sv605 ir cut

Svbony 605cc doesn't have a uv-ir cut filter so...

cc and ff spacings therefore need an extra 1mm sensor distancing from the body of the optics.

e.g. with the q150

1. without filter:
17.5 + 30 + 6 = 53.5mm

2. with filter
17.5 + 30 + 7 = 54.5mm

Most easily achieved using the final m48 to m42 step down adapter, 6mm or 7mm.

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EDIT:
It's you-get-what-you-pay-for rubbish! OK, alongside a veTEC that is. Compare with e.g. the images here.

cluster melotte 15 and associated nebulosity the heart in cassiopeia
sv605cc on 72ed    54x4minutes @ g100 o10