
Originally Posted by
Ed Vatza
Al, Axel, Sabyasachi,
Thank you for the your thoughts and comments. I certainly have a lot more overthinking to do!
I have to go back to my one of my original points. If I wanted the lens for just birds, the 500mm would be a no brainer. The 300mm is in the picture because it seems to be more versatile for various other nature photography opportunities.
That said, I know I would be very happy with the 500mm for birds. That was my intention all along. The 300 seems to me to be more versatile as I just said but I am not sure that I would be totally happy. And $4,000 is $4,000. Not a drop in the bucket for me. So if I did tilt entirely in the 300 direction, I would have to be as close to 100% sure as I could.
Which brings me to the math. Al you mentioned 500 vs. 600. Unless I am missing some X-factor, a 100mm increase over a 500mm lens would be 100/500 or 20%. Bare naked, the 500 gives me 67% more reach over the 300 (200/300). But given that I could use a 2x TC with the 300 and just a 1.4x with the 500, the comparison of "maximum reach" of the two lenses is 600mm (for the 300 plus 2x TC) versus 700mm (for the 500 plus 1.4x TC). That is a 16.67% improvement (100/600). Like I said, this is the case unless I am missing some factor in the calculation which is possible.
I really am NOT looking for an argument. I respect your opinions. Besides, can so many great photographers be wrong! :D;) I just have to feel comfortable with my decision whatever it is. And as my wife of nearly 40 years can confirm that I overanalyze everything!