Lightnings taking a ride

by ceinmart

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56,975 reputation
8117263
bio website jonrista.com
location Aurora, CO
age 35
visits member for 5 years, 1 month
seen 2 days 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

May
27
awarded  Nice Answer
May
23
comment Why is a physical anti-aliasing filter still needed on modern DSLRs?
Digital film would not suffer from aliasing as we experience it today, and it could potentially provide both extremely high resolution in good light, or extremely high sensitivity in low light, and dynamically adapt between the two as needed. Brilliant design...not sure if/when it may actually find it's way into an actual camera though...
May
23
comment Why is a physical anti-aliasing filter still needed on modern DSLRs?
Fuji has always been one to try out non-conventional pixel layouts. They have had some success, but in the end, the classic bayer matrix still seems to win out in the end. There are some patents out there for a dynamic "digital film", which uses extremely small binary pixels and high frequency sensor readout for a sensor that behaves more like the grains of silver halide in film than pixels on a sensor. The "jots" are basically photon counters, and can combine together to create larger "grains". Each of these is read out thousands of times a second, and reconstructed into an image.
May
23
comment Why is a physical anti-aliasing filter still needed on modern DSLRs?
I think a random distribution of pixels on the sensor would certainly be a solution to aliasing...the trick would be combining all that data into a usable image on a computer. It would require some interesting algorithms to sample and reconstruct the data in a standard RGB pixel matrix. I wonder if doing so would reintroduce some aliasing as well... Reading out neat little rows and columns is super easy for computers, which is why its done that way. Random data is actually something computers don't handle well.
May
16
comment How can I adjust the colour temperature of an image programmatically?
I am curious how one can perform white balance like it is done with Lightroom, where you have a color temperature as well as color tint. Those two sliders align perfectly with the two planar Lab space axes, as well as with CIE-based white point adjustment formula that can be found online. Is it possible to control color temperature and tint separately with this kind of simplicity? Is that just some other calculation to determine the R_gain and B_gain?
May
16
comment How can I adjust the colour temperature of an image programmatically?
I was going to say you should put that into an answer, but I see you already did. Thanks for the insights, though! I was unaware this could be done so simply.
May
5
comment Are there cameras that autofocus during an exposure?
Try shifting focus during an exposure. See what happens. I don't think that would work. Not with short exposures. Some people have used it as a means of creating an effect, however that is usually with longer exposures, and after the focus shift has been made, the camera is left still for a moment before the shutter closes. For a constantly moving subject, I think you'll find that the entire image is just blurry in one way or another.
May
4
answered What are the exact pixel values (or ranges) for shadows/midtones/highlights in Lightroom?
May
4
comment Are there cameras that autofocus during an exposure?
Are you looking to focus during a single exposure? Or looking to focus during video, or multiple exposures? Changing focus during a long exposure is sure to result in a totally blurred image. Tracking focus during an ongoing, long exposure doesn't have any real value. As for focusing during say video...Canon has DPAF which will do that, and other manufacturers have similar things (although usually done with CDAF).
May
4
awarded  Good Answer
May
3
awarded  Necromancer
Apr
27
comment Why should I use the widest aperture for star photography?
With modern DSLRs, pixel sizes are small enough that to actually avoid trailing at the pixel level (vs. at the downsized for web magnification level), you need to be using 8-10 second exposures. That's much too short to really get much of your signal above the read noise floor. As such, I think it's best to use a Polarie or SkyTracker (or, for that matter, an AstroTrac, although that is more expensive) even when using a 14/16/20mm lens. You can then be assured that you will have round stars that are easier to align and stack, and you'll actually be able to stack.
Apr
27
comment Why should I use the widest aperture for star photography?
There is no need to spend thousands on exotic tracking mounts. You can spend about $400 on something like a Polarie or SkyTracker, which is actually what I would recommend for someone using fast primes on a DSLR. I then also VERY strongly recommend using a tighter aperture. I know quite a few milky way imagers who use the iOptron SkyTracker. They will track most of their shots, and usually landscape aspects will blur. Then they will grab a few static shots to stack for the foreground, and a bit of manual blending corrects the interface of ground and sky. Absolutely no need to spend thousands.
Apr
24
comment When does “Fill the frame” become “Too tightly framed”?
I agree with Matt here, I don't think this is an opinion-based type question. I think it is a legitimate question that plays a key role in choosing the right kind of composition for images.
Apr
24
comment Why should I use the widest aperture for star photography?
That is a difference of 4-7 orders of magnitude difference in light levels. The reason you would use a faster aperture is to get more light, not use a shorter exposure. The only caveat to that might be if you are imaging in a heavily light polluted area, in which case you might be limited to exposing for 2-3 minutes at f/4, 30s-90s at f/2.8. However in a light polluted area, you should be using a filter like the IDAS LPS-P2 or -D1 to block some of it.
Apr
24
comment Why should I use the widest aperture for star photography?
I wouldn't apply the "larger aperture allows for faster shutter speed" when it comes to astrophotography. That is daytime terrestrial photography thinking there, and it doesn't really apply to astrophotography. You need long exposures in astro, LONG exposures, so a faster aperture just means for whatever maximum exposure time you can handle, you get more light. You generally wouldn't want to reduce exposure when moving to a faster aperture, because you aren't getting enough light to start with. In astro, you work with around 0.002-0.005 lux, whereas most daytime photography is 500-100,000 lux!
Apr
24
comment Why should I use the widest aperture for star photography?
Glad to be of service. :) Astrophotography has become my obsession these days...learned a lot from years ago when I was just poking around with it.
Apr
22
answered Why should I use the widest aperture for star photography?
Apr
12
revised How can I calculate what the effect of an extension tube will be?
deleted 195 characters in body
Apr
5
awarded  Popular Question