Dew Shield Length

Hi All,

I found some material to make some dew shields for my 100mm (3.93") binoculars. The ID of this material is 4.5". Would an 8" length be okay without interfering with the light path? From what I've read, I think it will be just fine.

Any info or advice would be appreciated.

Thanks,

Eric

Should be OK. Field of view radius can't be more
than a degree or two.