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peter_langfelder

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  1. I skimmed the paper. They solve a problem of correcting the spherical aberration caused by the first surface of a lens by the second surface, for imaging a single dot. The first surface can be arbitrary, e.g. a wavy form but cannot induce ray crossing within the lens. This seems to be very different from optical lens design where the object and image is not just one point but a (usually planar) surface; and the first surface of a lens is not arbitrary (and certainly not wavy).
  2. I'd try not to get too stand-offish right away (especially not with a supervisor ;)). Try to see why the supervisor wants the raw photos - it could be he's thinking of reprocessing everything using the same style which would make a website look more professional, but does not want to bother you with it. You could offer to do yourself since these are your photos, or try to explain that the style is part of your artistic expression and you don't want the style changed.
  3. Within 3-4 hours you can also get to the Sierra Nevada mountains if you like mountains. Lake Tahoe is great, so is, of course, Yosemite although the waterfalls will be nearly or completely dry. Even Lassen Volcanic National Park is just about 4 hours away. Big Sur, a scenic coastal area, is also under 4 hours.
  4. I gather that you don't want a flash on the camera, even one that you can tilt and swivel to bounce. My suggestion would be to look into 3rd party iTTL-capable radio triggers. I have and use the Yongnuo 622N-tx transmitter (on the camera) to have full iTTL control over off-camera Nikon SB900 (attached to a 622N transceiver) and another Yongnuo flash. A set of a transmitter and 2 transceivers should run about $120 or less. They are not negligibly small but I don't find them so large that the size becomes an issue. The system works fairly well if not completely consistently (and reliability has been a bit of an issue with the Yongnuo products I own). I cannot guarantee they will work with SB-600 but that shouldn't be hard to check on the world wide web.
  5. No need to be overly self-critical, the photos could be improved but they don't look all bad. A few points... The individual portrait is not focused well which could be an issue of camera not focusing very accurately, but it could also be the result of focus-recompose which you would have used. On the 6D the center point is more reliable but focus-recompose has its own pitfalls. I personally shoot Nikon but sometimes encounter the same problem. If you want to be sure of focus and have a stationary subject, use Live View focusing without recomposing. The same photo would likely be more contrasty if you did not shoot straight into the small window behind the man's head. Try not having strong backlight sources in or just outside of the frame; it will do a world of good for contrast. If you can put the window at 90 degrees and have it provide some sidelight, it can give the photo a more 3-dimensional look. The window is also distracting, but that's more about esthetics than technical issues. You may get better sharpness and contrast (assuming focus is accurate) by stopping the lens down a stop (to 5.6). Also, for photos where the depth of field needs to be larger (the gentlemen sitting on the sofas), you may try to stop the lens down to f/8 and increase the ISO. Noise would be higher but the photo would look sharper. HTH, Peter
  6. I assume you double-checked that the camera was not switched to continuous focus... apart from that, cleaning the contacts could not hurt since a dirty contact may have a higher resistance, causing a higher voltage drop which in turn may become a problem when the battery voltage drops some. Of course, you could also have some parasitic resistance somewhere in the camera (e.g., battery contacts) or in the lens and it may only manifest itself with the particular lens (or camera) since the electrical properties of different cameras and different lenses may differ.
  7. I would first try replacing the backup battery unless you have changed it relatively recently. Certainly cheaper than sending the lens for a potentially unneeded repair. A weak backup battery will cause the camera to misbehave in weird ways.
  8. Would it work to sit in the back seat and have the second camera sit next to you?
  9. I thought the OP didn't mean sharing exclusively over the internet? I shared my photos, in print form, by showing and giving them to friends and relatives, long before I started posting them on the internet. I know that friends generally like me to take photos of them/their kids, and part of my motivation to take those photos comes from them liking my photos. If I had no one to show my photos to, I would still take photos, but fewer and of different subjects.
  10. I dropped my D750 off at Nikon service center in Los Angeles, and had it back in about a week (dropped it off on a Friday and got an "it's ready for pickup" call from them next Thursday or so). But different centers may have different wait/work times, and those could vary even for one center depending on demand.
  11. Why don't you post this question on the Wedding and social event forum? I think quite a few of the regulars there are old timers (e.g., Marc Williams), although I am not sure they use (or have used) auto mode.
  12. Perhaps you should post some examples so we can better guess what may have gone wrong. I find the Nikon system a bit confusing at times but fairly reliable. I assume you are aware of the fact that, depending on custom setting e4, ambient exposure compensation may get added to the dialed-in flash exposure compensation. Thus, if you change the ambient EC, you may also be changing the effective flash EC.
  13. <p>FWIW, I don't see a change in angle, I see a slight shift - the 750 image seems rotated slightly to the left. In terms of color, you are viewing the images in Lightroom which applies a (presumably different between D750 and D810) camera profile. Thus, even with all controls zeroed out, the processing is different for different camera models. This is in addition to the sensor differences.</p>
  14. <p>I think this review by Dustin Abbot has a bit of a comparison: <a href="http://www.canonrumors.com/reviews/review-zeiss-milvus-50mm-f1-4-t/">http://www.canonrumors.com/reviews/review-zeiss-milvus-50mm-f1-4-t/</a></p>
  15. Don't worry about it. I think you are seeing Newton rings, although I may be wrong on this.
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