Alley in Pisa, Italy

by Lars Kotthoff

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53,439 reputation
7103241
bio website jonrista.com
location Aurora, CO
age 34
visits member for 4 years
seen 10 hours ago

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

Jul
23
comment What, technically, is happening when one adjusts the 'Exposure' setting in a raw editor?
I am not sure we can get a good single answer to this question, and certainly not a technically accurate one for all major RAW editors (given that some use proprietary technology.) I know that RawThearapy tends to be fairly linear in many of it's adjustments, where as Lightroom is most decidedly non-linear (i.e. adjusting exposure shifts the middle range of tones more than it does the highlights and shadows.) This question may be difficult to answer adequately.
Jul
19
comment Full wavelength range for CCD and CMOS sensor?
These are highly generalized. It's actually very rare for a CMOS sensor to have 60% Q.E., as most these days are around 40-56%. The CCD Q.E. is also highly misleading. CCD Q.E. ranges from 40% to over 90%. Furthermore, the range of sensitivity is very dependent upon the filtration used...base silicon sensitivity is actually quite high from the deep UV (150nm) through deep or long-wave IR (1500nm or so). It really depends on the specific design, materials used, etc. what the sensitivity curve and sensitivity range is.
Jul
17
revised What is a “diffraction limit”?
added 25 characters in body
Jul
17
revised What is a “diffraction limit”?
Fixed missing GIF image
Jul
17
comment What was done to this photo to get a surreal tone of pastel-like purples and blues?
user28116: You should write your own answer, as I think you nailed it on the head. Magic was done in real life with light, not in post. You deserve and up-vote and an accepted answer. ;)
Jul
15
awarded  Yearling
Jul
11
awarded  Guru
Jul
2
awarded  Inquisitive
Jul
2
awarded  Curious
Jun
25
revised How and why do you use an image histogram?
Cleaned up formatting of recent edit
Jun
24
reviewed Approve suggested edit on How and why do you use an image histogram?
Jun
11
comment Applications of dynamic range trick
I am not sure that this question is a good fit for our forum. It's fishing for other people to come up with answers that they cannot already know and which cannot be researched. As such, it really isn't exactly a question, it's a work order. Is there any way you can turn this into an actual question that may have benefit for the photographic community at large over a long duration of time?
Jun
10
comment Why can't my camera autofocus in low light with a small aperture?
Don't make the mistake of assuming the performance of your NEX is indicative of all cameras and all brands. I use a Canon 5D III with the EF 600mm f/4 L II lens. I never missfocus, focusing in BLAZING fast, and it's DEAD ON every time. Canon's current 61pt PDAF sensors are top of the line, with very high precision and accuracy, with an extremely low miss rate. Mirror-slapping DSLRs are highly refined devices, and PDAF is not a handicapped mode of AF operation...when done right, it's simply the best way to do AF these days.
Jun
8
comment Why can't my camera autofocus in low light with a small aperture?
Contrast-only mode, which depends on some kind of live view (which may not be an option), may work better, if you have the kind of time required for contrast detection to actually work. CDAF takes time, it requires the camera to literally hunt back and forth for focus. That works great for still subjects...for moving ones, PDAF is the only real option.
Jun
1
comment Strange color difference between Rebel XS & 70D
Ah, sorry, I thought the XS was the 350D. Well, then there isn't as much of a gap in the fabrication technology. The 70D is definitely a modern fabrication compared to the 1000D, but I wouldn't expect there to be any significant difference in the response curve of the silicon.
May
31
comment How can I make successful abstract photographs?
I kind of agree with Michael, I'm not exactly seeing "abstract" in these photos. Maybe "not quite normal", but not "abstract".
May
31
comment Is the format for the distortion and chromatic aberration correction of µ4/3 lenses documented?
As for the downvote, I don't really care. I think it was unwarranted and unjustified, I don't think you actually read my answer within the context in which it was given (nor the timeframe, which was four years ago), but the only way to allow you to undo it would be to edit my answer...and there is really nothing to edit. I offered up the best information there was at the time, and I am not ashamed of that.
May
31
comment Is the format for the distortion and chromatic aberration correction of µ4/3 lenses documented?
@bronger: Your still missing the point. I linked THE BEST and THE ONLY information that was available, PERIOD, back when I created this answer. The links I offered are the only "documentation" that was available. If you actually read my post, I was well aware that the links I provided were only helpful for the OP to reverse-engineer a solution himself...BUT IT WAS ALL THAT WAS AVAILABLE. At least I offered as much as was humanly possible at the time the question was asked, rather than simply not answering at all because I wasn't providing the right kind of "documentation"...
May
31
comment Strange color difference between Rebel XS & 70D
@MichaelClark: Are you sure? I thought it was released in 2005. Were talking the 350D, right?
May
30
comment Strange color difference between Rebel XS & 70D
Agreed. The reasons the 70D is more expensive have less to do with the physical characteristics of the sensor or firmware, and more to do with it's capabilities and modern age. You can normalize the results with RAW in post, that is easy enough. If you insist on OOC JPEG, then you can still tweak the styles a little bit with the XS to get a result more similar to the 70D. I also recommend trying both cameras with the Neutral picture style, which should reduce any differences as the point is to minimize what the camera does to the image.