A few people have asked about drawings and dimensions for my Moraharpa. I worked from various sources online but drew my own, and worked out what I would need for a keybox similar to a kontrabas keybox; I did not want the “authentic” original and rather limited keybox.
The body is finished now, but I am still finishing fitting the keys in the keybox!
I have been waiting for a suitable occasion in nice weather to record this for a month or two. The tune has been on my list of those to learn properly for a while, and I think “Pigopolskan” is a great tune.
Recording near some running water seemed like quite a good idea, and I think it was. I must get a wind shield for the recorder though, there are one or two blowy moments. In fact I used this first proper take rather than the second as that one began with a loud buzzing insect on the microphone!
Flying the Ingenuity helicopter carried on the NASA Perseverence rover is quite a feat. It has to be done completely autonomously; Mars is currently over half an hour away for round trip radio signals, so remote control is not an option. There’s no GPS to help navigation either!
A pity they couldn’t have tracked it off to the right as well, but at least it came back!
I decided that I wanted to try a Bahtinov mask for focus tests on the 3 inch refractor, after having tried one on a telephoto lens with some success. The Moon was about so I thought it could be a good test. This image is what I managed purely by using live view to focus. The live view was monitored on a tablet, by using the HDMI output from the camera, and a video capture dongle. Continue reading →
Yesterday’s image of M44 Praesepe, or the “Beehive” cluster. This was taken using my old 135mm Pentax fitting lens, with a mild Barlow in the Pentax to Nikon adapter. I use it because it’s faster than my other lenses; f/2.8 as opposed to f/5.6 on a telephoto set at 200mm, or f/4.5 on a zoom set at 70mm. The image quality is not as good as that from the Nikon zoom set at 200mm, but exposure times are much shorter. I need to be patient!
The image is from a total exposure of 240s, and (at last!) with a flat field applied. I took a set of twilight sky flats for all my lenses, so that I can do more experiments.