A thunder storm

We did get an inch-and-a-half of rain and the landscape is greener.  During the storm, I tried out the video feature of the Canon 60Da because we were getting quite a lightshow.  The camera was running at 59.94 fps.  The CMOS sensor reads out from top to bottom,  so it records only partial frames of short duration events like  lightning flashes.

Here are 3 consecutive frames:

lightning storm

Apparently there are several flashes recorded.  A snippet of the movie is on YouTube.


Scutum from Rancho Hidalgo

Here’s the result using the Canon 60Da on my little tracker head.  I spent a lot of time fooling with these in Pixinsight and then Photoshop.  Unusual for this part of New Mexico, I had problems with gradients due to smoke from wildfires in Arizona.  (See https://www.jjmcclintock.com/?p=139) I believe this is stacked from  5-180 second exposures. Images were collected May 18, 2012.

Scutum region, 5 x 180 sec, Canon 60Da; 28-135 lens at 28mm; f/8, ASA 3200

Canon 60Da First Light

At Rancho Hidalgo, I set up the Canon with my standard 28-135 zoom and the tracker head.  The tracker has a small polar scope, and the alignment just uses that.  I shot constellation scale tests, mostly at 28mm with ASA from 1600 to 6400. Here’s a 3 minute exposure of the Scorpius region at 6400.  There’s no calibration.  I adjusted levels and curves in Photoshop. There’s more noise in the image than you would want, but I found that ASA 3200 was acceptable assuming use of dark and bias frame sets and stacking multiple frames to reduce noise.  The greenish crap on the lower third is due to smokey haze from Arizona wildfires.  See https://www.jjmcclintock.com/?p=139.

Scorpius area. Canon 60Da, 180 seconds; 28mm at f/8 ASA 6400. Not calibrated,  but levels and curves were adjusted in Photoshop.