The email issued mentioned earlier this week is now fixed! You may also have received previous emails that were meant to be sent over the last few days - apologies, this was a one time issue and shouldn't happen again!
Does anyone here know where to get these?
The cover is adjusted by twisting it.
BSA uses these on their scope and they look like a good idea.
One can limit the light coming from the corners and thus increase depth of field. Also works against heavy snow/rain better.
Fully closed they stop...