Saturday, December 15, 2012

Anyone like rainbows? How about those interesting light rays we can sometimes see across the sky at sunset?

There's an interesting site Atmospheric Optics - http://www.atoptics.co.uk/ - that has pages on understanding the various phenomena related to how light can interact with our atmosphere - rays, rainbows, etc.

What prompted me to look this up was a Tracy Art League gentleman who stopped into my last Beginning Photo class session on Thursday evening in the neighboring classroom. My laptop's background image is a 5-minute exposure of a wintertime dry Yosemite Falls under full moonlight, last January.
 
Rather than simply tell all the details of the "when" of this image, I asked him to study it and offer thoughts on it.





We ventured further into other Yosemite scenes, including last month's afternoon break-in-the-storm rainbow against Yosemite Falls.


Whether by vocation or avocation, this gentleman knew his atmospheric lighting phenomena, and mentioned things like "Alexander's Dark Band" between the primary and secondary rainbows, and the "Supernumeraries" just inside/below the primary bow...specific details of a raonbow I wasn't familiar with.








This site includes much more than an explanation of physics and geometry of rainbows. But, this was an interesting place to start.



Enjoy your explorations, and may the findings and rewards prove worthwhile.


Best Wishes...

Richard D. Beebe
...photographer -
......N. California
...photography instructor -
......Grand Theatre Center for the Arts,
......Tracy, Calif.
https://plus.google.com/u/0/photos/113590669695127840854/posts

Monday, October 8, 2012

Making vs. Taking a Photograph

Ansel Adams: "You don't take a photograph, you make it."


I found this quote on photographer-friend Jeff Sullivan's blog page, http://activesole.blogspot.com/. My first thought in reading was in remembering the goal of a student in one of my Intermediate Photography classes a couple years ago. It was exactly the opposite; wanting to learn how to "take" rather than "make" an image.

His reasoning was this: the making of would involve, in his mind, the idea that something would have to be applied to the original frame to produce the image. To some degree, he's right in that very few final images are great right out of the camera, nothing added to improve or alter. But, what he was after is learning to create in-camera, to get that first step 95% right (or better) before having to rely on Photoshop or Lightroom or something else to pull the impression out of the image, sometimes kicking and screaming all the way to the final print. He wanted to hone the "taking" to minimize the post-production "making" after-effects and adjustments. (The concept he had differs dramatically from a photographer seeing something in the original scene that is intentioned even then to be requiring of post-production techniques to "make" that personal minds eye photo-impression...which is very much in line with Adams' mindset.)


If you can get the exposure right while still standing there in your scene, so much the better. It comes with learning how your camera sees the world it's pointed at. I have long said, and written, that cameras are idiots. Their expense, bells and whistles, image size, etc., doesn't matter. They will try to think and act on your behalf, like a free-wheeling agent, but have absolutely no idea what's in your mind, what you're looking at, what your intentions are. But, quite blindly, it will be most happy to try to do the work for you, like an over-eager little puppy dog wanting to please master.

The adjustment process is rather one-sided: you learn the processes of your camera, not the other way around, not it of you. You learn the sensor's idiosyncrasies, just as we did in years past with learning how particular films recorded what was captured on them. Some digital cameras have manually-adjustable controls to tweak it more to your minds eye - color sensitivities, contrast, saturation, white balance, etc. - but the camera, by itself, won't change for you just because you might wish it to. Once you know just how it will behave, with experience, you can adjust your eye to match how it sees, and get better initial captures without having to pull out your magical photo-editing tool kit when you get to your laptop or home pc. Some of this also involves not shooting scenes you know will exceed what the camera can actually handle, whether digital or film. Some overly-contrasty original scenes will require ample HDR frames with post-production effort to render it worthwhile...but, there are some scenes that are simply better left to our eyes to appreciate and enjoy. Some in-camera techniques outside of the camera, itself, may be brought into play - filter use (maybe a polarizer, or a graduated grey or color) and/or external light manipulation (flash/strobe, scrims or reflectors, etc.) - to manually adjust what the camera can't. With this, you ARE moving closer to the taking rather than making, especially if the image is a straight color photo-journalistic capture, simple color portrait, or a 'fine as it is' color landscape scene. Congratulations, you've done what many photographers strive to accomplish!

Ansel Adams was renowned for his black-and-white image production. The original frame was but one step in the series of them that led from "seeing" the impression in the original scene, then using the in-camera techniques to capture it, knowing there would be follow-up adjustments to merge latent imagination with print reality - specific film development to match the film's sensitivities and exposure; print creation and development to make from that negative what he had in his mind. Nothing about the execution was instant. Nothing about the process was without experience with the various tools and the wisdom to understand how they are applied for a given result.

Granted, a similar process with image-development still exists today, from becoming aware of a scene or situation to want to capture, to the actual recording process, to the follow-up with whatever software is used to craft the raw file into your particular impression. Except for the change in technology involved, Adams' "hierarchy of an photograph" hasn't changed, from inception to presentation. (and the first step never was to "take the picture": that point is actually third down the list!)


 
So, which direction in this processing is right or wrong: taking or making; making or taking? Reality and honesty will claim both are interconnected. It depends upon the situation involved. It depends upon what the intended final impression is supposed to look like, relative to the original scene. For many, getting the exposure and framing just right the first time will have the taking equaling the making, with only a resizing and adding personal copyright text being applied after-the-fact. Been there and done that 90% of the time. Others will still require your attention to shape the initial reality into what a more internalized version of was experienced or felt within you. There, you still have making as theat working process to drive through.

But, that's the nature of image making. Enjoy it.

Saturday, April 14, 2012

The Yosemite Conservancy has reportedly moved it's webcam page. When I double-checked the "new" link to the previous one I had - http://www.yosemiteconservancy.org/webcams - they matched, so maybe the info isn't exactly new. Those who have some enjoyment of that wonderful Valley may enjoy drooling over the images over coffee, or lunch, or dinner later in the day. 

The Ahwahnee Meadow cam is looking east at Half Dome on the Valley floor, east of Yosemite Village, and gives a decent idea of what conditions there are like (especially when teamed up with the one noted in the paragraph below). The first one, Turtleback Dome, is located on the open dome above Hy. 41, west of the long Wawona Tunnel, looking back into the valley. The 4th webcam is also there, looking west.

There is also one MORE webcam, operated by the USGS. The location is at Happy Isles, where the Merced River spills into the Valley east of Curry Village - http://ca.water.usgs.gov/webcams/happyisles/ - and that little building the lens at is their automated monitoring station (scroll down the page to see the river flow, as well as the history of the gaging station. The two parameters monitored at this station - http://cdec.water.ca.gov/cgi-progs/staMeta?station_id=HIB - cover the river's flow rate (cubic feet of water per second = cfs) and depth (in feet).  Anyone familiar with the spring/summer flow of the river will recognize the "diurnal fluctuation" in the graph, the change between day and nighttime flows, caused by melting snows much higher up in elevation, which doesn't instantly appear miles below in the valley. There have been times when campers went to bed cozy and happy, and awoke at midnight being getting flooded...or when otherwise empty campgrounds are seemingly left empty on purpose, for no apparent, good reason. The highest flows are actually in the middle of the night, and lowest in mid-day, rising and falling once a day almost like a tide.

Enjoy.... 

Best Wishes...