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B-mask with DSLR, issues

Domis

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Domis

Domis

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I'm having a problem that I have not seen any one mention on SGL before. I made a B-mask some time ago which works fine with a SPC900 at prime focus or through the diagonal. I tried to use it while using a Canon 1000d at prime focus with a .5 reducer and BackyardEOS and I could not get diffraction spikes to show at all, just a bright blob of light all the way through the focusing limits. The scope is an old 8" Meade2080 SCT at F/10. Anyone have some thoughts on why the mask won't produce spikes with this configuration?

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