Mercury Transit -2

One of our long-time customers – Kok Chen, Portland Oregon e-mailed me his quick update on the transit just after I drove back from Salton Sea yesterday. Chen san, very nice Ha and Mercury image!!, even in very short chance of capturing between clouds. His image and detailed report are as follows;

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Here is a shot of the Mercury transit taken at 1752 UTC on a Solarscope SF-50 and Borg 55FL.

The train is SF-50 > 55FL > 7602 > 7517 > 7504 > Solarscope rear filter > 7425 > 9857 Crayford > camera (T2 thread).
Notice that I took out the hood from the 55FL. The SF-50 is connected diectly to the 55FL objective with a 60mm – 67mm step up ring.
The camera is an ASI-178 MM.  It replaced the ASI-174 MM plus 2.5x Powermate that I initially used, because the PowerMate was giving me Newton rings.  This direct to camera has no Newton rings that I could see.  The pixel size of the ASI-178 is 2.44 times smaller than the ASI-174, so the result is almost exactly the same pixel scale as the ASI174 with the 2.5x PowerMate.
Notice that the Takahashi counterweight is retracted all the way (and it is still too heavy), that is why I need a lighter counterweight, ha ha.
The Hinode works wonderfully still (notice that it is attached to the threaded screw holes of the 7517).  The 9857 focuser is also quite good, by the way.
The red cap at the end of the EM-11 polar axis is a mount for the QHY PoleMaster (which of course is not useful in the daytime :-).  I actually only received the Polemaster a week ago and haven’t had the chance to try it yet.
There were clouds until about 9:30 am here, and a little after I took the Mercury picture above. bands of clouds came in again.
Seeing was pretty bad.  Mercury was an oval much of the time, with 2 ms exposure time.
The 2 msec is with analog gain set to 0 dB; the ASI-178 is a very sensitive camera!
I captured the image using my own program on the Macintosh that uses the ASI SDK.
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This is his very unique and interesting setup. Wonderful! I’m glad to know he is enjoying BORG system with his own idea. It is interesting to know that setting Hinode SG at top of 7517. I didn’t realize that. SF-50 recently he got looks performing as expected. Even single shot shows the details of the surface.  Chen san, thanks for posting your result.
To any other people, please post your result to share with us too.
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~ by tedishikawa on May 10, 2016.

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