I built a flatbed guide to align the towers yesterday, and set a 3mm piece of MDF in the centre to accommodate the uneven wood bottom, to make the L-plates the main support.
The towers were laid along the line and the L-plates glued to their sides in exactly the right place. Once the glue had set, after 10-mins, these were drilled and screwed firmly. Today, testing. The existing rivnuts on the bases generally fit, some better than others, but enough that I didn't have to make adjustments, all good. The towers are now very accurate in height and verticality. For towers 1175mm tall, they're so close that any tiny movements due to stepping nearby or touching them is bigger than the difference between them. Without a new room with a flat concrete floor, this is as good as I can get.
Then, setting up and testing the camera alignment. Cheeseplates were again fitted, first using one loose screw as a pivot, the camera set between them on the steel rods. The screw was gradually tightened as the alignment got better, then the tilt checked with a spirit level, and the screw moved to tilt the plate just fractionally. Eventually things were set correctly. The final calibration was on the main camera shoe, the step I'd neglected yesterday. After this, all was set. The cheeseplates were fixed down with hot-melt glue, and when it was set, screwed to lock them in the exact place. A final test of the resolution and alignment:
This gives a resolution of 331.845dpi, to the 1.25mm thick ruler. The resolution will be higher for thicker objects (paintings on 3mm or 6mm board, or 10 to 20mm deep for canvas). This is good. Not too high, as the image files would be too large. I'd aimed for 300dpi plus 10%.
The project has cost me £94.12 in new buys, £146.74 if I include the Smallrig parts (some I had previously bought), and more still if I include the many rivnuts and the few bolts needed. This is double what I'd anticipated, and it's taken 4.5 days, longer than hoped, but this should speed up and simplify my art photography, particularly for larger works. One reason I'd avoided painting larger is that it was hellishly difficult and stressful to photograph them. I'm amazed that the old flimsy tripods ever managed to take an accurate multi-part photo of my paintings. Perhaps they rarely did, it's just that such inaccuracy is tolerable for most people.
So, this improved rig is a necessary step forwards for my art. One of my tenets is that any short-term effort to improve things by 1% is worth it. Spending £100 or £500 to improve your art by 1% is worth it. Over time those 1% values will add up, pushing you beyond those artists who didn't invest in those 1% improvements. The tortoise betters the hare, ugly ducklings become swans drip by tiny drip.











