Superior 60 minutes timer On the internet by way of Any Electronics Co., Ltd.
The company specializes in delivering electronic solutions which include 60 minutes timer, programmable timers, programmable digital timers, proximity switches, inductive linear sensors, photo-electronic switches, optical screen sensors, strong state relay, and switch energy supply, among others. The client friendly site aims to provide outstanding good quality at cost-effective costs to service seekers across the globe.
Located in China?¡¥s Liushi, Any Electronics is usually a business that prides itself on consistently adapting to technological development. The firm gives solutions in machinery manufacturing, motor technique control, distribution transmission, control device, oil and mining, automation business, solar handle, lighting manage and other such places. The business also supplies new product improvement and OEM solutions. All solutions presented are strictly in line with ISO9002.
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I've seen many night photos with a caption that says something like, 5 minutes exposure time, or 2 minutes, or 60 minutes, you get my point. My question is, what does that all mean? How do you set the exposure to a certain duration of time? Thanks in advance.
And got the following answer:
The longest night exposure I've made to date is 30 seconds. The exposure times you're mentioning are probably for star trails or perhaps a landscape lit by a full moon. First and foremost you'll need a tripod and a locking remote release (we could suggest a remote IF we knew what camera you have). However, for exposures of 30 seconds or less you could use your camera's self-timer. Second, for exposures longer than 30 seconds you'll have to place your shutter speed dial in the "B" (Bulb) position which will allow you to keep the shutter open as long as you want with the locking remote release. Third, you'll need to turn the AF on lens and camera to "OFF" because the camera won't be able to focus on a dark scene. Fourth, you'll need to check in the Owner's Manual for any precautions when making long exposures. Digital sensors heat up during long exposures. You'll also want to check for LNR - Long Exposure Noise Reduction. Star Trails: http://www.danheller.com/star-trails True astrophotography requires very expensive equipment but here are two methods for determining exposure time that (supposedly) prevent star trails. "500 Rule" http://www.davidkinghamphotography.com/blog/2012/11/how-to-avoid-star-trails This is just simple division. Divide 500 by the focal length of your lens and round that down and then divide it by the crop factor of your camera. EX. 1: Sony, Pentax, Nikon with 1.5 crop factor. 500/18 = 27.7. Round down to 27. 27/1.5 = 18. So 18 seconds is your exposure time. EX 2: Canon, 1.6 crop factor. 500/18 = 27.7, Round down to 27. 27/1.6 = 16.8. Round down to 16. So 16 seconds is your exposure time. http://600rule.com Robert Howell Photography Same principle except using 600. EX 1: Sony, Pentax, Nikon. 600/18 = 33.3. Round down to 33. 33/1.5 = 22. So 22 seconds is your exposure time. EX 2: Canon. 600/18 = 33.3. Round down to 33. 33/1.6 = 20.6. Round down to 20. 20/1.6 = 12.5. Round down to 12. So 12 seconds is your exposure time. Here is where some experimentation is needed. I thoroughly read over both sites and didn't see any mention of ISO or Aperture to use. So if you're using the 18mm end of your zoom at f3.5 I'd say try ISO 800 and choose which "Rule" you prefer - 500 or 600. If your images are too dark at ISO 800 go to 1600. As I said, you'll have to experiment. I also use and recommend this site for low-light exposures: http://www.calculator.org/exposure.aspx I used ISO 200 and the Scene 'Distant view of city skyline or floodlit buildings' for these. http://www.flickr.com/photos/drifter45h/4048051455/ 100mm @ f11, exposure of 30 seconds. http://www.flickr.com/photos/drifter45h/4048796836/ 200mm @ f11, exposure of 30 seconds.
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