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Forum: Troubleshooting and Beginner Help
10-08-2012, 10:56 PM
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Wonderful, will try this out, doing the manual focus and then figuring just what f-stop to make this work is a pain especially when using a 300mm lens line this one, GigaPan: Tree close but even at f22 the DOF, and breeze killed me
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Forum: Pentax K-5 & K-5 II
01-07-2012, 05:56 PM
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Lets take the braceting to the extreme with the K-5... this is a excerpt of a doc for a couple of Pentaxian friends.
Externally processed HDR
All your cameras do perform "Exposure Bracketing" which simplifies the process. Your first stop if interested in exploring this I suggest open you camera manual and look up "Exposure Bracketing" , on the Pentax K-r and K-x you can automatically bracket three consecutive images at three exposure levels:
Step Interval Pentax K-r/K-x Bracket Values
1/3 EV ±0.3, ±0.7, ±1.0, ±1.3, ±1.7, ±2.0, ±2.3, ±2.7, ±3.0
½ EV ±0.5, ±1.0, ±1.5, ±2.0, ±2.5, ±3.0
• 3 images: 0EV > -1EV > +1EV (where 1 = bracket value chosen)
The Pentax K-5/K-7 has fewer bracketing values but can select between two, three or five bracketed exposures:
Step Interval Pentax K-5/K-7 Bracket Values
1/3 EV ±0.3, ±0.7, ±1.0, ±1.3, ±1.7, ±2.0
½ EV ±0.5, ±1.0, ±1.5, ±2.0
• 2 images: 0EV > -1EV or 0EV > +1EV
• 3 images: 0EV > -1EV > +1EV
• 5 images: 0EV > -1EV > +1EV > -2EV > +2EV
Where 1 and 2 based on bracket value chosen.
Note: Examples based on ½ EV step intervals so whole steps used.
Expanding your exposure brackets
If the scene requires it you can expand these bracketed shot ranges. After selecting Exposure Bracketing take your initial group of shots now adjust your EV Compensation so the bracketed shots move either to the right to gain +EV or left to provide additional -EV will allow you to capture the full range of the image you visualized.
Example:
• 5 images: 0EV > -1EV > +1EV > -2EV > +2EV Now if I press the button and watch my status screen either in the viewfinder, LCD or live view if available I can adjust the EV till I see +3.0 or +5.0 depending on your camera, basically you want your left hand bracket marker to be on one stop above your previous max. Now when I now take my bracketed picture will result in:
• 5 images: +5EV > +4EV > +6EV > +3EV > +7EV
Now we repeat this only we set our far right hand bracket marker to one step lower, -3.0 or -5.0 this results in:
• 5 images: -5EV > -6EV > -4EV > -7EV > -3EV
This gives us a 15 stop range total which is pretty amazing and likely far in excess of what would be needed. This of course could be modified to expansion of your dynamic range within a less expansive way with any duplicated exposure values deleted.
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Forum: Pentax SLR Lens Discussion
10-17-2006, 07:31 PM
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Already planning on purchasing one of the K10D but am looking at lens over 300mm. Anyone used the Sigma 50-500mm and if so what is your opion?
Dave
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