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Fill flash with long lenses and the Better Beamer
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<blockquote data-quote="spb_stan" data-source="post: 615605" data-attributes="member: 43545"><p>A Fresnel lens is usually just cast plastic but that is how if can be made affordable. It has very small lens sections cast into the surface in concentric rings to focus the light in a parallel beam instead of the natural spread of light at a distance. They can be tricky because the narrow beam, not spreading as you are used to, means it is only effective with narrow field of views, and severe fall off to to the sides. Most would be effective with small birds with 200mm fl but for larger subjects like deer or bear, 300 mm might the widest field of view that is fully illuminated. 3 stops improvement is certain possible on a small subject. They are useless for wide subjects, unless you just need a face highlighted for example. With such a tighter beam, alignment on your camera is critical. Test shots are needed for the distance you are expecting the subject to appear at.</p><p></p><p>Edit: IF you know the range where your subject is expected, the simple answer is to set out a speed light or two close to the area, manually zoomed wide. There are low cost alternatives to Pocket Wizards flash controllers with 300 foot range. I use the Yongnuo YN-622n Tx transmitter and YN-622N Transceivers and they have worked flawlessly.</p></blockquote><p></p>
[QUOTE="spb_stan, post: 615605, member: 43545"] A Fresnel lens is usually just cast plastic but that is how if can be made affordable. It has very small lens sections cast into the surface in concentric rings to focus the light in a parallel beam instead of the natural spread of light at a distance. They can be tricky because the narrow beam, not spreading as you are used to, means it is only effective with narrow field of views, and severe fall off to to the sides. Most would be effective with small birds with 200mm fl but for larger subjects like deer or bear, 300 mm might the widest field of view that is fully illuminated. 3 stops improvement is certain possible on a small subject. They are useless for wide subjects, unless you just need a face highlighted for example. With such a tighter beam, alignment on your camera is critical. Test shots are needed for the distance you are expecting the subject to appear at. Edit: IF you know the range where your subject is expected, the simple answer is to set out a speed light or two close to the area, manually zoomed wide. There are low cost alternatives to Pocket Wizards flash controllers with 300 foot range. I use the Yongnuo YN-622n Tx transmitter and YN-622N Transceivers and they have worked flawlessly. [/QUOTE]
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Fill flash with long lenses and the Better Beamer
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