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#21
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*chuckle* People actually *have* asked me about flash for photographing an
eclipse! -- Clear skies, Michael A. Covington Author, Astrophotography for the Amateur www.covingtoninnovations.com/astromenu.html |
#22
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*chuckle* People actually *have* asked me about flash for photographing an
eclipse! -- Clear skies, Michael A. Covington Author, Astrophotography for the Amateur www.covingtoninnovations.com/astromenu.html |
#23
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In article , Alan Browne
writes William Graham wrote: Unless you've got a flash with a guide number of 250 thousand miles........ That would require an f/1 lens for ISO 100. If the lens is f/4 then a GN of 1,000,000 miles would be required... Don't forget the flash would have to fire about 2.69s before the shutter is fully open. -- Ian G8ILZ |
#24
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In article , Alan Browne
writes William Graham wrote: Unless you've got a flash with a guide number of 250 thousand miles........ That would require an f/1 lens for ISO 100. If the lens is f/4 then a GN of 1,000,000 miles would be required... Don't forget the flash would have to fire about 2.69s before the shutter is fully open. -- Ian G8ILZ |
#25
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In article , Alan Browne
writes William Graham wrote: Unless you've got a flash with a guide number of 250 thousand miles........ That would require an f/1 lens for ISO 100. If the lens is f/4 then a GN of 1,000,000 miles would be required... Don't forget the flash would have to fire about 2.69s before the shutter is fully open. -- Ian G8ILZ |
#26
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Prometheus wrote:
In article , Alan Browne writes William Graham wrote: Unless you've got a flash with a guide number of 250 thousand miles........ That would require an f/1 lens for ISO 100. If the lens is f/4 then a GN of 1,000,000 miles would be required... Don't forget the flash would have to fire about 2.69s before the shutter is fully open. ROFL! Right too! Cheers, Alan. -- -- rec.photo.equipment.35mm user resource: -- http://www.aliasimages.com/rpe35mmur.htm -- e-meil: there's no such thing as a FreeLunch.-- |
#27
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Prometheus wrote:
In article , Alan Browne writes William Graham wrote: Unless you've got a flash with a guide number of 250 thousand miles........ That would require an f/1 lens for ISO 100. If the lens is f/4 then a GN of 1,000,000 miles would be required... Don't forget the flash would have to fire about 2.69s before the shutter is fully open. ROFL! Right too! Cheers, Alan. -- -- rec.photo.equipment.35mm user resource: -- http://www.aliasimages.com/rpe35mmur.htm -- e-meil: there's no such thing as a FreeLunch.-- |
#28
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Prometheus wrote:
In article , Alan Browne writes William Graham wrote: Unless you've got a flash with a guide number of 250 thousand miles........ That would require an f/1 lens for ISO 100. If the lens is f/4 then a GN of 1,000,000 miles would be required... Don't forget the flash would have to fire about 2.69s before the shutter is fully open. ROFL! Right too! Cheers, Alan. -- -- rec.photo.equipment.35mm user resource: -- http://www.aliasimages.com/rpe35mmur.htm -- e-meil: there's no such thing as a FreeLunch.-- |
#29
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Prometheus wrote:
In article , Alan Browne writes William Graham wrote: Unless you've got a flash with a guide number of 250 thousand miles........ That would require an f/1 lens for ISO 100. If the lens is f/4 then a GN of 1,000,000 miles would be required... Don't forget the flash would have to fire about 2.69s before the shutter is fully open. And don't use times shorter than 1/60, or you won't capture the light returning from the edges. (That might look interesting, though...) -- Lassi |
#30
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Prometheus wrote:
In article , Alan Browne writes William Graham wrote: Unless you've got a flash with a guide number of 250 thousand miles........ That would require an f/1 lens for ISO 100. If the lens is f/4 then a GN of 1,000,000 miles would be required... Don't forget the flash would have to fire about 2.69s before the shutter is fully open. And don't use times shorter than 1/60, or you won't capture the light returning from the edges. (That might look interesting, though...) -- Lassi |
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