Shouldn't need a clarifier with a 2x lens. You may want to check what they run for classes and the rules. A lot of places a lens in the scope puts you into an Open class. There is a place I've gone to in the past that has a MBR-O (Bowhunter release optics) that allows you to use a lens and/or movable sight, but limits the stab. 2x isn't much, and if you want to shoot bowhunter class it wouldn't be worth trying to use (or spending money on).
Depends on your eyes and how they focus. I find I'm starting to need a clarifier when I use my 6x lens and sometimes 4x. If the target looks too fuzzy to you and you dont mind a bit of pin fuzziness, use a clarifier.
I shoot a HHA OL-5019 with a 4x lens. Outdoors the scope is a pain if the sun is in your face... it washes out the entire scope. I haven't shot 3D with it yet though.
My only complaint is I should have went with a .10 pin (OL-5010 model) because with the magnification a smaller pin could help with placement better up close. Within 20 yards 4x is almost too much magnification but I can tolerate it. I can't even imagine people with 8x lenses.
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