A Tale of Two Full Disks
Posted 06 January 2013 - 11:09 PM
Below is taken with the SMII 90 and the .5 Scope Stuff reducer:
And here is a 4-panel mosaic of a full disk taken at native focal length:
The reduced image has nice surface detail but almost completely loses any prominences. I also find that the scope has a bit of a sweet spot that force me to shove the sun up into one corner to get any semblance of even illumination. Is this something that's overcome with the Lunt pressure-tuned scopes?
This sweet spot also shows up in the mosaic as shading in the disk where the panels were stitched together but the individual images don't quite match up.
Finally, I tried some detail shots with the 2X Cemax barlow, but it's tough to get decent data with a camera that only does 12fps. I'm still pondering getting a Blackfly e2v CMOS camera now that they've been released.
Posted 07 January 2013 - 06:58 AM
Posted 07 January 2013 - 08:13 AM