Re: Sony FE 100-400/4.5-5.6 GM vs Contax 100-300/4.5-5.6
I had tried to obtain a good copy of this lens last year but unfortunately, the one I bought off ebay had balsam separation and I had to return it. Then I gave up on it and purchased the Sony 70-200 F4 but after using it for a while, I just wasn't happy with the rendering. So recently, I took a gamble and bought two copies of this lens off ebay expecting that I would have to return at least one if not both! Well, the first lens just arrived (serial 7506159) in the original packaging and its perfect! I just shot some charts and compared it to my Sony 70-200 F4 and it totally demolished it in the 100-200mm range at F4.5 (ok they were close at 135mm), at F8 they were close throughout the range but the Zeiss still had the edge. I tested the VS at in the 200-300 focal range and it wasn't quite as strong but still very good. After a bit of sharpening, it was basically as good as in the 100-200mm range. There was also some chromatic aberration in the 200-300 range which can be removed in light room with one click. I'll do some real world comparisons tomorrow but I'm pretty happy that I finally got a good copy of this lens! Now the second copy I ordered will arrive next week so lets see how that one compares . I'll probably have to return it or sell it . Can I ask people that shoot with this lens whether there is any focus shift? Is it ok if I focus at f4.5-5.6 and then stop down?
Jul 05, 2019 at 06:30 AM
Previous versions of Robin Kalfat's message #14901023 « Sony FE 100-400/4.5-5.6 GM vs Contax 100-300/4.5-5.6 »
. I'll probably have to return it or sell it 
. Can I ask people that shoot with this lens whether there is any focus shift? Is it ok if I focus at f4.5-5.6 and then stop down?