scope and still debating about the purchase of the DSII double stack module. I've been reading mixed reviews of performance of the stacked PT modules vs an external etalon.
Also, just a small kudos to the Mini-Tower mount that I borrowed from my club. I'm continually impressed by the simplicity and yet accuracy of this mount. Not wanting to deal with the cold and wind today, I set up in the hours next to an open window. Even without a positive GPS lock (just used the previous sessions's settings) and not quite exact leveling, the mount managed to place the sun almost dead center in the FOV and keep it there. For grab and go goto, this thing can't be beat.