Ok I've googled and got nothing saying if butler creek or anybody els has caps to fit the SHV F1 model. Anybody here know what size eye piece etc will work for it?
^^^This if you're will to spend the money. If not, the Vortex Defender caps have been working very well for me. I have them on three different scopes, only one of which is a vortex.
The semi-universal Monstrum Tacticals my friend has are blatant copies of the Defenders at 1/2 the price and seem pretty good the few times I've flipped 'em. All you have to do it measure the diameter of your ocular and objective bells to know which size to use.