[shyrsio]

One more question-does the crop mode give you the 1.5 factor for the PLM?

Here's a little trick, try using the square crop on the DA lenses, in many it will crop away the vignette and the crop factor will be smaller.

[Wheatridger]

I have neither camera, but why not use the camera comparison tool? Offhand I would say the big advantage is the moveable screen, better autofocus, other improvements with newer technology, but on the other hand it's heavier and can take less shots per second. Using the camera comparison you can go though and rate what is important to YOU. Of course you can also use legacy lenses at full frame.

I don't recall the precise FPS, but the K-1 roughly doubles in shooting speed when you crop to APS-C. And you gain a wider field of view outside the frame, which can be helpful for sports, etc.

[Eoghan]

Ive found the Dfa 28-105 to be a great lens , if you Buy it as a kit it will not disappoint, Like most Pentaxians i have Aquired some old FF primes and Zooms 28mm fa 50 , f 35-70, and my DA 70 and DAL 35mm FA 100-300mm. These zooms may not be the sharpest lenses around but they are relatively cheap ,easily found and work well on the full frame , Ive used crop mode rarely but find the Square Crop more pleasing to my eye. I intend on saving some money and buying some more DFA lenses as i go meanwhile I'm enjoying my K1

[Paul the Sunman]

The DA 55-300 is OK in 1:1 mode, which is bigger than APS-C crop mode.

[henrikpedersen33]

Really considering the K1ii with 28-105 kit from B & H. All my lenses are are APS-C & if I buy this kit I can’t buy any FF lenses for a while. Am I gaining anything? Currently using K3-ii

I have a K-S2 with some DA lenses and I have the K-1ii with the 28-105 and some other FF-lenses. I use mostly the K-1ii and the 28-105 is my every-day lens. Sits on most of the time.
I'm very happy with my K-1

[JimJohnson]

regarding SLR photography, I went from FF film to APS-C to digital FF. I still have my Super Program, K-3 and K-1. While I have APS-C only lenses I use with the K-3, I consciously considered the FF capabilities when adding lenses. My DA 35 and DA 40XS are not perfect on FF, but with the right subjects, the vignetting isn't objectionable. Of course my KA, F and DFA lenses work on all three bodies.

The first six months with the K-1, I slowly rebuilt my range of lens, beginning with the DFA 28-105, adding a used Sigma DG 70-300 APO and a used FA 20-40. I offset the cost by selling some of my little used APS-C only lens.

[SSGGeezer]

The 55-300 PLM is good longer than 180mm with some vignette, and the DA* 50-135 works very well in square crop mode. I have heard the 20 40 has some focal lengths that work fairly well also. If you are going to crop anyway, why not try any of the APSC lenses?

[officiousbystander]

Am I gaining anything?

Yes. A brilliant full frame camera with a terrific lens. Nothing will stop you from continuing to use the K3 with your APS-C lenses. It's still a fine camera.

[redpit]

You will enjoy the K-1ii & DFA 28-105 combo, trust me! As other members mentioned earlier many DA lenses cover the FF quite well and in any case you have the crop mode which offers 15Mpxls but also a faster FPS rate and a very large portion of the APS-C area covered by the AF points. You can't go wrong with the K-1ii, it worths the upgrade.

[fs999]

I shot for one year only in crop mode to get the same angle as my K-5IIs, then I begun slowly to use my lenses (when possible) in FF mode.
Now I rarely shoot in crop mode, only my moon shots are in cropped crop mode

It may well be the much more common D Fa* 50 1.4, Fa 50 1.4, Da* 55 1.4, or Da 50 1.8 versions.

Or FA / F 50mm F1.7 are worth too...

[bdery]

Really considering the K1ii with 28-105 kit from B & H. All my lenses are are APS-C & if I buy this kit I can’t buy any FF lenses for a while. Am I gaining anything? Currently using K3-ii

Late to the discussion but I was in that same boat when I first purchased the K-1. I expected to mostly use the K-3 and keep the K-1 for special occasions.

That didn't happen, I fell in love with the K-1's ergonomics right away.

However, given the recent release of the K-3 iii, this might be a better way to spend your money possibly. That being said, if you want full frame then by all means get the K-1, it's a great camera.

[Class A]

Note that the DA 40 and DA 70 are dedicated APS-C lenses, i.e., they do not produce a proper FF image circle. You'll see something in the frame, but particularly near their wide open apertures, these lenses won't produce high-quality IQ in the areas they were never designed to properly illuminate. If you will be dealing with small image sizes only, you may not worry about this, but please don't expect those lenses to work on an FF camera as if they were true FF lenses. There are APS-C lenses which work on an FF camera just fine without any qualifications, but the DA 40 and DA 70 do not belong to that set.

[Oldbayrunner]

when you crop to APS-C And you gain a wider field of view outside the frame, which can be helpful for sports, etc.

Not sure what you mean by this....It would only appear only wider through the view finder's visibility outside of the crop box, otherwise in that mode it captures a narrower field of view on the sensor hence the to15 mp reduction.

[fs999]

Note that the DA 40 and DA 70 are dedicated APS-C lenses, i.e., they do not produce a proper FF image circle. You'll see something in the frame, but particularly near their wide open apertures, these lenses won't produce high-quality IQ in the areas they were never designed to properly illuminate. If you will be dealing with small image sizes only, you may not worry about this, but please don't expect those lenses to work on an FF camera as if they were true FF lenses. There are APS-C lenses which work on an FF camera just fine without any qualifications, but the DA 40 and DA 70 do not belong to that set.

Then I must have a special DA70, because it works perfectly in FF mode. It is nearly as good as the DA* 55mm. I used it even on my *ist film camera...

my photos on Flickr

[y0chang]

40, & 70. DFA 100 2.8 Macro, 50 1.4. All work on full frame. Some of the DA limiteds may have some vignetting, but they work. Others like the DFAs and old FA were designed for full frame (the FA were film era lenses)

This is a good guide:

Full Frame Coverage of DA Lenses: Comprehensive Test - Gear Guides | PentaxForums.com