Red and Blue

by Gordon

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56,199 reputation
8114259
bio website jonrista.com
location Aurora, CO
age 35
visits member for 4 years, 10 months
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

Oct
18
accepted Is a “Zone” Large Format Camera with gold plating legit?
Oct
18
revised What's the best number of shots to combine to produce an HDR photo?
added 978 characters in body
Oct
18
answered Is it worth it to have the 50mm f/1.8 Canon lens?
Oct
18
comment Is there always a way to capture all the light ranges to get good HDR images?
I guess another important point to make (Matt already made it, but to be clearer) is that the vast majority of "HDR" images are indeed NOT high dynamic range images...they are simply LDR images that have been tone-mapped from HDR images. That doesn't mitigate the benefits of using the alternative and simpler Exposure Fusion process to create improved LDR images, though. It just means that the final results of any process are all ultimately LDR images that can be viewed on the limited gamut's of computer screens and prints.
Oct
18
comment Is there always a way to capture all the light ranges to get good HDR images?
@Matt: I would dispute the fact that discussing the differences is irrelevant. In my experience, enfused images look a hell of a lot better than LDR images tone-maped from HDR images, even after hours of meticulous tweaking of tone curves or exposure settings. It is possible to create a superb image with exposure fusion with hardly any effort, while it takes a lot of careful effort to create a truly superb image with HDR & tone mapping. In that respect, I think the process differences are very important, and very relevant.
Oct
18
comment How do I generate high quality prints with an ink jet printer?
@labnut re Jobs & iPhone: I have several co-workers who have the new iPhone 4. I must say, it really is the most amazing screen I have ever seen. I've spent quite a bit of time trying to see any individual pixels, and so far, I've failed. I would quite honestly die to have a 30" computer screen with th this density. One thing I've learned, I think, is that visual acuity with emissive dots is a bit different (lower?) than with absorptive dots. I've closely scrutinized the iPhone and never seen a dot, however I can see dots when I closely scrutinize a print. Complex stuff, for sure.
Oct
18
comment How do I generate high quality prints with an ink jet printer?
Despite all the theory and mathematics behind printing, there is a very simple fact about detail in a print that pretty much blows it all out of the water. If you hand someone a 300ppi print, they will think its wonderful and amazingly detailed. They will think the same thing if you hand them a 600ppi print instead. Show them a 600ppi print one day, and a 300ppi version the next, and they normally won't notice any differences (there are exceptions to that, but few). It is only when someone sees both prints side by side are they able to consciously notice the improvement of a 600ppi print. ;-)
Oct
18
comment How do I generate high quality prints with an ink jet printer?
@labnut: Indeed, visual acuity is dependent on age. There is an ideal point during childhood where it is at its highest, after which it degrades. As you stated, though, one arcminute is the population average, and it is the correct value for the majority of adults. As I've done more tests, I've noticed my own visual acuity is actually better than I figured on, and I print most things from 8x10 and lower at 600ppi unless I know for a fact there isn't enough fine detail for it to matter. I've watched people over time as well, and noticed how frequently people move closer for a better view.
Oct
18
comment How can I get the shutter actuation count for Canon EOS 500D/550D?
Sadly, it looks like that EOSInfo tool has not been updated since the 450D. It has the 500D listed, but highlighted in red and crossed out. :( I too would be interested in knowing if there is a good way of figuring out how many true shutter actuations there have been on any Canon body.
Oct
18
awarded  Nice Answer
Oct
18
comment Is there always a way to capture all the light ranges to get good HDR images?
You can read more about the specifics at this link: tawbaware.com/tufuse.htm. There is a link to the original paper on Exposure Fusion in there as well, which describes the theory and algorithm in depth.
Oct
18
comment Is there always a way to capture all the light ranges to get good HDR images?
Exposure Fusion is an entirely new way of merging images. Outside of the need for multiple exposures, the similarities stop there. HDR merges images into a 32bit floating point high dynamic range image, while exposure fusion selectively chooses tones from your image set and merges them into a normal 8bit image via a special algorithm. Photomatix supports both HDR and Exposure Fusion, but they are not the same thing...an enfused image is not HDR, its LDR.
Oct
18
comment Is there always a way to capture all the light ranges to get good HDR images?
The tonal range of an 8-bit image is about 256 levels. The tonal range of a 12-bit RAW is about 4096, 14-bit RAW is 16385, 16-bit RAW is 65536 discreet tonal levels. In contrast, a 32bit float HDR image supports truly "dynamic" tonal range. Since there is one 32bit floating point number for each color component, you are not limited to representing color brightness with discreet integer values. The HDR tonal range extends from pitch black (0.0), through dim starlight (0.00001), indoor lighting (100), outdoor shade (1000-10000), outdoor sunlight (1000000), the sun (1000000000) and beyond.
Oct
18
comment Is there always a way to capture all the light ranges to get good HDR images?
Well, were not really talking colors, were talking tones. The number of "colors" that are representable by any color model, for 8bit, 16bit, or 32bit float, is about the same. There are two major modes of thought, but science shows that humans can only really see about 2-3 million (by one school of thought) to about 10 million (by another school of thought). On the other hand, the human eye is far more sensitive to different tones. It is not infinitely sensitive, but we are able to differentiate a pretty fine degree of tonal differences. HDR expands tonal range much more than color.
Oct
18
comment Where can I find comparisons for linear polarizers (for a cheap variable ND filter)?
I thought the problems with linear polarizers had to do with the meter, and whether it was beam splitting. From what I understand, beam-splitting meters also polarize the light, which would double-polarize if you used a linear polarizer, and give you incorrect meter readings.
Oct
18
answered Is there always a way to capture all the light ranges to get good HDR images?
Oct
17
comment Any good alternatives to Lightroom for PC users?
Sorry, Paint.NET is an ok image editing program, but not really tool to do any kind of photography work with. It doesn't offer any kind of organizing/tagging, and outside of some very basic editing tools, does not really provide anything to effectively fine-tune and fix photographs (outside of its curves tool.)
Oct
17
answered Any good alternatives to Lightroom for PC users?
Oct
17
comment How do I generate high quality prints with an ink jet printer?
@labnut: I've actually done some tests, which will be the basis of the next Emperical Study. For certain types of photos, where fine detail is prevalent, 600ppi (or 720ppi on Epsons) does indeed matter. The moth used in the Extreme Upscaling study has some very fine detail in its eyes. Printing @ 300ppi vs. 600ppi shows a marked difference in the clarity of those details. On the flip side, if your photograph does not have such details, 300ppi is generally plenty.
Oct
17
awarded  Nice Question