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Topics - rocket_scientist

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EOS Bodies - For Stills / 7D frozen when turned on
« on: May 30, 2013, 08:10:05 AM »
I am wondering if anyone else has experienced this before:

Last night my 7D froze on me and after some quick google searches, I found that the camera sometimes freezes after the firmware has been updated and the quickest remedy is to remove the battery and then replace it.  I removed the battery and this fixed the problem but I have not updated the firmware in quite some time; in fact, it is still on firmware 1.xx.

The camera would turn on and off, the sensor cleaning would perform but the camera would not take any pictures.  At first, the lens did not autofocus and after checking the lens, and putting a different one on there, the camera was still not working.  I then tried to change the aperture and this did not work along with the shutter speed (I could change the iso setting).  I tried changing to aperture priority and still no luck.  When I changed back to manual, the set aperture changed from 4.5 to 15.  After some more attempts at shooting, I noticed the aperture and shutter speed would change automatically, almost as if it were in full auto.  The camera gave no error codes.  I then did a reset of all of the cameras settings which still did not fix the problem.  As stated earlier, once I removed the battery, it worked fine.  I have had this camera for 3 years and have done two seasons of weddings with the camera (approximately 75,000 shots) and have had no issues like this.  My wife, the photographer that makes money at weddings in the family, has a wedding this weekend and she about had a meltdown while we were trying to figure this out.

I am just curious if anyone else has had a similar experience with this...

Lenses / Angle of view calculations
« on: October 05, 2012, 12:51:23 PM »
Maybe I don't fully understand all of the specifications that are described when looking at a lens but I would like to better understand the angle of view specification a little more clearly.  When you look at say a 300mm prime lens on the Canon website, the diagonal angle of view is said to be 8° 15'.  I am fairly certain this is for a full frame sensor as the angle of view (I think) is dependent upon sensor size.  If this is so, how would I use this information to determine the distance needed to frame a 6ft tall person within a crop sensor (portrait or landscape)?  That is, if I wanted to shoot a football game and would like to shoot from the 50yd line, how could I calculate the focus distance that a 300mm lens would "reach" for a full body shot without much cropping?  I understand it should be fairly simple geometry but I am not 100% sure as to how to approach it.  Anyone with some knowledge? 

As the above paragraph is probably convoluted, I am trying to figure out what focal length lens I would need for specific sports of I know my distance form the athletes. So if I am at the 50yd line, would a player at the 20yd line take up the full frame?

Pricewatch Deals / Canon 5D Mk ii for $1899.00 on Amazon!!
« on: September 14, 2012, 07:07:38 AM »
The Mark ii version is on sale for $1899.00 on Amazon!!

BH is $1979.00

Hopefully someone can get it for an awesome deal!

Maybe they are trying to clear out stock for the next "cheap" full-frame?

Landscape / HDR bracketing
« on: July 22, 2011, 11:52:59 AM »
I got a question for all those HDR lovers out there.  With Canon, one can only do auto bracketing (whether shooting in Aperture Priority or Manual) for three exposures.  For a lot of scenes that I come across, this seems to not capture the entire dynamic range of the scene.  My question is: How do you compensate?  Do  you manually expose 9 brackets and hope you don't bump your tripod or nothing dramatic changes in the scene?  Or, do you deal with only 3 exposures and if so, what is your typical range of compensation (ie +/- 1,2 stops etc)?

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