Exactly.... I need more focal length but I do not have the $12,000 it costs to purchase it.
Right now, you have to spend $10,000 to get more resolving power than the 400F5.6, so a better version at $2000 or so will sell.
Oh give me a break..."resolving power"?? Just how much into your image are you cropping? If you're cropping that much you just need more focal length.
Oh, so you're saying a new 400mm f/5.6 is going to be as sharp, or specifically it would have to be sharper than the 500mm f/4 ii or the 600mm f/4 ii? Get real, never going to happen.
What I am saying is that the lenses that fit a Canon which have more resolving power than a 400F5.6 are all $10,000 or more in price.
I need more focal length. I would like an 800F5.6 or a 600F4. I can not afford them.
The 400F5.6 is the highest resolving lens THAT I CAN AFFORD. It costs about $1200 to $1300, about a tenth of what the big whites will set me back. If the new version sells for $2000 or $2500 it is still a lot less than the next lens up....
So you're saying that, since you need more focal length (or "effective" focal length), you're wanting to pair a lens that is even higher in resolution than the current 400mm f/5.6, to a 70D? And you are mainly shooting in bright daylight?
I shoot about half the time in good sunlight and for that I do not need IS, but the rest of the time it would be useful. In poorer light I have to get creative with supporting the lens and feel that IS would help, ( not critical, but would help) but what I am really hoping for is the improved optics that would allow this lens to work even better, particularly with a teleconverter.
There are several lenses that would do the job better (for me) than the 400F5.6....
400F5.6 - $1,525.46
500F4.0 - $10,509.00
400F2.8 - $11,638.96
600F4.0 - $12,983.56
200-400 - $13,220.96
800F5.6 - $14,114.43
This is what it would cost me today to get the various lenses where I live....and as you can see, there is quite the jump going above the 400F5.6 and that is why I would like to see an improved 400F5.6.
I think that a 600F5.6 is out as it would be similar in size and cost to a 300F2.8, which around here sells for $7,880.75 and I would guess that a 500F5.6 would be somewhere around the $4000 range.
Yes, there is a Tamron 150-600 about to come out, but I really doubt it will out-resolve the current 400F5.6.
For me, the 400F5.6 is as good of a resolving lens as I can afford.