Nikkor 6mm 2.8 Ai

[Erik Lund]

Two portraits with Nikkor 6mm 2.8 Ai at f/5.6 on D810 Iso 400

_EGL0946 by Erik Gunst Lund, on Flickr

_EGL0947 by Erik Gunst Lund, on Flickr

[Bjørn Rørslett]

I have this nagging suspicion these will not be the last ones by the mighty 6 mm f/2.8 posted on NG ...

Erik has arranged for this lens to accompany us to Scotland. A true NG First !!



The lens has 220 degrees field of view and thus can look behind itself.

[Dr Klaus Schmitt]

Amazing one indeed, too bad i sold mine... oh well.

[Erik Lund]

Looking forward to do some creative shooting with it!

NIKKOR 6mm f/2.8 Ai D810 by Erik Gunst Lund, on Flickr

[RonVol]

WOW!!

Shoot some video footage with that baby please 

[Erik Lund]

We intend to, Bjørn already put together an optical relay to retain the circular image even though the D810 'crop' to 16:9

[Bjørn Rørslett]

According to Erik, we need a relay system to reduce the image circle to make it fit inside the narrower video frame. I have made one solution that apparently works and will try out at least another before we arrive in Scotland.

Meanwhile, any video footage will be slightly cropped top and bottom of the image circle projected by the fisheye.

[Jakov Minić]

I love these lunatics!

[RonVol]

According to Erik, we need a relay system to reduce the image circle to make it fit inside the narrower video frame. I have made one solution that apparently works and will try out at least another before we arrive in Scotland.

Meanwhile, any video footage will be slightly cropped top and bottom of the image circle projected by the fisheye.

Yes, Erik is of course correct.
These guys had the same problem - https://youtu.be/Aw0i_I2TaAM
The stills they recorded show the full image circle but the video is cropped.

[Bjørn Rørslett]

I'm aiming for 0.7X reduction of focal length. That should make the image circle fit inside the frame for video.

[RonVol]

Something like this perhaps? 

A quote from the guy who put this together - "We had to build a heck of a reflex lens assembly [note the other Nikon lenses in the stack] to shrink the 8-perf image circle from the lens to the 3-perf negative area of the RED."

http://img.gawkerassets.com/img/17kmpym252yivjpg/original.jpg

[Bjørn Rørslett]

I used relays for my 10 mm f/5.6 OP-Fisheye on the D1 way back in 2000 ... The combination shown is OK as it provides 0.7X, but there is no field lens or fine-tuning of focus. I might use the Repro-Nikkor 85/1 and a reversed 1.4X TC instead. Adding a helicoid for focusing is required in my opinion. Otherwise too much strain is put on the respective lenses.

[Bjørn Rørslett]

This is the 10 mm f/5.6 OP Fisheye Nikkor with a 0.6X relay lens on a D2X.  I aim for slightly more for the 6 mm on an FX camera.

[rosko]

That's an amazing piece of glass !

I would be scared to scratch the front lens. I wonder how is the protection. Something like the Nikkor 14mm f/2.8 (leather lid) ?

[Erik Lund]

Yes a relay similar to the one on the RED camera, I stole the idea from Bjørn when he did the DX relay as he mentions

There are two ways of mounting the lens, a 'standard' foot build into the base of the lens but also three 1/42 UNC sockets at the rear of the lens housing for vertical shooting,straight up.

For the standard shooting approach I have almost all the pieces; A carbon fiber Gitzo Series 5 with the lateral arm and a Burzynski ball head to lock it down for stills, I will have to look into If we need a fluid video head for the video or we just keep it simple and use the movements of the tripod, the 220 degree field of view put some restrictions on the possibilities,,,

The vertical shooting will be based on a stand-alone special build rig with a 6mm aluminum base-plate and three ø12mm aluminum rods connected to the lens via the three 1/4" sockets, it will have feet/spikes to sit low on the ground.

The vertical rig will have a ø85mm Gitzo ring so it also locks firmly onto the tripod. To be able to operate the camera and see the rear screen the base-plate will have a ø70mm hole to see through inside the ring/tripod.