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  1. O

    Is there something I don't know about?

    I agree entirely. I am amazed at how fast even my 16 yo Hyundai Lantra starts...probably within a second...no...easily. I have a workshop charger that can get a car started witgh 5 miinutes' charge of a "flat"battery....just a few AH. It is still an issue though. Also if the battery is more...
  2. O

    Is there something I don't know about?

    Yeah that's about what I figured. That is a pretty gross exaggeration. What triggered my seeing this was an ad on TV showing a similar thing being used to start a car with a "flat battery". I guess you_may_ get away with it if the car started in about 1 second flat, but IMO there is a reason...
  3. O

    Is there something I don't know about?

    Yeah but I can't see this using 3400-3500 mAH cells, which arre pretty high end stuff! Also the claimed battery weight is 470gm. I have 18650s that weigh 45 gm each and are 2500 mAH. The Panasonic NCR18650B weighs 45gm also and _is_ 3400 mAH. But 18 * 45 =....850-ish gm, so nearly twice this...
  4. O

    Is there something I don't know about?

    Or is this about them most blatant exag...lie, even in the world of leds and flashlights? http://www.ebay.com.au/itm/261960667568
  5. O

    Easy to Understand Lumens Vs Lux Explanation

    Re: Integrating sphereLux to lumens, final conversion confusion 5 characters
  6. O

    Easy to Understand Lumens Vs Lux Explanation

    Integrating sphereLux to lumens, final conversion confusion So you get an integrating sphere as described elsewhere on these forums. You make sure you surce cannot directkly strike the meter sensor. The whole idea is to make the light source as diffuse as possible. You measure the lux. Then...
  7. O

    Beamshots of many lights. Picture heavy

    Sorry guy. Appreciate it. Let's know. ABSOLUTELY no crit intended. Full of praise. Seriously. Nick (the old)
  8. O

    Beamshots of many lights. Picture heavy

    OK. Try again Server too busy. I guess my question is: Which of those exposures did you feel best represented what you could actually see when looking at the scene? I am happy to work at F5.6 or whatever. Many of the comparisons I have seen and dealt were between more similar stuff, but I...
  9. O

    Beamshots of many lights. Picture heavy

    Thanks for following up. My main interest is to show the difference in brightness between two lights. If one is so bright that is saturates everything at 50 metres at our standard settings, then it needs reconsidering, as a different kettle of fish. I guess my question is, regarding your...
  10. O

    Beamshots of many lights. Picture heavy

    Colour response of the filter itself _should_ be taken care of by the electronics of fhe camera. They will vary, and you can set _that_ in many cameras, along with saturation etc. To add to this most cameras come from the shop with (often puzzlingly) pre-set non-neutral settings. This would...
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    Beamshots of many lights. Picture heavy

    iced_theatre, I salute you. I have been talking, You have acted and created a result based on a standard....it happens to match closely to what I was asking :) You are then brave enough to admit you need to learn cameras. Is Moonrise's stuff helping? BTW. 3am! I again salute you! :) OK...
  12. O

    Beamshots of many lights. Picture heavy

    I have been beating a drum about all this, just in the last week, on another thread! I applaud the idea of the cards. I suggested side by side at a standard distance, but this idea has a lot more merit. Maybe a combo, to give beam sprread? I also liked the fact that you went to the trouble to...
  13. O

    Comparing photos

    But I have had two posters (well, me and one other) both saying their shot portrayed "what they saw" .......with 6 f-stops of exposure difference between them. Different lights. Different targets, but basically two LED lights, both in the multi-watt range and above 100 Lm each, with similar...
  14. O

    Comparing photos

    Lumens seem to be the unit of choice, for all their possible faults. However, a Lumen does not help measure how bright a beam you get from a torch. You need to know how small an area the beam covers as well. And _there_ you get problems. beam degrees vary widely fro claimed figures, to th...
  15. O

    Comparing photos

    I am starting to feel like the Light Police here.:rant: There was a thread that tried to address the problems of lack of uniformity, but it died months ago AFAICS, and there is a Poll/thread about photo methods. I am happy to see outside shots, simply showing the view. But isn't comparison...
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    Beamshots - How are you doing yours?

    See my other post. Unless the lights are _really_ different, the eye iris will not change that much. Not as much, in my opinion, as the brain itself and what it interprets _for the same light setup_ shown to two people! While we may need overexposed shots to get a good idea of how the beam...
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    Beamshots - How are you doing yours?

    Surely some agreed figure is better than purely subjective opinion of what is "real" when comparing lights that are not as different as a 100Watt spotty to a LED torch? If we are comparing power LED torches, or even HID lights with LEDs, if we know the claimed Lm, and the angle of the beam...
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    Beamshots - How are you doing yours?

    I read the thread, which is unfortunately a bit olkd to start posting to, I thought. (??) However I am interested in this, as I have just started to try to use beam shots, for comparison. I immediately came up against standardisation problems; what camera settings do you use if manual? I...
  19. O

    Comparing photos

    I was wondering if you guys has a set of rules for photographing lights. Targets, distances, camera settings. I see this as being used when comparing photos posted on the web. Thanks for any help
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