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From: Peter on 8 Jun 2010 09:52 "Pete" <available.on.request(a)aserver.invalid> wrote in message news:2010060812300565633-availableonrequest(a)aserverinvalid... > Tell me about it! I enjoy taking photos during twilight. I can't find > information about light levels for my region so I have to guess when to > set out on a trip. During most of the year I end up getting too cold > before I've finished the shoot. I've had three successful trips during the > last 12 months - I've learnt a lot and want to use that knowledge to take > better shots in the future. IMHO Pre sunrise and twolight are the best times. the difference being that in the morning the light gets worse, after prime, whatever that is. >> Ever hear of "The Land of the Midnight Sun"? > > Yes. For me, it would be very difficult to both get there and survive > there, but I'd love to go. Did that last summer. The running joke there is teenagers say to their parents: "don't worry, I'll be home before dark." -- Peter
From: Pete on 8 Jun 2010 10:23 On 2010-06-08 13:48:04 +0100, David J Taylor said: > "Pete" <available.on.request(a)aserver.invalid> wrote in message > news:2010060812300565633-availableonrequest(a)aserverinvalid... > [] >> If you know of any software that would show me the twilight times, I'd >> really appreciate it. > > My WXtrack includes all five definitions of sunrise/sunset: > > http://www.satsignal.eu/software/wxtrack.htm > > Use the View, Sunrise & Sunset menu. > > >>> Ever hear of "The Land of the Midnight Sun"? >> >> Yes. For me, it would be very difficult to both get there and survive >> there, but I'd love to go. > > If you prefer the Winter nights: > > http://www.satsignal.eu/Hols/2010/NorthernNorway/index.html Thanks very much indeed, David. I will try your WXtrack. As for holidays, my current project is to get myself fit enough to travel more than the 30 or 40 miles I can do at the moment. You have helped me to "Think Big." Cheers, Pete
From: George Kerby on 8 Jun 2010 10:27 On 6/7/10 8:50 PM, in article 87k0e7-bva.ln1(a)ID-52418.user.berlin.de, "Wolfgang Weisselberg" <ozcvgtt02(a)sneakemail.com> wrote: > George Kerby <ghost_topper(a)hotmail.com> wrote: >> On 6/5/10 7:20 AM, in article 62spd7-tk3.ln1(a)ID-52418.user.berlin.de, > >>> You can't see the stars during the day anyway. > >> Almost right: Only one. > > The sun is a star, but is not part of the collective "the stars" > for the viewing location Earth. > That's like asking if infinity is farther than the moonies. Nice try!
From: DanP on 8 Jun 2010 11:45 On 8 June, 02:53, Wolfgang Weisselberg <ozcvgt...(a)sneakemail.com> wrote: > DanP <dan.pe...(a)hotmail.com> wrote: > >> I guess you could do a thought experiment. > >> If 2 lenses gather the same amount of parallel rays along > >> their lens axis, they must have the same diameter. Go from > >> there. > > Right, at maximum lens aperture bigger lenses gather more light. > > Close the bigger lenses aperture to match the small ones and you get > > the same amount of light. > > Please clarify, what exactly do you mean "to match the small > ones"? f/stop? Diameter? Area? What exactly? > > -Wolfgang f/stop. Big lens: 42mm diameter, 50mm focal length, f/1.2 aperture. Small lens: 18mm diameter, 50mm focal length, f/2.8 aperture. Set them both to f/2.8 or smaller and you get the same light. DanP
From: David J Taylor on 8 Jun 2010 12:52
"Pete" <available.on.request(a)aserver.invalid> wrote in message news:2010060815232998946-availableonrequest(a)aserverinvalid... [] > Thanks very much indeed, David. > > I will try your WXtrack. > > As for holidays, my current project is to get myself fit enough to > travel more than the 30 or 40 miles I can do at the moment. You have > helped me to "Think Big." The great thing about many ships today is that they are well equipped for disabled folk - wheelchair access, lifts etc. etc. Not saying you have that problem, but just for others to know. Cheers, David |