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OK, the new lenses are announced, and they really are GMaster, and they really are under 1kg (without the foot, but that's fair, given the weight).
I was surprised - I was expecting these lens to arrive with a G designation, rather than GM - I thought the GM would be saved for the 400/2.8 and 600/4. These lenses do lack two things: no drop-in filter, and no aperture ring.
Although a number of reviewers have recommended the 400mm f/4.5, I don't think I'll be buying that one - I lashed out and bought the 100-400mm f/4.5, and I have no regrets. Yes, it's double the weight of the 400mm f/4.5, but it's a heck of a lot more flexible with the 100-400m zoom. I've been using it for a while and I've been very grateful for that zoom. I'm certain Sony released the 100-400 f/4.5 first precisely so I would do as I did

The 600mm f/6.3, though, that's tempting. I'm going to hold off for a while (mainly because I blew my hobby budget to bits getting the A7R6 and the 100-400!!), but I think I will have trouble resisting - we'll see.
What's your reaction to these two new lenses?
More than anything else, I think Sony have guaranteed that I'm never going to buy the 400/2.8 or 600/4 - they are just too heavy for my aging physique, and now there are options that appeal far more. (I won't deny that the price difference is important, too!)
I was surprised - I was expecting these lens to arrive with a G designation, rather than GM - I thought the GM would be saved for the 400/2.8 and 600/4. These lenses do lack two things: no drop-in filter, and no aperture ring.
Although a number of reviewers have recommended the 400mm f/4.5, I don't think I'll be buying that one - I lashed out and bought the 100-400mm f/4.5, and I have no regrets. Yes, it's double the weight of the 400mm f/4.5, but it's a heck of a lot more flexible with the 100-400m zoom. I've been using it for a while and I've been very grateful for that zoom. I'm certain Sony released the 100-400 f/4.5 first precisely so I would do as I did
The 600mm f/6.3, though, that's tempting. I'm going to hold off for a while (mainly because I blew my hobby budget to bits getting the A7R6 and the 100-400!!), but I think I will have trouble resisting - we'll see.
What's your reaction to these two new lenses?
More than anything else, I think Sony have guaranteed that I'm never going to buy the 400/2.8 or 600/4 - they are just too heavy for my aging physique, and now there are options that appeal far more. (I won't deny that the price difference is important, too!)