Pentax Crop-ability

Before I decide whether to switch back to Pentax gear I need to decide on what focal lengths I would likely want and see if Pentax has the lenses I want.  Since 40mm is the longest focal length I have at the moment, I took a picture of the trees on the horizon with that limited 20-40mm lens.  Note the trees in the center of the first picture that are furthest away.  The second picture is a crop from that center portion of the first picture that I then up-sized to make the version you are looking at.  See the birds in the trees?  Now I have an idea of how much zoom-cropping I can do.

I made this check as I was trying to decide whether to get a zoom lens or the 70mm limited prime lens.  Based on this check and some ideas of what I might be photographing, I decided to try the 70mm prime lens.  My thinking is that I might do some of my walkabout and Homewood photography with the 70mm lens and the camera-lens combination wouldn’t be too heavy.