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Using Focal Reducers On Full-Frame Bodies

Started Jul 13, 2014 | Discussions thread
Cullings Regular Member • Posts: 200
Re: 8mm Fisheye On Focal Reducer On Full-Frame Body

ProfHankD wrote:

_sem_ wrote:

ProfHankD wrote:

I'm particularly curious about some of the Samyang 8mm lenses being used this way... because they might actually give a usable circle covering a bit more than 180 degrees.

Samyang 8mm are made for APS-C, and I guess you can find relevant info on spherical pano sites. I know shaved Nikkors DX 10.5mm are used on FF bodies (even Canons) for such purposes without focal reducers, indeed covering more than 180deg.

The expectation is a roughly 21.6mm diameter usable image circle with a view angle of approximately 191 degrees... but we'll soon see. I have the Opteka version of the Samyang 8mm (with removable hood) coming to me as I write this....

Hi, did you get your 191 degree image circle using the Opteka? That would be 12 megapixels within the circle assuming you have a 24 megapixel sensor??

I am considering using a Mamiya 24 mm medium format fisheye lens with a Mamiya-to-Canon adapter and a 0.7 Canon-to-Sony focal reducer.  Do you think that would also achieve a true circular image?  That could yield a 12 or 18 megapixel image circle depending upon A7 or A7R.  - John S.

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