We are agreed all around then!I agree with your position if you are simply showing a clinical evaluation of a lens, but there is also the option of showing what is possible with that same lens and that is where our approaches differ. This is particularly true with mirrors, since the central obstruction inherently reduces contrast pretty dramatically, so any kind of natural-looking image requires a contrast boost in post at the very least.
In this case I was curious as to whether the apparently really good ones, within the limits of a modern-ish Canon camera and its tricks only, gave a better foundation than what the cheap Samyang crowd was providing. If marginal, then I'd stay thrilled with my stupidly low prices and enjoy the toys for what they are. If substantially better then I might look at various markets.
I find in perfect conditions both the Opteka (Samyang) 500 and 900 can produce solid work with post-processing. The big trick was coming to terms with the ideal temperatures, and once I figured that part out the keepers became very consistent when situationally permitted. Regardless, the starting point is low contrast and softness. That bird photo, for example, should have a DoF of ~ .42 meters at 15 meters distant, and since the bird is less than 4 centimeters thick then unless my focus is crazy off (it wasn't, there was peaking) that's pretty much well what I get for the 500. Can I make that picture better? Yes! But that's my copy of the lens on a bright day in a slight breeze and hand-held by me. A person can look at that photo and go, ah — with an R6 and a 500mm Samyang that's a realistic expectation regardless of post skills.
But the act is inconvenient and the ideal situations are rare enough that I have far more useful lenses from Canon and other brands to cover the same range for "real" work. Still, I'm an engineering nerd and enjoy the side exercise all the same.
So yeah, enhanced or not I do enjoy seeing photos such as yours. But I find the in-camera edit restrictions more informative.
(Also, the 500 is a good astro lens for tracking stuff like the Andromeda galaxy when picture stacking is used.)
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