03-17-2015, 10:17 AM
(This post was last modified: 03-17-2015, 10:58 AM by Brightcolours.)
That is quite a paradox you got there 
.....
You say that Tamron and Sigma have zooms till 600mm that you will prefer over a mirror lens. When pointed at the possibility to add a 1.4x converter to reach 800mm+, you say you want a mirror lens for that because of size and weight. But that situation is exactly the same (minus the small weight and size of 1.4x TC) at 500mm....
No idea what you should look at, frankly. The only one I can think of is the MTO 1000mm f10, and that lens weights 2 kilos. Focus peaking won't be of much use at those focal lengths btw, not accurate enoughand you will have to judge by eye.
.....You say that Tamron and Sigma have zooms till 600mm that you will prefer over a mirror lens. When pointed at the possibility to add a 1.4x converter to reach 800mm+, you say you want a mirror lens for that because of size and weight. But that situation is exactly the same (minus the small weight and size of 1.4x TC) at 500mm....
No idea what you should look at, frankly. The only one I can think of is the MTO 1000mm f10, and that lens weights 2 kilos. Focus peaking won't be of much use at those focal lengths btw, not accurate enoughand you will have to judge by eye.