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Loren E wrote:
Cool thanks for the info folks. I thought since the Canon 135 F2 is pretty small, affordable, and only 72mm front threads, that it could be possible, but it sounds like I was underestimating the difference between F2 and F4.
According to the patent Nikon filed a couple years ago, the next Nikon 135mm VR will be f/1.8 with generous use of the SuperED glass element, which is only used so far on 200/2 VR Nikkor. You can guess how much it will cost.
My personal specific interest would be for shooting concerts with it, as in these low light situations I find F2.8 to really struggle and often times getting close enough for a tight shot with an 85mm isn't possible.
You can always shoot higher ISO, such as ISO 25600, with f2 or f2.8 glass.