Category Archives: Commentary

Regarding Sharpness. And Obsession.

December 17, 2010 G Dan Mitchell 3 Comments

We have all seen the lengthy discussions about “which lens is sharpest.” While the ability of a lens to resolve detail is certainly important, it is not the only thing that is important. And in many cases, knowing which is the sharpest lens is not as important as know which among a number of sharp alternatives best suits your needs. I stumbled into another discussion of this topic online today and posted the following as my contribution. (Slightly edited here from the original post.)

Folks sometimes allow themselves to become completely distracted by “sharpness” to the point that they overlook a whole bunch of other important issues in their quest to find the holy grail of “sharp.” This can become the equivalent to realizing that good tires are important on a car, and then deciding to buy a particular car because it comes with the “best” tires… but is too big to fit in your garage, costs twice your annual income, has a terrible repair record, needs a tune-up every 750 miles, and only comes in a color your spouse hates.

For a few people doing certain types of very critical work, printing very large, working slowly and methodically, and willing to forego the compensatory advantages of other lens options, lenses like the excellent TS models, lenses from another manufacturer that only work with adapters, classic primes, and so forth might make some sense.

But just because a lens might measure a bit better to some extent in one of the areas that is measurable (e. g. “sharpness”), it does not necessarily follow that it is a better lens, nor that alternatives that may measure differently in sharpness – but are very nearly as good – will not also be excellent performers. It is also not true that these specialized lenses are required to produce large and effective prints.

It is interesting to watch people go through a process that may look something like the following at times, as they…

1. decide they need a sharper kens.
2. research lens sharpness.
3. consider only sharpness and overlook or dismiss other issues, including those mentioned in the sources analyzing sharpness.
4. decide that some lens is the “sharpest” – frequently some expensive prime, the most expensive zoom they can find, an alternative brand, a specialized TS, etc.
4.5. lust after said lens for some period. The excitement builds…
5. purchase the aforementioned Really Really Sharp Lens.
6. use the new lens and glory in it’s pure Divinely Sharp Wonderfulness, thereby confirming their wise choice.
7. share their wonder with others.
8. make more photographs, and eventually come to find out that a) in real photography the sharpness difference is rarely visible, b) there are downsides to using the sharper lens, c) the downsides sometimes compromise or lose the shot, and d) in many cases their previous “less sharp” lens proves just as useful and effective.
9. note that the new super Super Lens, while useful, begins to spend more time in the bag, and…
10. learn an important lesson or two about Lens Lust… or else repeat the cycle with a different WonderLens. :-)

To be clear, I’m not suggesting that sharpness is unimportant. I’m just encouraging people to keep things in perspective.

Commentary, News, Site News

Two Holiday Rituals

December 15, 2010 G Dan Mitchell 4 Comments

I have two holiday photographic rituals this time of year. I have begun one and will soon get to work on the other.

Today I began going through all of my raw files from 2010. I don’t even know how many thousands of files there must be, and it is perhaps better that I don’t know! Each time I do this year-end review I find a number of photographs with potential that I did not see right after I made them. Sometimes it simply takes a bit of distance in order to see what is there; other times I just moved on to another project before I was truly finished with the previous one. Don’t be surprised to see of these photographs posted here over the next few weeks.

Soon I’ll begin the second task, trying to pick my favorite photographs of 2010. I also enjoy this since the process lets me revisit and relive some of the experiences I had as I made the photographs. Given that I work from my “daily photograph” pool, it should be easier than reviewing the raw files – instead of thousands of files there are only a few hundred. However, it always turns out to be harder than I think it will be. I think there are perhaps two reasons. First, while most of the raw files are not really worth a second look, the photographs from which I select the “favorite of the year” images are all images that I like. This makes it very hard to narrow the selection down to perhaps ten or twelve photographs. Second, in some ways I am the least qualified to understand my photographs. That may sound odd, but no one else can see them in the same way that I do since I was there when they were made and thus know things about them that only I can know. Other viewers are perhaps better able to simply view them “as photographs.”

Regarding the second task, feel free to share your ideas and suggestions concerning the selection process or even to suggest specific photographs that might have connected with you.

Commentary, Equipment, Ideas

More Thoughts About the Pentax 645D ‘mini MF’ Camera

December 5, 2010 G Dan Mitchell 4 Comments

I responded to a post today in an interesting forum discussion about the new Pentax 645D “medium format” (or, as I prefer to call it, “mini MF” format) digital camera. This is a potentially game-changing camera. I has a 33mm x 44mm 40MP sensor and a body-only price of under $10,000. Its cost is far below that of competing mini MF bodies and a fraction of the cost of recent larger MF systems – and the price isn’t much above that of the high end full frame DSLR systems. While larger is not always better, for some types of photographers this puts a level and type of digital camera performance within reach.

In the discussion forum thread I referred to above, a writer had suggested that the 1.7x size differential between the Pentax 645D and full frame DSLRs would not be significant. In a sense he is right – it will not be significant to most photographers, and I surely cannot imagine why anyone would get one in order to make family photos to post on the web. However, I thought I’d share what I wrote concerning why I think that this might be significant for at least some photographers. My response (slightly edited) follows:

Photosite density is rarely the limiting factor when it comes to maximum print size from DSLR originals. As [the other poster] points out, “technique” stuff tends to be much more critical. Enlargement limits are more likely the result of stuff like camera movement, slight mis-focus, lens issues, etc.

I disagree that the size difference between the 24mm x 36mm full frame DSLR sensor and the 33mm x 44mm “mini MF” sensor isn’t significant. There are several reasons I feel this is the case: Continue reading More Thoughts About the Pentax 645D ‘mini MF’ Camera →

Commentary, Photographs: Nature, Photographs: Northern California, Photographs: Sierra Nevada, Photographs: Yosemite

Glacier Point and Ground Fog in Ahwahnee Meadow, Autumn

November 19, 2010 G Dan Mitchell 8 Comments

Thin morning ground fog floats above the dry autumn grasses of Ahwahnee Meadow below the granite cliffs of Glacier Point, Yosemite Valley.

During the cooler and wetter months of the year, ground fog often forms in the meadows of Yosemite Valley. Ahwahnee Meadow is one of the places I like to photograph these conditions, and since this was the morning after a damp and rainy day, I arrived here very early in anticipation of conditions that might produce the fog. It was very cold when I arrived, certainly below freezing by at least a few degrees. At first the fog was much denser and a bit deeper. I have photographs from this earlier pre-dawn period when a herd of deer passed through the meadow. Eventually, as the sun rose high enough that the light beams began to clear the mountains to the east of the Valley, the first light began to strike the upper slopes and walls of Glacier Point. As this happened and the air began to move and the temperature stopped dropping, the fog began to thin. This photograph was made shortly before the fog actually dissipated completely, and thin streamers of mist are broken up by clearer areas.

I have to admit that I do not know what the foreground plant is. (Hint: I won’t mind even a tiny bit if someone wants to write and tell me! :-) Cottony tufts are found at the top of long stems, growing out of odd shaped pods. I shot this with a very wide angle lens so that I could include some of this foreground foliage and the fill width of Glacier Point.

On a technical note, this image incorporates a blend of two exposures. Portions of the sky at the left side of the frame were very bright, while much of the rest of the scene was in shade and a lot darker. Almost the entire frame is from the 1/15 second exposure, but I have manually blended in a bit of the 1/40 second exposure in the area of cloudy sky at upper left in order to retain a bit of detail there. Also, though it should be obvious, this was shot with an ultra-wide angle lens – a 17mm focal length on a full frame DSLR. If you are at all familiar with this location in the Valley you will recognize that this is a bit of an unusual view.

This photograph is not in the public domain and may not be used on websites, blogs, or in other media without advance permission from G Dan Mitchell.

Photographer and visual opportunist. Daily photos since 2005, plus articles, reviews, news, and ideas.