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With a compendium hood that has its own movements, you can adjust the shade for camera movements.
A darkslide may keep the sun off the front element, but the object of a compendium shade is to eliminate all non-image light that could reduce contrast from reflections within the lens or from the bellows. Also with a very wide lens a handheld flag of any sort is liable to dip into the image area between composing the shot on the groundglass, inserting the holder, and making the exposure.
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I have the slotted square lee lens hood. It is fine with my 110 and 210 lenses. It is not fine with my 72 lens. For a 90mm lens the slotted wide angle hood may be OK. But the normal wide lens hood which also requires the filter holder to be attached to lens first, will vignette the lens.
The lee system was designed for medium and 35mm formats. It works on large format too but you have to be careful when you get down to wide lenses.
If its a fast lense the physical size of the front element plays a part because the greater the diameter, the more likely you are to get vignetting. Lee say the wide angle slotted hood should not vignette a 90 lens but it gives so little shading that its barely worth it for the cost.
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Don't forget that its all very well the hood not vignetting when everything is centred and square on the camera. But when you introduce some tilt and shift it very likely will vignette so in short for wide angle lenses, you are better off using your dark slide to shade the lens from direct sun.
Last edited by rob champagne; 07-03-2008 at 07:27 AM.
Reason: spelling
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