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06-14-2018, 08:18 AM   #1
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Rokinon 8mm lens with K-1

Has anyone used the Rokinon 8mm fisheye lens with removable hood
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on the K-1? Does the sensor capture the entire circle? Sample pics? Thanks.

06-14-2018, 09:00 AM   #2
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QuoteOriginally posted by tomcook Quote
Has anyone used the Rokinon 8mm fisheye lens with removable hood
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on the K-1? Does the sensor capture the entire circle? Sample pics? Thanks.
AFAIK it's a crop lens, you'd get a circle in the frame.

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06-14-2018, 09:56 AM   #3
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Christopher Frost did a review on FF and cropped Cannon, in 2016. It shows the image on both--you get quite a bit more on FF. Correction it was 2014. (Sorry I don't seem to know how to copy the link.)

Last edited by dms; 06-14-2018 at 10:04 AM.
06-14-2018, 11:00 AM   #4
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I have a Samyang 8mm with non removable hood, and a K-1, but I have never combined them. I did some research about the Samyang before I bought the K-1. The hood on the Samyang limits the image circle to a rectangle slightly larger then APS-C. When the hood is removed the image becomes almost circular with a diameter about 1,2-1,3x the diagonal of APS-C, depending on how much vignetting you feel are acceptable and what aperture you use. In other words somewhere in between APS-C and FF. If you prefer square crops it will be almost 1,5x a square crop from APS-C.

Anyway, I decides to buy a Zenitar 16mm f/2,8 to replace the Samyang, I just havent got my self to sell the Samyang yet.

06-14-2018, 01:01 PM   #5
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I would not recommend it, after trying it out, I noticed that the hood creates a serious rectangular vignette which negates the wide angle of the Fisheye.
06-14-2018, 01:07 PM   #6
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I trimmed the hood of my Rokinon 8mm fisheye a few years ago in order to mount it on a Canon T3i with adapter. The adapter shifted the lens to some angle which ended up causing shading, even though the T3i was an APS-C body too.
I tried it on my K-1 II recently and just got a circle in FF mode. No point. I sold the lens to a friend who owns a K-30.
06-14-2018, 01:08 PM   #7
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QuoteOriginally posted by tomcook Quote
Does the sensor capture the entire circle? Sample pics? Thanks.
QuoteOriginally posted by Adam Quote
AFAIK it's a crop lens, you'd get a circle in the frame.
There are quite a few examples online and the Samyang 8mm's image circle (removable hood version) does not quite fit in the 24x36mm frame. There is a cut off at top and bottom. The fixed hood version projects a vaguely rectangular image to FF.


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06-14-2018, 01:20 PM   #8
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The 8mm FE will leave a definite circle, however if you couple with a 1.4 TC it is very useable in FF.
Mine is the Bower with out detachable hood.
Here is an example to show how little vignette there is with the TC attached.
8mm APS FE + 1.4TC + K1 - PentaxForums.com

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