Originally posted by PentaxJax Mike.
Can you tell me more about how you use the O-GPS1?
I would like to know how much it extends your exposure time for each shotbefore trailing occurs, and are there any obvious drawbacks from using it. I thing this would be a better purchase for me than a new lens right now.
first off, i am not the biggest fan of the O-GPS1. It is ok but has a few buggy things about it.
The max exposure time depends on several factors such as focal length, global position, direction, etc. At first, i thought i was going to be getting 5 minute exposures (this is advertised as a maximum "best case" exposure time), but at least for my shooting, if i am lucky, I can get 90 sec before trailing is evident. that is still good, but maybe not worth the investment for an occasional star shot.
The obvious limitation is that if you want to include terrestrial objects along with the sky, the sensor is moving, so the ground will become blurred. So you need to take two shots and blend them together. This is part of the deal and fairly easy to do.
I dont use it for any sort of deep sky, galaxy, shooting, etc so i have no idea how it performs in that capacity. I did try to use it with my manual K-mount lenses and was not able to calibrate them due to some bug that exits the calibration function whenever I tilt the camera. what a hassle.
The embedding of GPS data into the EXIF is great and very useful for my purposes. I believe the compass is magnetic because sometimes when I am shooting near spinning turbines, the compass switches back and forth 180 degrees rapidly.
oh and that blue LED is so bright when you are in total darkness and need to put your eye up to the viewfinder. You must cover it with tape or you will be seeing blue spots for the rest of the night, lol. Ask me how i know this.
overall, i dont really recommend it at its current price point. fwiw. it was an impulse buy for me.