250-278.cor (13.8 KB)
Here is the .gcor file they generated for me. I changed the type to .cor so it can be uploaded.
This is link to their newest software.
The results was done in the ComMarker Studio and not Lightburn because when loaded the calibration file into Lightburn, there was no effect at all.
That correction file is for 250x250mm lens with the focal length of 278mm
Strange, it does seem like the file is in hardware lookup table, but they have calibrated with a 17x17 grid, is that too much?
I can load this .cor file in LightBurn without any issues.
That would be odd.
This means their new “multi-point correction” is not very accurate.
Ok, I lied about the no effect. When I first drew a 200 square with the calibration file loaded in Lightburn, it was much larger than expected in the preview so I didn’t follow through with the test grid.
I have scaled the whole test grid down to 191 and here is the result.
It is not a bad square, but the non-linear distortion is still present.
250-274.txt (13.8 KB)
I recently went through the same problem with ComMarker tech support. With the 250mm lens my focal distance was 275mm. Attached is the gcor file they sent me, disguised as a txt. They sent a video that showed how to install it. They also sent that same version of ComMarker Studio. It has field settings for a 17x17 point test. I’m sure I can get more accurate values by measuring the XY coordinates of all 289 points, but their files is good enough for me.
They also sent a short calibration import video. It showed that they had a bunch of calibration files on hand for every even number focal distance. Instructions were: Set lens to B, open Device Setting: Field. Set Correction Way to Marking multi-point correction. Open Multi-point calibration, Import, select the gcor file, and confirm.
It vastly improved my squares in ComMarker Studio, and I was able to import the calibration file into Lightburn as a cor file, but my squares in Lightburn were still all messed up.
Lightburn isn’t working and ComMarker Studio is missing all but the most basic graphics commands, so I’ve been doing all my editing in Inkscape. It’s not bad, it’s a learning curve, but I definitely look forward to Lightburn support for this weird lens.
I forgot to mention, I had some mechanical problems aligning the laser to the screw holes. I put screws in the holes then held a piece of paper against them. I drew a line in ComMarker Studio, hit preview, and moved it up until it was on the edge of the paper. It was like 1/8" off on one side. I rotated the base and the laser as far as they would go and it still wouldn’t align. The piece that the laser mounted directly to had chunks of metal sticking out far enough that the screws were at their limit, I couldn’t rotate the part. I machined off about .030" from both sides (see the shiny bare aluminum tabs in the picture) and that gave me the room I needed to get the laser properly aligned.
Have there been any updates on when LB might have the 25 point calibration ready?
Not at this time - I checked our internal tracker system and it hasn’t been touched lately.
The Omni X uses a custom control board which means the BSLapp can not detect it so I can’t even use the calibration tool on that… please Lightburn you are my only hope… This very expansive machine has less than 20 hours of use in the last 6months due to the nonlinear scaling problem…
