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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 5 hours ago
stats profile views 1,767

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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Jul
29
 comment How do you optimally resize and sharpen images for printing?
Thanks for the info, Guffa. Could you provide a bit more information about how unsharp mask works, and why you chose a base radius of 0.1mm? I enjoy theory, so don't worry about keeping your answer super simple...the more knowledge I have, the more effective I can be.
Jul
29
 comment How do you optimally resize and sharpen images for printing?
No problem. I've been doing some heavy research, and I think I'll answer the question myself. However, I'll probably start a wiki thread to do it in, so search engines can pick up the information. I've learned a some very interesting things about dpi, ppi, tonal range, etc.
Jul
29
 revised How do I interpret an MTF Chart?
deleted 107 characters in body
Jul
29
 answered How do I interpret an MTF Chart?
Jul
29
 revised How many optical aberration types are there in lenses? And what are they?
added 534 characters in body
Jul
29
 comment How many optical aberration types are there in lenses? And what are they?
@Eruditass: I'll clarify that part. By "better", I meant larger pixels with more effective microlenses over the photosites. I wouldn't say it is so much the spacing of the photosite, but the size and effectiveness at gathering incident light.
Jul
29
 comment How many optical aberration types are there in lenses? And what are they?
@Karel: Granted, there are additional types of aberrations like coma, spherical aberration, etc. Generally speaking, most camera lenses these days include aspherical lens elements that correct such aberration, and it is rarely if ever a problem. I could add those to my answer...however I am not sure they occur often enough to be a major problem.
Jul
29
 revised How many optical aberration types are there in lenses? And what are they?
deleted 23 characters in body
Jul
29
 comment How many optical aberration types are there in lenses? And what are they?
@Eruditass: Technically speaking, diffraction is the bending of light around an obstacle, and has little to do with pixels. In the context of a camera, diffraction is caused when light passes through an aperture lower than its maximum setting. The distortion in the lights waveform creates something called an airy disc. When using small enough apertures, the airy disc effect can grow large enough to affect more than one pixel at a time, resulting in softened images. The larger your pixels, the smaller your aperture needs to be to become problematic, so the lens is involved, but not solely.
Jul
29
 revised How many optical aberration types are there in lenses? And what are they?
added 209 characters in body
Jul
29
 comment What do all those cryptic number and letter codes in a lens name mean?
Great stuff! I've noticed that a lot of lens manufacturers explicitly list the lens element features they use. Canon does not explicitly list every detail about their lenses with their feature codes, however it should be noted that they do use special lens elements. Canon lenses do use the following: UD (ultralow dispersion) Glass, Aspherical Lenses, Flourite Lenses, Diffractive Optics. Canon lenses also use advanced milticoating on both the front and internal lens elements. Not really sure why they don't publicize that much, but, there it is.
Jul
29
 comment What photo-sharing websites expose camera serial numbers?
@matt: True, they have 1.6 billion, but they don't search by serial number. If you could search by both content and serial number, you'd have an edge on them. ;P
Jul
29
 revised What do all those cryptic number and letter codes in a lens name mean?
Added Tokina details
Jul
29
 revised What do all those cryptic number and letter codes in a lens name mean?
added 288 characters in body; added 13 characters in body
Jul
29
 revised What do all those cryptic number and letter codes in a lens name mean?
Added Tamron Details. Updated off-brands with compatible camera body brands.
Jul
29
 revised What are your preferred filters for certain subjects?
edited body
Jul
29
 comment How do you optimally resize and sharpen images for printing?
Regarding the native resolution...I have heard it is 600ppi for Canon printers, and 720ppi for Epson. However, I have been unable to verify that one way or another, and the specified resolution of 4800x2400 dpi means little to nothing as far as I can tell. Is the native resolution 300ppi or 600ppi?
Jul
29
 comment How do you optimally resize and sharpen images for printing?
I know the ICC profiles are used for color...I just wanted to make it clear that I am printing with proper color management, so people didn't throw out answers involving ICM.
Jul
29
 comment What photo-sharing websites expose camera serial numbers?
@nik: True, you would be at the mercy of whatever is uploaded... Its too bad that workflows in most tools, like Photoshop, Lightroom, etc. do not preserve tag data across saves and modifications.
Jul
29
 asked How do you optimally resize and sharpen images for printing?
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