Focusing a lens requires moving the lens back and forth. That's the way it has been for over 100 years. This is even true with Nikon's SWM (silent wave motor) and Canon's USM (ultrasonic motor), where the mechanism for moving the lens back-and-forth is quiet.
Today I just stumbled on the following news that a company raised $30 million dollars to create cameras that can autofocus without mechanical movements! You apply voltage to a lens that changes the refractive index. WHOA!!!!!! I've heard lenses that can change opacity by applying voltage, but changing refractive index is a first for me. Imagine, if this is possible on a teeny-weeny scaled lens, who knows what the future of big lens technology will be like in another 100 years? In the 22nd century, we'll probably look back to 2010 and laugh at the $8000.00 super 600mm f/2.8L/G FX SWM/USM auto focus lens that weighs 999 tons.
2 comments:
can u make a posting about color correcting? how to do it in post processing and anything that can be done pre shooting? like any experience with expo disc?
-reecha
Several ways.
For a given light source, you can take a gray card (you can buy a standard neutral gray in any photography class), then take a raw picture of it. Raw preserves ALL color tones. Afterwards you find out the tone and set all the pictures to that (warmth value, tint value)
To do it BEFORE shooting, you need to use your camera's custom WB setting. Again, for a given (constant) light source, set the camera's WB to that gray card. Afterwards, all the pictures will have that WB. You can do either raw or JPG using this method.
You know what will really f*** up WB? If you use multiple light sources (tungsten, CFL, etc). Also mixing flash and tungsten... lousy and inconsistent results. This is why a lot of night time wedding pictures are BW, they just look better.
You know what an expo disc is? It's an over-priced piece of see-through gray card. Convenient, yes. Old idea, new product.
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