Originally Posted by
TheAnimus
K-5 still, so a crop body.
I'm confused by your usually goes?
For instance Olympus have a rell regarded 75mm! The thing is, I don't get why you'd expect there to be a conformity remember Canon make a smaller crop sensor, their idea of APC-S is smaller than other peoples (which is funny considering the zmofg you must have FF, bregade who use them). This means, crudely speaking, that a Canon 85mm, will give the same frame that a Pentax 91mm would (which doesn't exist iirc.).
The Pentax 77mm is a great lens, funnily enough nothing is available that competes for canon, it is much better than the cheaper 85mm 1.8, you either have to spend twice the amount on their 85mm f1.2 which has none of the vingetting that plagues the 77mm (that said it iseasily fixed in photoshop), but the 77mm still smokes it in turns of CA, which I find harder to fix. If you look in one of my Tet series, you can guess which one I had the 1.4 teleconverter on the 77mm shooting at 3.5 had quite bad CA creap in none the less. However of course the 1.2 allows for mad DoF, personally I'm not sure you'd need such wide appature unless your FF. So I guess I'm saying don't compare the 77mm to anything in your system, its not actually ment to compete. Funnily enough they offer a 70mm which is ment to compete with the 85mm.
So all lenses have pros and cons, environments when they shine, when you can hide their flaws or even embrace them. To think that a lens should be ending in a certain number is a bit silly really, the lens should be a compromise of what can be engineered in to what package, ultimately, at what price! I think its kind of unfair that the manafacturers haven't gotten together and agreed a standard mount, obviously its not remotely in their interest but would be great for us.