Focal Reducer Availability

**Bob 256** · 11-28-2017, 03:47 PM

Originally posted by UncleVanya

Do you have the version coming that has a removable hood?

Ah, and there's that. When I purchased the lens, I wasn't aware that there are two versions and jumped on the sale version ($199US) which has a permanent hood. I could have answered my own question if I waited for the lens to arrive.

It did get here today, and although I won't be doing any circular fisheye shots with it, it's a pretty nice lens. In crop mode, it fills the frame on the K-1 and controls distortion nicely (it wouldn't make you think of a fisheye on some subject matter). I think I'll be quite happy with it and I can cut a circle in a piece of cardboard if I want the circular effect

Thanks for all the input folks. I learned a lot about focal reducers in the process.

**UncleVanya** · 11-28-2017, 04:08 PM

Originally posted by Bob 256

Ah, and there's that. When I purchased the lens, I wasn't aware that there are two versions and jumped on the sale version ($199US) which has a permanent hood. I could have answered my own question if I waited for the lens to arrive.

It did get here today, and although I won't be doing any circular fisheye shots with it, it's a pretty nice lens. In crop mode, it fills the frame on the K-1 and controls distortion nicely (it wouldn't make you think of a fisheye on some subject matter). I think I'll be quite happy with it and I can cut a circle in a piece of cardboard if I want the circular effect

Thanks for all the input folks. I learned a lot about focal reducers in the process.

My understanding is a bit limited on this topic but as I understand it the 8mm Rokinon is a "Stereographic Projection" style fisheye which I'm told reduces distortion to a degree while allowing you to use it to get distorted results by angling the lens more. I love mine.

dConvert · 11-29-2017, 09:34 AM

Originally posted by Adam

AFAIK the design of the K mount means a focal reducer isn't possible.

A focal reducer to take K mount lenses onto a k mount body isn't possible, but one to take medium format lenses would be. As is K mount lenses to MFT (I use one going via a EF mount) or K mount to Q-mount...

To work a focal reducer must mount the lens closer than it was initially designed to go so it's always impossible to have the same mount on both sides.

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11-28-2017, 03:47 PM	#16
Bob 256 Site Supporter Join Date: Jun 2008 Location: Idaho Photos: Gallery Posts: 2,375 Original Poster	Originally posted by UncleVanya Do you have the version coming that has a removable hood? Ah, and there's that. When I purchased the lens, I wasn't aware that there are two versions and jumped on the sale version ($199US) which has a permanent hood. I could have answered my own question if I waited for the lens to arrive. It did get here today, and although I won't be doing any circular fisheye shots with it, it's a pretty nice lens. In crop mode, it fills the frame on the K-1 and controls distortion nicely (it wouldn't make you think of a fisheye on some subject matter). I think I'll be quite happy with it and I can cut a circle in a piece of cardboard if I want the circular effect Thanks for all the input folks. I learned a lot about focal reducers in the process.

11-28-2017, 04:08 PM	#17
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,407	Originally posted by Bob 256 Ah, and there's that. When I purchased the lens, I wasn't aware that there are two versions and jumped on the sale version ($199US) which has a permanent hood. I could have answered my own question if I waited for the lens to arrive. It did get here today, and although I won't be doing any circular fisheye shots with it, it's a pretty nice lens. In crop mode, it fills the frame on the K-1 and controls distortion nicely (it wouldn't make you think of a fisheye on some subject matter). I think I'll be quite happy with it and I can cut a circle in a piece of cardboard if I want the circular effect Thanks for all the input folks. I learned a lot about focal reducers in the process. My understanding is a bit limited on this topic but as I understand it the 8mm Rokinon is a "Stereographic Projection" style fisheye which I'm told reduces distortion to a degree while allowing you to use it to get distorted results by angling the lens more. I love mine.

11-29-2017, 09:34 AM	#18
dConvert Junior Member Join Date: Mar 2010 Location: Essex Photos: Gallery Posts: 41	Originally posted by Adam AFAIK the design of the K mount means a focal reducer isn't possible. A focal reducer to take K mount lenses onto a k mount body isn't possible, but one to take medium format lenses would be. As is K mount lenses to MFT (I use one going via a EF mount) or K mount to Q-mount... To work a focal reducer must mount the lens closer than it was initially designed to go so it's always impossible to have the same mount on both sides.