- Banned
- #261
Pawel Achtel
Banned
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- Oct 12, 2007
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I am new to the filming world so please understand if I show my ignorance. I come from the stills photo world where I have been happily shooting since the NikV with the amazing 15mm. People are shooting 5D's @20MP and D800's @37MP quite successfuly behind dome ports. What becomes very important is getting the correct extension ring length to match your lens. Also it is just a given that rectilinear lenses need bigger domes than fisheyes. I notice Gates only offer 2 different extension rings and I am not sure about Amphibico. I have been very happy with the resolution and sharpness shooting stills with my 5DMkiii and 16-35mm behind a 9" dome with the correct length extension ring. Is shooting moving pictures fundamentally different in this regard.
Mark
Mark, welcome to Reduser.
Shooting motion pictures is similar to stills with one important exception: you don't have much control over the shutter speed (which is usually set fixed to 1/2 of the frame rate) and the amount of light that video lights provide is only a fraction of what you get with a strobe. This means that you may need to shoot at wider apertures than with stills.
This has some consequences because dome ports, due to image field curvature, do not perform well at wider apertures and need to be stopped down to f/8 - f/16 to obtain reasonable results.
For this and other reasons we developed DeepX that uses Nikonos lenses - the only optics able to out-resolve the Epic sensor. Even at f/2.8 the Nikonos 15mm resolved more than 4k on my optical bench. This is not possible with dome ports.