I'm an amateur timelapse photographer who recently came across the Teletrack/Merlin mount. Among timelapse photographers the most used mount currently is the Meade DS series mount because it is similarly low priced, custom speeds can be set directly from the hand controller for those who want it simple (e.g. choose a speed, clamp down a button and off it goes), and for those who want advanced control there's an extensive RS232 command set published. But the Teletrack has integrated camera control which opens up new possibilities. Also, the Meade mounts have an awkward unbalanced shape, inconvenient for trying to mount it on a flat surface or just for packing, and they are noisy. From what I've seen/heard the Merlin head is so quiet that it can be used as a video panning head as well which is a really nice bonus. In other words, this mount has the potential to become the best timelapse mount for the price out there, so I am very interested in the progress of your work and contributing if I can.
To see what an ideal interface looks like, check out the video on this site (you can skip the first 10 minutes which is mostly hardware setup):http://www.camblock.com/sect-support.php
This is definitely more than I expect can be done here, but it may be within reach implementing some of this functionality. The key elements are:
Slew mount to different positions, add these as keyframes on a timeline
Allow ease in/ease out of movement around keyframes
Allow for preview of the trajectory (fast panning speed, no photos)
A couple of things the timelapse photographer needs to think about when setting up a shot:
1) The interval between photos has to be appropriate given the focal length and maximum panning speed. If the interval is too long, the scene will move too much from one frame to the next and the footage won't look smooth.
2) The exposure time itself cannot be too long or the panning of the mount can introduce motion blur. This again depends on the focal length and max panning speed.
If the user can enter the lens focal length used and the focal length multiplier for the camera, advice can be given as to what the minimum shutter speed and maximum interval between frames should be to give sharp/smooth footage once a trajectory has been set and the max panning speed is known. This only needs to be approximate and would be quite helpful reminders to avoid messing up a shot. If this is something you could implement, I could work out the numbers/formulas.
Did you find out whether triggering the camera without interrupting slewing is possible?
BTW, I'm confused about an earlier post:
If someone find some usefull informations about these protocols, please share! There are maybe some guys who hacked them using a USB sniffer...
Which protocols are you referring to? I would point to gPhoto, but I see you are already on the gPhoto mailing lists. From what I've read there, gPhoto can set exposure bias on some cameras.