Dr JLW

Lives in United States New England, United States
Works as a Engr
Joined on Dec 2, 2003

Dr JLW's recent activity

  • I use fast lenses in low light fast shutter speed means I don't have to haul a tripod or monopod to get these shots, often in places that do not allow these.  I do it without spending a small ...
  • Most Western cell phones do not work in Japan.  They use a different carrier system from teh US and EU.  Yours may differ, but check. We rented a pocket wifi and tethered to it.  You can get it ...
  • In depth of field yes, in exposure no, important for manual non stabilized lens.
  • Nah,  the Angeniieux 35-70  is f/2.5 to about f/2.8 and with reducer ~f/1.7 to f/2.0.
  • Yes there are more FF lens options but I like to use legacy fast optics and focal reducers make them a stop faster and have gotten fabulous IQ from high end but old lenses. My Angeniuex 35 70 has ...
  • It is a bit close to departure date but had an outfit called "Inside Japan" set us up for self guided expeditions, travel arrangements and guides. They were terrific. Tokyo and Kyoto are huge with ...
  • Thanks for your kind words. By far the most significant issue on cruises and other large groups of tourists is "shot hogging"  Some self acclaimed photographic genius gets into the prime spot and ...
  • I have taken several river cruises and never seen an issue but sense and consideration are the keys. I only directly photograph passengers and crew when something sanctioned is going on like a ...
  • The question was worth anything whatsoever and it is clear that they are not worth much money. Gifts are a good idea but they may have worth in other ways. You might keep on in your car if you ...
  • UNless you have done a few you can figure that your chances of a successful repair are about 1 in 5 so you do this mostly as an exercise i seeing what is inside the camera. Often a web search will ...
  • Are there still wild horses there?
  • Yes I get all of that but for the me the question is why would I want to carry semi professional equipment around, except to play around with it. For most of what I do there is no reason for pro ...
  • The SD card is not much of an issue. If I were in a very sketchy area I might alternate SD cards as a bit of protection against loss of the camera, but I'd probably just not go places where this ...
  • Probably an outrageous cheat, but since this is the adapted lens area and this thread has nothing to do with adapted lenses; if you want to carry a lot of capability in a small package how about a ...
  • Replied in panorama
    I would not have thought that even a foot or so of motion for a scene whose closest point is ten feet away is not going to be a serious issue, although I have been surprised at how much difference ...
  • Replied in panorama
    Swinging about the nodal point has the benefit that the image on the focal plane does not move.  This is essential for film.  Getting this situation gets sharp negative. It is not essential for a ...
  • Replied in panorama
    I find that for most scenes outdoors or with lots of light handholding usually works but for some scenes like at teh Colosseum in Rome I could not get a free of large stitch errors unless I used a ...
  • Replied in Yes
    Leonard's equation is the right one to use but the relationship, using his notation, that define minimum focus distance is Dm the movement distance. Replace Di with f+Dm and solve for Do and you ...
  • Replied in panorama
    As several others noted the classic pivot point for sweep panoramas is the lens unit or nodal point.  that is what panoramic cameras did from about the 1900 thru the the 1990's. However, that is ...
  • Thanks, I have admired Zeiss Sonnars.  I have v few Opton Sonnars and I suspect they would have similar performance. As I understand it the Sonnar design was oriented to reduce glass to air ...
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Last review Mar 14, 2012
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