Nikkor 6mm 2.8 Ai

[RonVol]

Erik, how will you be allowing for the axial movement of the relay stack due to focus movement of the lens helicoids?

[Bjørn Rørslett]

That might not be necessary. In the relay department, we can do a coarse focusing beforehand, then use the lens' own focusing ring for the actual shooting.

[Erik Lund]

The lens relay stack can slide inside the ring

[Erik Lund]

As I have all the parts, just not machined here is a mock up of the support ring for the tripod placed at 10cm from the camera and the RRS plate will go through the base-plate, when machined

Lens relay will slide inside the ring and camera is supported by the base-plate,,,

A long rail could support the whole system from camera to Fisheye, not sure this is needed,,, But it would make it extra rigid.

Relay support Nikkor fisheye 6mm by Erik Gunst Lund, on Flickr

[RonVol]

Thanks for showing the progress.
Looks like it's coming along nicely indeed 

[Erik Lund]

Thanks!

I just realized when doing the mock up that I don't need the Base-Plate in Video set-up - If the relay is only 20cm long, and the D810 has the battery pack and RRS L-Plate mounted then I just need a long rail to hold the lens and camera into position.

After setting up infinity focus on the relay, the length can be locked down as Bjørn says. Since focusing will be IF inside the 6mm Fisheye,,,

[John Koerner]

Wow 

[Jan Anne]

Wow 

Welcome to NikonGear

[John Koerner]

Indeed.

And just subscribed. Appreciate the time and history lessons.

[Erik Lund]

So here is a snap of the situation this morning, was a late night up working on the mock up for the relay system Bjørn is nicely putting together fro the video 16:9 format Fish-eye project

The keen observer will see an old Micro-Nikkor 105mm f/4 Ais, similar body size as the 6mm and with the hood it as same length when at minimum focus and the dedicated hood so together with the sectional view print enough to get close to getting the support right,,,

I could read between the lines Bjørn's concern for the well being of the relay lenses - and I concur! Fortunately with the added grip with EN-EL18a for plenty of power for the video the height of the camera incl the RRS plate is close to the height of the 6mm so very little shimming is needed, so we will have a very stable set-up both regarding handleling but also to set up and shoot, the clamps will just be loosened for initial focus of the relay, then locked down for shooting,,,

Also to be seen now is the TC-201, which is the dedicated tele-converter for the Big eye, 12mm Fisheye,,,  Sounds fun to me and this old TC has several times surpriced me for close-up work where it has often done much better than using extension rings,,, food for thought for Michael's stacks perhaps 

_EGL1458 by Erik Gunst Lund, on Flickr

[Erik Lund]

So here is the almost finished Vertical support-base for the Big eye, the three holes for the rods are to be drilled when I have checked the PCD an extra time, fist the overall plate with the level.

Fisheye Nikkor 6mm f/2.8 Vertical Support base Gitzo Series 5 by Erik Gunst Lund, on Flickr

then with mounted on the Gitzo Series 5, seen from below

Fisheye Nikkor 6mm f/2.8 Vertical Support base Gitzo Series 5 by Erik Gunst Lund, on Flickr

With Spikes

Fisheye Nikkor 6mm f/2.8 Vertical Support base Gitzo Series 5 by Erik Gunst Lund, on Flickr

With rubber feet

Fisheye Nikkor 6mm f/2.8 Vertical Support base Gitzo Series 5 by Erik Gunst Lund, on Flickr

And here on the tripod

Fisheye Nikkor 6mm f/2.8 Vertical Support base Gitzo Series 5 by Erik Gunst Lund, on Flickr

[Bjørn Rørslett]

Erik, your mechanical engineer training really shines through here. Top notch workmanship.

The relay system for the video use with the 6 mm will comprise 35/1.4 & 50/1.2. The Repro-Nikkor relay approach does work, but the projected image circle is smaller. I have tested the relay with my 8 mm f/2.8 and it seems to work just fine.

[Erik Lund]

Thanks Bjørn -

And those two lenses are perfect for the job

[Jakov Minić]

Amazing stuff Erik!
Are you going to have enough space for other gear

[Erik Lund]

Thanks Jakov -  And yes,,, I was thinking the same,,,  What to do,,,

Here it is with the rods

Fisheye Nikkor 6mm f/2.8 Vertical Support base Gitzo Series 5 by Erik Gunst Lund, on Flickr

Cant wait to do some IR with it - Sure hope there is no hot spot