Behind the Lens TV
Monday, March 17, 2014
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Thursday, April 24, 2008
A digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that uses an automatic mirror system and pentaprism or pentamirror to direct light from the lens through the viewfinder eyepiece.
The basic operation of a DSLR is as follows: for viewing purposes, the mirror reflects the light coming through the attached lens upwards at an approximately 90 degree angle. It is then reflected by the pentaprism to the photographer's eye. During exposure (when the photograph is taken), the mirror swings upward, and a shutter opens, allowing the lens to project light onto the image sensor.
OK, that is all you realy need to know about SLR cams, if you want more techy stuff you can do a google search for the history, how they are made, etc... but for now lets move on to exposure
Wednesday, January 23, 2008
I guarantee you after you learn how to read a Histogram you will never take another over/under exposed picture again you ready? watch this lil Video then join me as we dive into the Histogram
Thursday, January 3, 2008
<--Slow /Blur Fast/Freeze-->
1 sec. 1/4 1/8 1/15 1/30 1/45 1/60 1/90 1/125 1/180 1/250 1/350 1/500 1/750 1/1000 1/1500 1/2000
This is just a sample scale, my cameras shutter speed goes down to 30 seconds, it also has a Bulb setting that allows you to hold open the shutter for as long as you want by keeping the shutter release button pressed.
Phot by: doniedsilva
See how the water looks soft and milky, this is accomplished by a slow shutter speed allowing the waters natural movement to be relayed to your photo by a slow shutter speed.
Another great use for slow shutter speeds is night photography. I shot this image at 2:00 am in thick fog. Both of these were shot at slow shutter speeds of a minute are longer do to the fog and I was using a aperture of F22 for maximum depth of field and ISO 400 to cut down on noise.
Noise, lol this dude is off his rocker what is he talking about noise for? This isn't a TV broadcast or radio, why is he talking about noise?
LOL, yes indeed, a photo can be real noisy, especially in a dimly lit stadium full of screaming fans. But don't worry, When you are forced to take photos in a potentially noisy place I will introduce you to the photographers secret Assassin The Noise Ninja....
Follow me to ISO/Film Speed
Wait a minute, you told us the shutter can tell a lie, did you lie?
Well I did explain how the shutter can tell it's own verion of the truth but if you want one more example here it goes.
There were these two neighbors who always got in to it over a new motorbike that was bought Tom use to always complaint to Jim about the noise that Jim made early in the morning when he was heading to work. After a few weeks of fussing back and forward over the fence and trips and calls to the police Tom decided to set Jim up. One Sunday evening Tom set up his tripod and cam in his living room opened up the window and waited for Jim to pull up. as Jim turned the corner and headed down the street to his house Tom fired off a few shots.
The next day the police were at Jim's house responding to a report of speeding in a residential area. Of course Jim denied everything knowing that his street is populated with many kids who like to play kick ball in the street on the weekends and he never would speed. But after the police produced a photo of him zooming by a clearly posted 15 M.P.H. speed sign his jaw dropped, The photo showed Jim going so fast that you could see streaks of color trailing behind him.
Now to a untrained eye this would be a very believable photo. But little did they know that Tom had set his shutter speed so slow that even if a kid would have rode by on a tricycle the pic would give the illusion of the lil kid doing well over 50 M.P.H.
ok, now can we head to ISO?