Hi Brendan,
Thanks, I am toying with the idea of upgrading the peltier to a larger wattage one to see if the drop increases, they are quite hungry though, the 48W one runs at 4A and the next two choices are 6A and 8Amp modules
. The PSU I have is rated at 7.5A, so I might be pushing it.
The M42 pic I took the other night was achieved with the camera sensor solid at 4 degrees C and this provided VERY little noise on the subs and a smooth pic as a result....
I will give the box a go on some more DSO's and see how it performs at different ambients outside with the camera running hot.
Cheers
Chris