sample 45
concrete brick #1

12:57pm just when I wanted to start setting the aperture
the lamp stopped burning, looks like a normal end of its life.

Put in the other lamp of this type that we have left. That one 
is no good, the grey-outside mirror-inside layer starts to show 
holes immediately. After fifteen minutes this lamp stops 
burning as well.

No lamps left, so looking for another lamp. I found the lamp 
holder with a halogen lamp and parabolic mirror mounted behind 
it, this one seems to work fine. I noticed the lamp in the 
other setup (the one I used last year) has also such a lamp. 
After a few hours of trying I have a new lamp ready. The beam 
is very homogeneous when measured with the spotmeter on the 
grey card: 10.0 all over the place and an occasional 9.9. 
By eye it also looks very good. But on the TV monitor and 
in the captured images you can find some regions (a bit like 
rings) that are a bit brighter. However, this was also the case 
with the previous lamp. All in all I think this lamp is even 
better than the previous one. It is certainly more 
stable: it's a normal halogen lamp that lasts a long time. And 
it is as parallel as I could get it. Hard to say how much since at 
larger distances the edges of the beam get blurred and colored 
so its hard to measure the diameter as a function of the 
distance. Depending on how you measure the diameter of the beam 
it diverges a few centimeter over 5 meter.

voltage of lamp 12.00V

This took me four hours. Now back to work.

I notice that i have to adjust the white balance: 
r=-8, b=-50

aperture: 1 tick below 8
zoom: maximum, this is the first of the 3 small strip bricks. I 
put tape above to be able to center it horizontally (you can 
see this in the images).
parameters: z=330 (Changed with new lamp)
            p=21 
            l=176

again the sample does seem to be a tiny bit pointing down. But 
i calibrated it this morning, maybe this is because this is a 
heavier sample

photometer calibration: upper grid line is not on the sample, 
measurements were made but can be ignored

6:43 pm finished
now doing calibration in 960216