Question is from what bottom point to what top point are all these new red dot optic standards? Ie for 1.42" 1.57", 1.73", 1.93", 2.04", 2.26" mounts, what is that measurement exactly?
Is it from the top flat of the Picatinny rail? The bottom flat? the bottom flat of the mount that interfaces w/ the top flat of the pic rail, something else?
Is that to a notional point above the mount that would correspond to the centerline of an Aimpoint T2? the top of the riser? Something else?
I'm trying to make a cheat sheet (for purposes of inputting height over bore into ballistic calculators), and I can't find any info actually giving the spec of these things. I know that old school it was a " 1" riser and a .83" riser " that got you to "lower 1/3 co-witness" (~2.8" above bore) and "absolute co-witness" (~2.6" above bore) when using an M68, but those were 30mm tubes and there wasn't a whole lot of variety back then. With the new convention that has popped up over the last few years, a 1.42" yields absolute and a 1.57" yields lower 1/3 co-witness, but is that only with a T2 form factor? If I understood exactly how it was measured it would be easy to convert, but that info doesn't seem to be listed anywhere. Thanks for any responses.
Is it from the top flat of the Picatinny rail? The bottom flat? the bottom flat of the mount that interfaces w/ the top flat of the pic rail, something else?
Is that to a notional point above the mount that would correspond to the centerline of an Aimpoint T2? the top of the riser? Something else?
I'm trying to make a cheat sheet (for purposes of inputting height over bore into ballistic calculators), and I can't find any info actually giving the spec of these things. I know that old school it was a " 1" riser and a .83" riser " that got you to "lower 1/3 co-witness" (~2.8" above bore) and "absolute co-witness" (~2.6" above bore) when using an M68, but those were 30mm tubes and there wasn't a whole lot of variety back then. With the new convention that has popped up over the last few years, a 1.42" yields absolute and a 1.57" yields lower 1/3 co-witness, but is that only with a T2 form factor? If I understood exactly how it was measured it would be easy to convert, but that info doesn't seem to be listed anywhere. Thanks for any responses.