3519Re: I've got focus.
- Sep 4, 2011Fernando,
I tried shimming the lens assembly out and got distortion. Admittedly my shimming was on the crude side and may have been the problem. That is why I ended up shimming the focusing ring. Your solution is much better, if you can fix the distortion, as you have a variable throw while mine if fixed.
Please keep us posted.
> This is something I have been giving some thought and doing some work as
> well. While modifying my projector's optics, I have managed to forward
> the optics module for about 2mm within the flange that supports it,
> which provided the possibility to focus at significantly closer ranges:
> From stock, my DLP was able to produce a smallest area of 230x280mm at
> 530mm throw distance.
> After modification I am now able to throw images of
> 135x110mm at 230mm distance
> 200x150mm at 350mm distance
> 230x280mm at 475mm distance
> This gives me a nice range of precisions and sizes to work with and has
> urged me to modify my printer structure to accommodate a rail to support
> the DLP. It's a pretty simple mod and this way I will be able to adjust
> size and resolution to suit my needs. The only caveat here would be
> calibrating dimensions from the 3D model to the print stage.
> NOTE: while fiddling around with the (incredibly filthy) optics to clean
> them up and shorten the throw I have introduced some distortion. I will
> have to carefully tweak around the positioning of the lens module to
> correct it.
> In the meantime, my In-laws have arrived for a vacation and all the DIY
> work is grinding to a halt.........
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