The seemingly ideal binocular reflex viewer appears too bulky and downright expensive,the Toyo monocular single-sighted viewers are not vertically corrected. Have I seen a Cambo reflex monocular viewer somewhere? Cannot find. Has anyone information on it or any other similar functioning viewer? (Oh, yeah, I have a Toyo 45AX, shoot primarily 135-300mm lenses). Though I have been using the BTZS Focus Cloth, still prefer seeing and framing the world RIGHT side up on my feet, not upside down on my head, even if it is with only o