I'm neither a Sony, nor canon shooter, but I shoot a Pentax K-1 with various lenses and telescopes, including the Pentax 70-200 f/2.8, Pentax 300mm F/4, Pentax 150-450 f/5,6 -6.3, and WO Whitecat (Redcat series). From my experience, the Redcat is best. This is one of the nicest feeling lenses from Canon yet. It comes with a lens hood which continues with the new textured style we have seen on the 100mm f2.8 IS Macro and the 70-200 f2.8 L IS II and it also comes with the usual lens pouch. Noticeable in it’s absence though is a tripod collar and frankly I think this is unforgivable.
The autofocus reliability alone is worth the extra price. Find a refurbished 70-200 IS USM II and it can be had around $1500. You won't regret it, I promise. It's my most used lens. The image quality is impeccable, it's built like a tank, rarely misses focus, and the bokeh is to die for.
I recently got the 2.8 this week and I already had the f4. I don't think your going to notice sharpness difference without pixel peeping. The f4 was already similar in size to my 70-200 2.8 GM. The 2.8 is just huge, I grabbed it at a good deal otherwise I would not have gotten it for my uses.
70-200mm F4 zoom lenses may not get as much attention as their faster F2.8 siblings, but for many photographers these lenses hit the perfect sweet spot of price, performance, and weight. This week, we shoot the new Tamron 70-210mm F4 alongside the equivalent Canon and Nikon models to see how they stack up.
The Pentax FA* 80-200mm F2.8. Let's not forget Pentax's previous fast full-frame zoom. This film-era autofocus lens was produced from 1994 to 2004 ( view specifications in our database) but still commands fairly high prices second-hand. We compared this lens to the D FA* 70-200mm and immediately observed that superiority of the newer optical
