Archiv September 2009

Polarisation of a LCD display

Monday, 14.09.2009

Foto with polarisation filter

Foto with polarisation filter


Foto of a LCD display using a polarisation filter. By putting a transparent paper on top of the screen, the polarisation is broken and the display can be seen. Parts without transparent paper are dark due to the polarisation filter.

Luminescence of envelopes

Sunday, 13.09.2009
Opening of an envelope with liminescence

Opening of an envelope with liminescence

The splice of an envelope is lightning due to luminescence. The foto was exposed 0.1s and the envelope was lying at the table during the other site of the splice beeing moved up.

The moon, always a nice foto

Monday, 7.09.2009

The moon fotographed with a 300mm lense

The moon fotographed with a 300mm lense


A simple 300mm lense is enough to see a log of details of the moon at a distance of more than 300000km.

How fast is a rain drop falling?

Saturday, 5.09.2009

How fast is a rain drop falling?

How fast is a rain drop falling?


The foto was exposed with 1/500s. The hight of the foto is about 20cm. This means that the velocity is about 25m/s. The rule: velocity in m/s is 6 times the diameter in mm seems to fit.