bman212121
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RobAmy wrote:
Not much love for the lens from the above post, I am actually enjoying the lens myself  . The extenders work really well on the 800mm also.
I think the big thing is that seeing the image charts can be a bit off putting if you're even thinking of getting a lens like this. I haven't seen images from the lens yet but I've been curiously watching to see if it's as bad as everyone has made it out to be. So far those charts aren't encouraging, but given the praise I've seen on here from other members for other lenses like the 400 f/4 DO II I'd gladly accept his chart is simply the worst case scenario.
Z250SA wrote:
IIRC, with no guarantee, one of the few issues with Bryans test results is that the tests are shot at minimum focus distance or at least close to. Few lenses are at their strongest at MFD, the long teles perhaps least of all.
He has been the one who _finally_ convinced me to get several lenses. I should, or actually Canon should, pay him a few monetary effects for his thorough work.
But my experiences have not correlated with his in a few cases, especially regarding his test charts. I have found the lenses to be better that his charts appear to indicate. Perhaps because I don´t shoot test charts (brick walls if I´m forced to), perhaps because I usually do not shoot at MFD. But I´m capable of precision work and a ferocious pixel peeper if I feel an urgent need. My RF 100-400 is my latest experience of low corr. His must have been a lemon or otherwise a murky one....Show more →
He as in you asked him or just looking at the site? Just curious because it does seem like he knows quite a few people and he talks to other people I would generally trust their opinion's on. I look at his site simply because others paint him in a positive light and it's quite hard to get actual trustworthy information around such niche products.
It does seem like sometimes the charts tend to be a more worst case scenario, but what I'd really be interested in is if you ever had an experience where his charts were better than what your experience was. I'd think that anyone who was digging for information before making the purchase would be happier that their lens is outperforming their expectations than the other way around. If you end up purchasing the lens despite a more poor showing on the test charts than you'd like it's still a better outcome than getting something you thought was going to be stellar and it doesn't quite live up to hype.
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(100% irony) 
I enjoyed the first day with mine at the zoo. Interestingly after shooting animals I ended up in the garden testing close focusing. It's not everyday one photographs flowers with an 800mm lens. Then again I never follow standard normal uses for any of my lenses. Years ago I used my previously owned FD 800mm to photograph a grasshopper.