Originally posted by clackers You can't go out birding or shooting field sports with just an 85mm lens, Paolo!
It's short, and inflexible.
A 70-200 like the Pentax D FA is standard issue for that length.
In my original post, my point was not limited to the 85mm. More a general one...
Though the availability of a fast (read: large max aperture AND non-screwdriver AF) 85mm could be quite useful for other kind of situations.
In sports/wildlife photography it's almost of no use (almost...).
Specifically about the 85mm, I reported my personal experience trying to take portraits of a fast moving singer.
The example makes sense, because a large aperture allows to blur any disturbing background, the required focal is often around 85/100mm (if you are close to the stage), and a fast AF camera + lens combo must give correct framing (no delay) AND correctly focus the chosen subject (usually the closest eye).
So a fast AF, with reliable tracking, can be very useful in event/concert photography, unless the subject is quite static.
IMHO, considering the current situation of the market, the availability of a "sport oriented" FF camera would positively affect the sales of fast AF primes.
It doesn't take a crystal ball.
The number of people who would invest in such lenses is already limited.
Those who are fine with MF primes (like me) are for the most part already happy with what they own (or what's available second-hand).
Potential buyers either own a FA*/Sigma, or wait at the window. Both could be lured by the availability of the kind of FF camera i'm referring to.
If i had enough dough to invest in a fast 85mm with AF, both the FA* and the old Sigma would be more than fine, considering the AF hardware of my K-1. Personal opinion, of course.
To make my point clear, let's see who could actually be interested in a fast 85mm:
1) You want/need AF, but reliable tracking, big buffer and very fast AF aren't so important: there are already two choices in the second hand market
2) You absolutely need it (and want a Pentax!): the purchase of the new primes will likely wait till the new "sport" FF
3) You are fine with MF: probably you already have it, or you can easily find one; i don't know how many people would spend such good money, just for the sake of AF (btw, many have already invested in a prosumer zoom)
I belong to No.3, as a good number of forum users. I already have an A*, a Samyang, an Auto Takumar f/1.8, a leitaxed Summicron 2/90mm...
I thought to be a little too fetish with vintage lenses, but now i understand i'm not the only one. I'm relieved
To hook me with the new prime Pentax needs to offer a lens/camera combo that would lure me into shooting a kind of photography i'm actually not very interested in... at least with my current outfit... but if i were given the chance to do it, in a fast, easy, reliable way... who knows
Got it? It's basic marketing
cheers
Paolo