math guy

Lives in United States PA, United States
Works as a Teacher
Joined on Dec 24, 2009

math guy's recent activity

  • Wow - those are beautiful photos of a beautiful place! I would say your new location has definitely inspired your photography.
  • I understand why some people prefer that method, but I like the simplicity of having it all in LR. And when I want to compare two different versions, I just create a virtual copy.
  • Thanks, guys. I must be remembering wrong. Maybe it was other presets I was using, not the ones from Nik. Opening as a separate TIFF is not nearly as convenient as what I used to do. Besides being ...
  • Created question thread Nik collection in Lightroom CC
    When Google made the Nik Collection free (earlier this year, I think), I installed it in Lightroom and it worked great. But when I went from the stand-alone version of LR to the Creative Cloud ...
  • I have no experience with it personally. But when review after review mentions the same problem, I tend to believe them. I know CA can be removed in Lightroom, but I don't really want to fight ...
  • Created discussion thread compact travel chargers
    When I got my K-3 and K-50, one thing I didn’t like was the bulk of the battery chargers. And when I bought a generic backup battery for the K-3, it came with a nice travel charger. Very small ...
  • Just a quick update. I got the Sigma 10-20 f/3.5 and am happy with the choice. I gave it a workout at some of the Smithsonian museums in Washington DC last week, and it performed as well as I ...
  • Very sad to hear this news. Ron was probably the most helpful person on this forum. I will definitely miss him.
  • Based on the samples and comments in this thread, I was leaning toward the 12-24. Having decided on a rectilinear zoom made it easier to compare: (1) I eliminated the Tamron 10-24 based on the ...
  • Replied in Thanks, Barry!
    That helps a lot to see it that way. Thanks. That's the way I'm leaning right now, but gosh I love the form factor of that 10-17. I think my question about IQ has been answered, though. Thanks ...
  • Lightroom is what I use, also, so it sounds like this wouldn't be much of an issue for me, either. I've read a little about that, but since I don't own a fisheye I've never been able to try it out. ...
  • Maybe I'm using the "ultra" incorrectly? I was referring to anything that went wider than 15mm to be UWA. I've never heard anything but praise for the 8-16 from its owners. Any idea why Sigma ...
  • Thanks, Barry. That second one is especially nice -- very crisp. You mentioned CA... is that primarily in situations where it would be expected such as harsh contrasts, or does it show up in less ...
  • Thanks for those examples - very helpful!
  • Thanks - that's a great article. One thing that really stood out to me in the image comparisons was the superiority of the 10-17's color and flare resistance. I was expecting the Rokinon 8mm to at ...
  • Created question thread looking into UWA zooms
    My favorite landscape lens is the 21 Ltd, both for size and contrast. However, my last few vacations have gotten me thinking that I might want to add an ultra-wide zoom to complement it, as I ...
  • I agree. That would great to be able to eliminate the ND filter from the mix.
  • I wouldn't have any problem with negatives. It's either negatives (with logarithmic ISO) or fractions (with linear ISO) whenever you get below an arbitrarily-assigned "base" ISO. When I got into ...
  • Even easier would be using base-2 logs since each stop multiplies or divides the amount of light by two. Using the formula log2(ISO/100), we get the following: 100 > 0.0 200 > 1.0 400 > 2.0 800 > 3.0 ...
  • One worth considering is the Tamron 70-200 f/2.8. Good wide open, and crazy good at f/4. Pleasant bokeh. The common knock on it is AF speed. But I use it to shoot kids sports, so I reckon you'd be ...
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Total messages 2426
Threads started 99
Last post 1 week ago
Total comments 0
Total likes 0
Total reviews 0
Entries 25
Votes cast 151
Last entry Jan 31, 2012
Photos uploaded 437
Last upload Mar 30, 2010