Let us look at the lenses suitable for the K-1, because there are quite a few:
Zoom lenses introduced 2015/2016 for FF:
-D FA 15-30/2,8 ED SDM WR
-D FA 24-70/2,8 ED SDM WR
-D FA 28-105/3,5-5,6
ED DC WR
-D FA* 70-200/2,8 ED DC AW
-D FA 150-450/4,5-5,6 ED DC AW
These are high quality lenses and cover the range between 15 - 450 mm. So, nothing is really missing here.
What has been criticized while waiting for the camera, has been
the ralatively few D FA primes available. And that is correct if one speaks of new lenses. But when including the FA lenses and the DA lenses that will work with FF, that critic looses some punch. First the D FA lenses:
-D FA 50/2,8 Macro
-D FA 100/2,8
-D FA 100/2,8 WR Macro
Then the FAs:
-FA 20/2,8, FA* 24/2, FA 28/2,8, FA Ltd 31/1,8, FA 35/2, FA Ltd 43/1,9, FA 50/1,4, FA Ltd 77/1,8,
FA* 85/1,4, FA 100/2,8, FA 135/2,8, FA* 200/2,8, FA* 300/2,8, FA* 300/4,5, FA* 400/5,6, FA*
600/4, FA 600/5,6.
That makes at least 20 FF primes. I haven't even mentioned all. Are we lacking any primes?
All these lenses are superbe, with the * and Ltd series as leading stars. Some were produced from 1991 till 2004 for
the Z and MZ cameras, some came later and are still produced. But will they do the job for a demanding FF camera? The Ltds will, according to tests. In fact, each of these 17 FA lenses scores very high (between 8,67 and 10,00 out of 10) on Pentax Forum user
tests with digital cameras. The only feature missing here is the Weather Resistance.
For that purpose, we have some DA prime lenses that are officially FF ready. Those are:
- DA* 200 2,8 and DA* 300 4, DA 560 5,6.
there are at least 23 Pentax FF primes available. In addition, Pentax has a lens roadmap promising more primes to come from early 2017.
So, the list of superbe lenses is long. Probably longer than that of most other brands! According to Ricoh/Pentax,
there are 215 K-mount lenses to choose from..
There is no reason to wait. Go out and shoot!
I have also presented images taken with some popular DA zoom lenses, to show where they can work, and where not. Please see DA lenses on K-1
From looking at those test shots, I would recommend the following as a good mix if you do not have the D AF lenses:
-DA 16-45/4, covering 20-45. Very sharp
-DA* 50-135/2,8, covering 70-200. Superbe quality from 5,6, even on heavy enlargements!
-DA* 200 or DA* 300, or FA* 300. (Or K 200/4 from 1975!!)