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Originally Posted by asimov
Actually I've tried collimating with a contrast booster on, it works to an extent as well. I've often tried with the 3 holed mask but this is the first time I've reduced the aperture so far...no assistant, but I'm pretty quick at getting to the primary screws L.
The only thing that's Ps me off is having to re-align the finder if one has to move the primary a fair ways. This is the 1st time I've seen a airy disc so clear before....Just the ticket for splitting Sirius too I reckon!
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I used a Hartmann mask in Feb 2005 to try and split Sirius, I found what appeared to be a blob (the pup maybe?) sitting just out on the start of one of the diffraction spikes. I showed Astro_south+ this observation when we met up out at Leyburn. I think a hartmann mask is good for this type of use as it seems to tone down the glaring primary. Still I'm not sure or can remember if he was convinced.
regards