Time to be with your loved ones

Time to be with loved ones

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51,858 reputation
799235
bio website jonrista.com
location Aurora, CO
age 34
visits member for 3 years, 9 months
seen 13 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

Feb
17
comment Why is my P&S camera producing photos with a wrong exposure and a screen-like striping?
Well, aside from the problem, this would make one hell of a great camera for Halloween! :P These are some creepy photos!
Feb
17
answered What is the use of printer profiles when softproofing?
Feb
16
comment How can I compare MTF50 to a manufacturer's MTF chart?
@Bob: I'm not sure what your asking about. Without knowing EXACT specifications for OLPF, CFA, microlensing, etc. you can't exactly know the blur of a sensor. I'm just roughly computing what I suspect they are based on their pixel pitch. For example, a 1D X has 6.95µm pixels. Assuming the sensor was monochrome, that would effectively be the sensors blur. Since the 1D X has a CFA with RGB filters, with R and B twice as sparse as G, you have to assume that your losing a certain amount of spatial resolution...hence 68%. 0.00695 * 1.32 (the 1.32 is 1 + (1-0.68)) is 0.009174...a 9.174µm blur.
Feb
12
comment DIY Vignette Measuring
Well lit and evenly lit are very different things. The only way you can really guarantee your test surface doesn't have uneven lighting is to completely control the lighting...
Feb
8
awarded  Notable Question
Feb
3
comment Why are some of my photos coming out almost completely purple?
Looks like you guys got it taken care of.
Feb
3
revised How do I get started in Astrophotography?
Fixed broken url
Feb
2
comment What does a dynamic range difference of 2.7 EV really represent?
I wouldn't say that. Two stops DR is two stops DR. That's a lot. I just don't like how DXO mucks up the works with a completely fake number like Print DR. It's annoying.
Feb
2
comment Any way to make Lightroom apply grain and sharpness after export/resize?
Wny not create a virtual copy of your images, crop them in LR, then apply grain/sharpening to the crops, and simply export the crops directly (rather than cropping after the fact)?
Feb
2
comment What does a dynamic range difference of 2.7 EV really represent?
Actually, DXO's Print DR is even worse than I said. It isn't even measured, it is extrapolated. Print DR, according to DXO, is derived as so: DR<norm> = DR + log<2> sqrt(N/N<0>). Print DR is a logarithmic extrapolation of native resolution over normalized resolution, from the base DR (Screen DR). DXO doesn't even MEASURE their own primary DR that they use to "score" their cameras. It's just a simple extrapolation...so the notion of 14.2 or 14.4 stops of DR isn't even real. In an 8-bit downsampled JPEG image, DXO literally COULDN'T 'measure' 14 stops of DR.
Feb
1
comment What does a dynamic range difference of 2.7 EV really represent?
Yup. Another reason why I probably won't ever use anything other than Canon. So much more versatile. (Although, in the long run, I'll probably be using dedicated peltier-cooled monochrome astro cams for astrophotography...) I am still not sure I would call bias clipping "NR", though. It is simply clipping negative analog signal...which really isn't noise reduction. Correlated Double Sampling is true hardware NR, however everyone does that these days, so it isn't fair to say only Nikon does "hardware NR".
Feb
1
comment What does a dynamic range difference of 2.7 EV really represent?
D800, D600. Roughly the same difference in DR. I have the 5D III and D800 DXO DR numbers memorized, though...so it was just easier to use the D800. :P
Feb
1
answered What does a dynamic range difference of 2.7 EV really represent?
Feb
1
comment What does a dynamic range difference of 2.7 EV really represent?
...reduces it at the hardware level (via any number of fabrication techniques to produce less noise from high frequency components, lower frequency readout, greater parallelism, etc.) they will continue to have less DR than the competition. On a side note, because of the fact that Canon does NOT clip negative signal values, they are much better suited to astrophotography. With astro, you usually generate dark and bias offset frames, which are then subtracted from the light frames (image signal) to nearly eliminate read noise. Because Nikon clips, they aren't as good for astro work.
Feb
1
comment What does a dynamic range difference of 2.7 EV really represent?
Michael is correct, however, about DxO, and how they have full details about Nikon demosaicing. At least, Nikon and DxO have a partnership, Canon and DxO do not. Canon publishes their demosaicing algorithms, however there is no evidence that DxO utilizes them. If you ever use DxO's software, you'll quickly learn that they deal with Canon CR2 files TERRIBLY compared to other products, like DPP, LR, C1, RT, etc. That said, Canon cameras DO have more read noise, and that is their fundamental problem. With debanding, you can recover a lot of DR lost with Canon cameras, but until Canon...
Feb
1
comment What does a dynamic range difference of 2.7 EV really represent?
Actually, Nikon sensors don't so much as do any more noise reduction on chip than Canon sensor's do. Both do CDS, or correlated double sampling. The difference is where and how CDS is performed. Sony Exmor sensors use a digital readout and digital CDS, vs. Canon's analog CDS. The other major difference with Nikon cameras is they clip negative signal information, and therefor have no bias offset. Clipping could be considered a form of noise reduction, but it is also throwing away potentially good image info that could be recovered if you had the ability to remove read noise.
Jan
30
awarded  Necromancer
Jan
30
awarded  color
Jan
26
answered sharpen blurred photo
Jan
24
awarded  Nice Answer