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would be good to let us know what filter wheel? The Sigma has a backspace of 44mm (more like 44.1mm but anyway).
Your camera takes up 6.5mm. That means your adapter and filter wheel need to be 37.5mm. Your "short adapter" is 17.5mm, so you've got 20mm to play with for your filter wheel and any spacers. What filter wheel do you own?
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