Hi,
Last night we got a a clear sky, at least I thought so. My friend invited me to follow him out to a dark place outside the city. My plan was to test my medium format lens on a object that I also have taken photos of with my more modern APO lens. We started about 7 pm. We have winter now and it's dark already at this time. As usually we got clouds drifting in over us. Still we could doing some astrophotographing but not very high quality of the images.
Anyway I have the photos here, both my old Pentax 67 medium format 165mm f/2.8 lens and the Sigma APO 150mm f/2.8 lens:
http://www.astrofriend.eu/astronomy/...n-cluster.html
The stars bleading over, the red and blue doesn't focus at the same place as the green wavelength as espected. The advantage of the old lens is that I can use it at f/2.8 compare to the APO which I set the aperture to f/4.0. I use these settings most to get the vignetting under control. But of course even the sharpness got better.
What I miss most is the focus motor that I have in my Canon lenses. Now when get used to control the camera (Canon 6D) over the smartphone I have found it very convinient.
One more thing I tested this evening was the new angled finder I bought to the Star Adventurer mount. What a difference, now I can place the polar star exact where I want it. Almost impossible to see throught the polar scope normally when living at +/-60 degree latitude. Even the red light lamp I have worked well. But I need another holder for it.
I will post more about this later on my homepage.
/Lars