There you go Fox. Listen to the Man (John B) carefully! He knows what he is talking about!
btw. re the 2" vs 1.25" question. You need the 2" barrel once the focal length exceeds 24mm to accommodate the full FOV. It's just a matter of geometry:
With a fixed 68-degree FOV, you are effectively fitting a particular shaped triangle into a rectangular box. Past the 24mm focal length the triangle gets too big for the 1.25" box. For the 27mm you would need a 1.4" box but the next standard size up is 2". So the 27mm must have a 2" barrel while the 24mm can make do with 1.25". That is all. So 2" does not at all "mean brighter and 'better' images/performance". I hope that makes sense.
