Hi Paul,
One of the reasons for 10" aperture is that my machinery is limiting me to that size. A larger one would require outsourcing parts, with all sorts of quality control and cost issues.
Also I think that there is a bit of a gap in the market at the moment for portable 10" astrographs.
This one travels nicely on the back seat with room left for an Esky.
So, I'm afraid I can't commit myself to designing a larger one at this stage, but who knows what the future will bring.
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