Originally posted by UncleVanya I'm not following your point about the number of contacts and autofocus. The contacts on the back are for auto-aperture and lens communication but the autofocus requires a couple of additional things. Namely a screw drive shaft and/or the PowerZoom/SDM contacts. So a Pentax SMC A 1.4x Converter won't provide Autofocus, but an HD DA 1.4x will for example.
https://www.ephotozine.com/articles/pentax-hd-pentax-da-af-1-4x-aw-rear-conv...1402652272.jpg
The seven contacts only provide the data pin, the max aperture, and the "auto" aperture selection (on or off by way of retracting or pushing it in contact). The two gold pins inside the mount to the top are the SDM/PowerZoom contacts. The slotted item to the top above the gold pins is the screw drive slot. Not sure if you knew all this already just trying to clarify what you meant.
well if there are only 6 it won't auto focus number 3 or 4 might be missing but I buy my stuff on ebay so I am looking at images to assertain the features and it took a while to work out the 7th contact is the AF thats all.
---------- Post added 02-13-18 at 07:17 PM ----------
Originally posted by mikesbike Your auto ISO range is only for being in modes where the camera will set the ISO automatically. But you can simply set whatever ISO you desire when being in other modes by hitting the ISO button. If you hit the info button twice, the quick links for adjustments will come up, including the auto ISO range. I have my K-5 and K-5 IIs set for a range of 100-3200. But by hitting the ISO button on top, I can set ISO 6400, or 8,000 or 10,000 if I would care to. It will then be and stay in that manual setting until you change modes to an auto mode which requires the camera to set ISO automatically.
As to underexposures, the K-5 series cameras tend to underexpose by about 1/3 EV by my estimation. Better than their predecessors the K-200D and K-20D, which would underexpose by 1/2 to 3/4 EV. Just how this will impact the actual result is matter of the lighting and metering in a particular circumstance. I just took a shot of my indoor scene, in a room having a very large picture window on the left wall, no sunlight coming directly in, but a very bright afternoon. Some light, but mostly darker furniture. No artificial lighting. ISO is 1600. The matrix meter did a good job. In P mode, "0" exposure comp set, the window, which took up about 1/3 of the frame on the extreme left to middle, using the DA 21mm Limited lens, is a white-out, while the rest of the room is perfectly exposed. If I had people in the room, this would be ideal, without my having to fiddle around. So the meter produced a good balance between the extreme bright area and the darker areas, tending to overexpose the bright while opening up the rest of the scene just right. But for most more evenly lit scenes, I may very well have exposure comp set at +1/3 EV.
You can go to the Custom Functions menu (C menus) and set EV steps to 1/3 if not already so. In the same menu, you can set ISO sensitivity steps to be likewise as EV steps.
The K-5 series are excellent cameras. I don't know what you've found you like better about the K-5 over the K-5 II, since the II offers faster, more accurate AF with some lenses. I added the K-5 IIs since it eliminated the AA filter, which has resulted in sharper fine detail. Be sure also to set F for Fine Sharpening in your Custom Image menu.
Thank you for the F tip I have found my cameras to be spot on with the exposure =/- settings however using a zoom lens on AV mode when I zoom in I am loosing some light so I may need to close the aperture a little to see if that corrects the problem. I am using the full 80-51,000 ISO range and I like it but I set it manually. I will have a look which modes utilize the lot possibly green mode.
Also the Tawny Frogmouth is sitting on the shaded side of the tree being the reason its a little darker than you would expect.