I've only had my K-x for less than 1.5 years, so I'm still kind of new at this. I'm kind of thinking out loud here, but I'd welcome anyone else who can help me figure some things out.
Basically I'm trying to determine why I like some of my lens so much better than others. To put it another way, what it is that makes photos of identical scenes taken with one lens so much better in my eyes than another?
I suppose there's two part to how I'm thinking about this.
Aspects of the lens:
I'm most interested in the pictures that get taken, but I definitely know that there are physical and mechanical aspects of lenses that are preferred. Some lens seem too heavy or unbalanced for my camera. Some seem to have more trouble focusing in darker settings or getting good pictures in such settings. (I'm not referring to lens speed here. I don't know if it makes sense, but some lens just seem to love light more than others... Can that be true?) There are also lens issues of how much throw there is in the focus and how and how much the zoom works. Some lens just seem a bit flimsier than others. Of course there is also simply the matter of preferring full manual to completely auto. I do like auto metering, though some lens seem to require compensation more than others. I haven't gotten used to using the green button consistently, so that seems like extra work to me, and I sometimes forget to do it. I like autofocus, but I also have no problems with manual focus. Using catch-in-focus on my K-x has performed quite well and better than my eyes and K-x viewfinder can do. (I did have to adjust for a little front-focusing.) Some lens are just less attractive than others or seem ill-proportioned to my K-x. Some lenses just seem to get more good pics than others, but I'll take that up in the next part.
So, the physical lens aspect is fairly easy for me to identify. Of the lenses I have, I really like
- The Pentax M50 1.7 is like an engineered work of art. Size, detail, heft, focus silkiness... It's beautiful.
- I just got the DA 18-135. So compact, quiet, fast, looks great on the K-x.
- The Pentax F 35-70. I don't want to call it cute, but it is such a compact, versatile lens with kind of a retro look.
- The DA-L 55-300 kit lens is amazing. I have to work at taking a bad pic w/ it. As a dad at a soccer game, I think it makes me look semi-pro without looking pretentious w/ some huge outfit. It's perfectly suited to its purpose.
- I wish I could like the Tamron SP AF 24-135 more. It's a gorgeous lens, and does everything well. It's just a little too big and heavy for the K-x. Hence the purchase of the 18-135, but I'm delaying on selling this beauty since I think it would be an amazing lens on a full-frame camera. (Before the Tamron, trying to find a less expensive walkaround lens, I got a Vivitar 28-105 Macro Focusing Zoom. Great lens, but again just too big, and manual focus on a walkaround lens was more work than I wanted.)
(So, combined with the physical aspects, I think this category also includes what I think most people describe as a lens' IQ: its ability to focus quickly and accurately with correct metering.)
Aspects of the photo: It all started with my first lens, the DA-L 18-55 kit lens. It's a handy enough lens, but I was getting a bit frustrated since it seemed I had to work so much to get shots that were significantly better than my old point-and-shoot. Then I tried out the 55-300 and realized just how great the K-x could be! But what is it about a picture that makes me like one better than another? In the lens review database, we can grade a lens on sharpness, aberrations, and bokeh. There clearly are some types of bokeh that are too much of something, but generally something 'creamier' is easier to appreciate than 'busier.' Aberrations are also rather easy to discern in terms of flare, CA, edge/corner softness, and distortions. The less of that the better. Sharpness, however, is where I'm having some difficulties as I look at my pictures. On one hand, I view most of my pictures on a computer monitor where filling the screen means I'm looking at them at about 35% of full size. (That's about 16x11" for me.) A picture can look great... but then I've fallen prey to the lure of pixel peeping, and at 100%, the pic no longer looks so sharp. I realize that 100% detail can be important if I need to do some cropping. I also realize that I can do a little sharpening in PP. As I look at my pics, however, sometimes the issue does not seem to be entirely one of sharpness as it is also of
contrast. It seems to me that greater contrast enhances the
appearance of sharpness. Is that true? I would include a photo's color
saturation as part of its contrast characteristics. It's color
accuracy (fidelity to the real thing) is another good quality. Further, there is the matter of what I think most would call the '
temperature' of the photo. Some lens are cooler or warmer than others, and it seems that Pentax lens have a characteristic temperature which I'm guessing is related to the lens coating.
As I said at the outset, I'm kind of thinking out loud here about why I like some lenses and photos better than others. I'm doing so to figure out how to take better pictures. (Composition of photos is probably more important than most of this, but that's not an issue of the camera or lens.) I'm also finding out why I like some lenses better than others and why different lenses are needed for different situations. So here are some things I've learned:
- The perfect picture (in terms of color, sharpness, contrast...) does not make for the perfect picture in every situation.
- Post-processing can enhance a pic quite a bit. I suspect that very few professional photos come straight from the camera to print without a little attention in pp. Once I learn how to use my equipment well to take better pictures, it's probably worth the time to learn how to use my Photoshop Elements better.
- A good pic does not need to be pixel sharp across the whole frame. Softness around the edges is sometimes desirable if you are trying to keep attention in the middle ninth + of the frame (thinking of the rule of thirds).
- Unless I'm planning to print at poster size (which I'm not), I should stop looking at pics at 100% zoom onscreen!
If you've managed to read this far, I hope I didn't waste your time! Still, comments, corrections, and other opinions and observations are welcome!