Circumpolar star trails

[KmH]

D90
18mm
f/11
ISO 200
15 minutes
After all these years only my second attempt at photographing star trails. 1st time with digital. It's had a pass through the noise software.
The one point star there in the upper left quad is Polaris the north star and all the other stars appear to revolve around it. Not the best location for this attempt.

 

[Josh66]

Nice.

The last time I tried this was with 25 ISO film, all night exposure - I got nothing, underexposed...

 

[KmH]

All night.

Underexposure? Or reciprocity failure?

And thanks for the comment.

 

[Josh66]

All night.

Underexposure? Or reciprocity failure?

And thanks for the comment.

Not sure if it was reciprocity failure or not (maybe it was).

Not "all night", but 4 or 5 hours. I thought that would be long enough.

I'll try again with faster film...

I don't remember what aperture I was using, but I could have been stopped down too much too.