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jrista

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meta site favicon meta user | stack exchange network profile network profile
45,998 reputation
475212
bio website jonrista.com
location Denver, CO
age 33
visits member for 2 years, 10 months
seen 9 hours ago
stats profile views 1,766

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 300mm f/2.8 L IS II (Periodic rentals)
    • EF 500mm f/4 L IS II (Periodic rentals)
    • EF 600mm f/4 L IS II (Periodic rentals)
    • Canon EF 1.4x TC III
    • Canon EF 2x TC III
    • Kenko 1.4x Teleplus Pro 300 DGX
  • 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

4,322 Actions

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9h
 revised How many “MegaPixels” can the human eye see?
edited body
16h
 comment How many “MegaPixels” can the human eye see?
...such as 20/10, one would need 280ppi. At 24", that number drops to 210ppi! (In the case of most ink jet printers, DPI is a fixed factor...default dots per inch in a Canon is always 4800x2400; in an Epson it is 5760x1440...regardless of the actual printed image resolution.) So, I'm sorry, but your facts are skewed, confused, and in some cases just wrong. Please see my answer here.
16h
 comment How many “MegaPixels” can the human eye see?
I also need to ask that the postulations in this answer be referenced. I know where the 576mp number comes from, however it is an unreferenced number for any casual reader. Some of your numbers are just flat out wrong, unless you are using mixed meanings for the term "DPI" (which I've already noted is a terrible term to use in this context.) The FACT here is that as viewing distance INCREASES, minimum required spatial print resolution DECREASES. Assuming slightly higher than average visual acuity (say 20/18), a print at 18" would only need 230PPI. Assuming someone with high visual acuity...
16h
 answered How many “MegaPixels” can the human eye see?
17h
 comment How many “MegaPixels” can the human eye see?
I really have to QUASH the use of DPI in situations such as this. DPI stands for DOTS per inch. A Dot is an arbitrary measure...and it means different things in different contexts. The only appropriate term is PPI, pixels per inch, as that is the smallest complete element of the PICTURE that as a photographer you are capable of working with.
1d
 comment What might be causing my AF system to misfocus?
@mjr: Generally speaking, Canon requires lens/camera alignment and lens repair to be done by an actual Canon Factory Service Center. If you take it into a local repair shop, they will most likely send it into Canon anyway, however that usually takes longer. Canon puts direct customer requests at highest priority, and turnaround time is usually no longer than a couple weeks (could be as long as 4-6 weeks with a local shop.) Also keep in mind, the service is not free, nor is it particularly cheap...I recently spent $500 having JUST a lens repaired for a minor thing.
1d
 comment What might be causing my AF system to misfocus?
You probably want a larger, much higher resolution version of that image as well. Printing that tiny thing out is going to result in a soft chart right off the bat, making it difficult to precisely tell where your focal plane is. You want a version of that chart that can be printed on an 8.5x11" with at least 300ppi resolution (600ppi would be better).
1d
 comment What might be causing my AF system to misfocus?
It should also be noted that lenses and cameras can be non-ideally calibrated relative to each other. The Rebel line of Canon cameras does not offer AF micro adjustment (AFMA). The only way to fix front or back focusing, which CAN and DOES occur, is to swap out for a different lens.
1d
 comment What might be causing my AF system to misfocus?
I think you may be performing the tests wrong. AF tests MUST be performed with precision...at proper distance, with the test chart at EXACTLY the correct angle, with the test chart properly level in the frame, etc. It is also really best if you brightly illuminate the test chart, as AF performs slower and less accurately in lower light (a point NOT made frequently enough). The first thing I see is that the test chart, distance, and illumination are all off. The chart is not properly angled to the lens...it should be entirely parallel to the sensor, and properly horizontal.
2d
 comment Why does the Lightroom Adjustment Brush introduce noise?
@Bart: The use of difference mode would be appropriate here. Divide has a different purpose, and wouldn't really serve your goal of determining if there is any "difference" between the two photos. I agree with John, I think this question should be left open...but it is up to the community, and if you wish to close, you can always cast your vote.
May
19
 comment Why are tulip lens hoods more expensive than cup lens hoods?
@D3C4FF: Keep in mind, the lens hoods for high end lenses like that are not simply injection molded plastic. They utilize the same materials as the lens barrel to maintain durability, are multi-layered with multiple materials for weight & balance, and are larger and use more material volume than most lenses in totality.
May
19
 awarded  Enlightened
May
18
 awarded  Nice Answer
May
18
 comment Why are tulip lens hoods more expensive than cup lens hoods?
@D3C4FF: When you spend $18,000 on the new Nikon 800mm lens, a grand for the hood sounds down right reasonable! It's only 1/18th the price of the lens! :P
May
17
 reviewed Approve suggested edit on How do you choose among different 70-300mm lens for Nikon DSLRs?
May
17
 reviewed Approve suggested edit on How to troubleshoot Canon Speedlites that are not firing at the same time
May
17
 reviewed Approve suggested edit on What software should I use to batch cropping images from paper notes?
May
17
 reviewed Approve suggested edit on How do I achieve deep blue light night during the day effect?
May
17
 reviewed Approve suggested edit on maintenance tag wiki excerpt
May
17
 reviewed Approve suggested edit on What are the optimal settings for scanning photos?
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