Testing Nikon TC-17E II and TC-20E III with Nikkor AF-S 70-200 1:2.8 ED VR and Nikkor 200-400 1:4 ED VR
For more than one year I am now carrying Nikon's 2x teleconverter TC-20E III in my camera bag. I bought it from a local store in good used condition, with intent to get more reach with my Nikon D300 (which is APS-C sized) and the Nikon AF-S 70-200mm f/2.8 VR lens. Since ...
SVT Local News Report: Light Pollution in Stockholm
The Swedish public broadcaster SVT recently made a short report about light pollution in Stockholm, for which I was interviewed (German and Swedish). Swedish readers might find this story about light pollution in Stockholm interesting. Jonatan Loxdal, reporter from the ...
Light Pollution Article published in Swedish popular Astronomy Journal
Light Pollution over Stockholm, Sweden (Gamla Stan) My article about light pollution in Stockholm, Sweden was just published in the current issue of Populär Astronomi (Swedish). A less-colorful English version is also available: Light Pollution in Stockholm, Sweden ...
Nikkor Lens Comparison for Astrophotography AF 80-200 f2.8 ED vs. AF-S VR 70-200 f2.8 ED
I bought two used Nikon lenses, both very similar in their specifications, which is not surprising as the Nikkor AF 80-200 f2.8 ED is a precursor of the Nikkor AF-S VR 70-200 f2.8 ED (see Ken Rockwell's history page). With the highest bid, I got the 80-200mm for 280 EUR + ...
Observing Comet C/2013 US10 (Catalina)
Comet C/2013 US10 (Catalina) was first discovered by the Catalina Sky Survey on October 31, 2013. It originates from the Oort cloud, a vast spherical reservoir of comets far beyond Neptun. By chance, gravitational perturbations can push Oort objects into the inner solar ...
The artificial Skyglow above Stockholm and Why we care about it
On October 24th, 2015 I was invited to give a talk at the Swedish astronomy day ("Astronomdagarna") in Uppsala. You can find the video stream of my presentation below. I talk about the impact of light pollution on wildlife, ecosystem, human health and well-being and ...
