Lightnings taking a ride

by ceinmart

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56,990 reputation
8117263
bio website jonrista.com
location Aurora, CO
age 35
visits member for 5 years, 1 month
seen yesterday

I am a relatively new photographer, having been at if for only a few years. I chose Canon gear when I finally took the plunge into DSLR. I am an avid hobbyist now, and love everything about photography, from the gear, to the science, to the art. I spent years reading about the technology and photography theory, so I am very well versed in the technical aspects of photography. My artistic skills are moderate, but improving. You can see my work @ the following sites:

My interests lie primarily in nature photography:

  • Birds
    • Songbird Setups
    • Shore Birds & Waders
    • Raptors
    • All others
  • Astrophotography
    • Moon
    • Wide Field
    • Deep Sky
  • Landscapes
  • Wildlife
  • Floral Macro
  • Insect Macro
  • Abstract

I currently use the following gear:

  • Cameras
    • Canon EOS 7D
    • Canon EOS 450D (Rebel XSi)
  • Lenses
    • EF 16-35 f/2.8 USM L Wide
    • EF 50mm f/1.4 USM
    • EF 100mm f/2.8 USM Macro
    • EF 100-400mm f/3.5-5.6 IS USM L Zoom
    • EF 600mm f/4 L IS II
    • Canon EF 1.4x TC III
    • Kenko 1.4x Teleplus Pro 300 DGX
    • Periodic Rentals:
      • EF 300mm f/2.8 L IS II
      • EF 500mm f/4 L IS II
      • Canon EF 2x TC III
  • Filters
    • Lee Foundation Kit (x2) + Tandem Adapter
    • Lee .3/.6 ND
    • Lee .3/.6/.9 Soft Grad ND
    • Lee .3/.6/.9 Hard Grad ND
    • Lee CPL
  • Tripod
    • Gitzo Systematic GT3532LS 3S. Series 3 Tripod
    • Jobu Pro 2 Gimbal
    • Gitzo Mountaineer GT0541 4S. Series.0 Tripod
    • Gitzo GH1780QR Series.1 Mag. Center Ball Head

Nov
9
answered What DPI should I resize my image to for best printing quality?
Nov
9
comment How can dynamic-range be larger than sensor bit-depth?
+1, that Cambridge in Color article is excellent. It does a great job of explaining the value of larger photosites (deeper "wells") and how they affect dynamic range. It should probably also be noted that most sensors are not purely linear, most have an attenuated A/D conv. curve (S-curve) as you reach the extremes of shadow and highlight. In RAW, a digital sensor can capture a lot of data that can later be recovered, as your article demonstrated.
Nov
9
comment How can dynamic-range be larger than sensor bit-depth?
+1, great answer. One tip: I believe the word you need in place of "discretize" is "quantize": Quantize -verb: Math,Physics . to restrict (a variable quantity) to discrete values rather than a continuous set of values.
Nov
9
comment Is it problematic to mount a Canon EF 100-400mm f/4.5-5.6L lens on Rebel XSi (450D) body?
Y/W. If you think this is the correct answer, you can mark it as the "Accepted" answer by clicking the check mark next to the rating.
Nov
9
awarded  Nice Answer
Nov
9
revised How can I get everything in focus?
added 459 characters in body
Nov
9
comment How can I get everything in focus?
@Rafal: Thanks for the Ken Rockwell link. I should have remembered that one. I'll work it into the answer.
Nov
9
revised How can I get everything in focus?
added 612 characters in body
Nov
9
comment How can I get everything in focus?
It's always good to be back. ;-) Although I can't complain about where I've been...being out using my camera and taking pictures is always the best. :D
Nov
9
answered How can I get everything in focus?
Nov
8
comment What noise removal tools work best, and why?
+1 for Lightroom 3. With LR2, their noise reduction was pretty poor, but LR3 really pushes the envelope. I've been able to clean up some very badly noisy images shot at ISO1600 that couldn't be fixed before.
Nov
8
comment Is there a film scanner that can read the data from APS films and include it in the EXIF metadata?
@Rowland: So it appears...I though I had read somewhere that it did read the magnetic strip. I've done all the searches known to mankind on this subject. The only additional piece of information I can offer is "Magnetic IX (Information Exchange)" is another term to search for. Outside of the Fuji Minilab, there does not appear to be any other device on earth capable of reading the APS magnetic strip.
Nov
7
comment Do DSLRs play games with ISO when used with fast lenses?
...rather vague. They state many times that they normalize all images to an 8mp image 'printed' on an 8x12 (20cm x 30cm) image at 300dpi. They also state that it is "exactly" 8mp, however an 8x12@300dpi print is 8.6mp (3600x2400). If DXO has a page somewhere where they clearly and precisely state exactly how they do things, and it all adds up, they can clear their name with me, and I'll accept their results. But after digging through their site for a while, I have not found such a page. (Please send a link if you know of such a page, I would be very interested in reading it.)
Nov
7
comment Do DSLRs play games with ISO when used with fast lenses?
Regarding image size...if they "normalize" all images to exactly 8mp, then the images they compare are not objective. By scaling down images, they are applying some kind of interpolation and filtration to the raw sensor output. If their measurements are based on post-scaled images, then I can't help but question their results. If they crop, that is a different story, as cropping would at least retain as much information from the sensor as possible. Even with cropping, the image contents between sensors will not be identical, so you have another problem. Again, exactly what DXO does here is...
Nov
7
comment Do DSLRs play games with ISO when used with fast lenses?
Regarding my own measurements, they seem to be in line with what most other photography review sites (such as dpreview.com) state. I get between 7-8 stops of dynamic range on the 450D. If what you say about subtracting three stops from DXO's measurements is true, then their numbers are also in line with everyone else (10.7 stops - 3 stops = 7.7 stops, or between 7-8 stops of DR.) I am not sure where DXO states that you need to subtract 3 stops to get a real-world value for DR...if that is the case, they need to make that more obvious, as just looking at their raw data is misleading.
Nov
7
comment Do DSLRs play games with ISO when used with fast lenses?
"Most of the 4294967296 RGB value combinations you get with 36bit color are impossible". Unless I am mistaken, a 36bit image offers a total of 68,719,476,736 distinct RGB values. That is the number of distinct shades of each color (there are only about 2-3 colors detectable by the human eye, but the eye can detect far more shades of each color). I agree, you are not going to get perfect color with a Bayer array. DXO does not clearly state what that "21.6 bits of information" is. You usually don't rate an analog signal in bits, so if they are measuring an analog, they need a better unit. (dB?)
Nov
6
revised What are best practices for using Lightroom libraries?
added 716 characters in body; edited tags; added 22 characters in body
Nov
6
comment What are best practices for using Lightroom libraries?
Barring significant objection, I'll merge this topic with the one noted by Chills and Sebastian in a couple hours, as they are duplicates of each other.
Nov
5
comment How can you show texture?
+1 Good point about local contrast. Thats not noted enough, but its a very powerful technique.
Nov
5
comment Why is my picture muddy looking?
Looking at that photo on an uncalibrated screen, it is a lot harder to see the differences. If you want to see the improvement offered by local contrast, I recommend saving both the original and the modified versions, opening them in a tool like photoshop, and using layers, align them on top of each other. Turning the top layer on and off will make the improvement very clear.