Thursday, February 28, 2008

Chair number 43

3D chair

Okay, so I feel really bad about failing to provide new venues for discussion this week. And last week.

It's been bad for "teh artz lol."

I'm posting this because, even at f3.5, my 43 demonstrates an amazing 3D quality.

I took a picture of a chair because it arrived with a small tear in the fabric near the back of the seat cushion. I love the rendering qualities of the 43... people who harsh on it don't know what they're talking about. There's more to life than corner sharpness wide open, you know.

Thursday, February 21, 2008

The moon done gone and gone

So, Josh - did you have a clear night to use your glass at the sky?

Sorry I've been unproductive lately. Extreme cold coupled with a general lack of interesting subjects nearby have kept me from doing anything in the last week. I'm hoping I get to find something to shoot tomorrow (if campus is closed) or Sunday evening, but who knows.

Wednesday, February 13, 2008

icederp

hydrant

It demonstrates the ice accumulation as of 12:00 last night. Shame about missing the trees today.

Incidentally, happy birthday camera was on Tuesday. Wasn't a share with the public picture, but worth mentioning.

Thoughts on fringing

I took some pictures last night of the ice stuff, then drove my car around an icy parking lot like a madman. It was fun, but I left all of that at home because of the water. Big mistake, there was a really cool "tree laden with ice that's assaulting the sidewalk" thing going on outside. Oh well.

I'm writing this, though, to muse about "purple fringing" as an image aberration. Someone posted a comparison of the Voigtlander (sp?) 40/2 and the Pentax DA 40/2.8, which garnered a response from someone who had compared the lens to both the DA 40 and the FA 43 (which I have). Their conclusions were that the Pentax lenses both produced more purple fringing.

This sticks out because I've never noticed the 43 to produce purple fringing - it has standard lateral chromatic aberration, but it is relatively well behaved until I get into such high contrast situations that sensor blooming takes over the boundary regions.

Then it struck me - people don't understand the difference between lens aberrations and digital sensor woes.

Why would this have hit me? Simple - the wikipedia article makes it apparent that the internet believes that purple fringing is more of an issue for digital photography than film. If what we were seeing was due to lens errors, it would be just as present on film exposures in the same conditions as the digital exposures with the same lenses.

I've looked at some of my shots with film that I still have online and am not seeing anything in that nasty purple range at all in my images, let alone at high-contrast boundaries. Even in a shot with the DA 10-17 on my MX, I don't see what could be described as purple fringing on the right side - the trees simply start disappearing into the sunlight. There's another thing that leads me to believe it's sensor related more than anything else: it's the same color as the nasty artifacts that come off to the north, south, east, and west of the sun in images like this one. Fortunately, in that case, most other people don't notice the problem, but it screams to me "DIGITAL! DIGITAL!"

I don't know, I'm thinking it might be fun to set up a test with some lenses "known" to cause purple fringing and shoot the same images on digital and on film and see if you get the same results.

Basically, I don't buy purple fringing as a strictly optical phenomenon; I believe it's the medium that makes or breaks it.

Sunday, February 10, 2008

Daniels in Brief

dam
This is the old Daniels dam from a different place than I might have shot it before. I wanted to cross the river here on the rails, but they have been fenced off by the companies that currently make use of the old millspace on the shore here.

roots
Near the Methodist church, the road bank is held up by a concrete wall. In many places, trees have grown near it and their roots have climbed up and over the top where there was dirt on the other side to grow back into.

floodgate
I like the rusty floodgate mechanism. This is from atop the fish ladder grating.

Today marks the first time I've used the 16-45 since I got the 43. I was only out for about half an hour, so I didn't get to use any of the rest of my kit... the winds had started picking up to the point where the valley was being hit, so I didn't feel like walking up the north side of the river to explore the ruins on that side. That's for a less arctic weekend.

Thursday, February 7, 2008

Exploring SMC

I've known about this for a while, but hold your lenses obliquely to a point source of light in the right way and you'll get this:

77front

That's the 77 through the eye of the macro 50; it's a full frame shot.

Sunday, February 3, 2008

Feather detail

birdcrop

This is a center crop of a shot I took with the 77 at the bird house yesterday. 1/640sec, f2.2, ISO 800.

I'm not even sure I got the focus right...

Saturday, February 2, 2008