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astronomic filters par-focal??


assouptro
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I now own 2 astronomic eos clip in filters

A light pollution one and a hydrogen alpha one.

The question is:

are they par-focal?

will focus remain the same on my modded eos 350 if I swap filters during an imaging session.

If anyone has had experience of swapping clip in filters I would appreciate learning from their experience.

Thanks

Bryan.

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