rafaelcasd
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 Re: Manual Focus Nikon Glass | |
GeorgeBo wrote:
Is the optical assembly internally one unit and moves together with the focusing unit? You piqued my interest with the stated image circle. I am wondering if I could remove the optical unit itself and mount remount it for use on a technical camera with a digital back.
rafaelcasd wrote:
kwoodard wrote:
rafaelcasd wrote:
Finally for me today, took the Nikon Tochigi Rayfact 90mm 1:4 for a short walk, this one, here focused nearest:
 Nikon Nikkor 5cm 2.0 Z6 Rayfact 90mm 4.0 01_02 by Rafael Batlle, on Flickr
This is focused farthest
 Nikon Nikkor 5cm 2.0 Z6 Rayfact 90mm 4.0 01_03 by Rafael Batlle, on Flickr
An industrial monster still in production, with cam focusing so it is a bit hard to set it, but of course a master of sharpness and easy for the F mount version to deploy on Z cameras (hard to mount on F and it sticks out too far for any good use, there are several other industrial mounts, not too practical).
On the Zs it will focus from infinity to, I guess, 1/2x and exceeds the camera resolution at all distances.
Just for Kicks here is a spine lens sharpness test at 1:4 - prickly!
(Full size on Flickr)
 nikon Rayfact 90mm 14 home 41 by Rafael Batlle, on Flickr
For more kicks here is the same photo I took with the 8.5cm 2.0 rangefinder, this was at 1:2.8 so there is no comparison, my real point is I like the photo below a lot more! even though it is not sharp enough to poke you.
 nikon nikkor 8.5cm 2.0 RF Z6 backyard 31 by Rafael Batlle, on Flickr
You are not kidding about the sharpness of that lens! That’s a very unusual lens that I’ve never seen before. What was/is the lens purpose? Macro? Super flat plane with no distortion?
It is not a regular photo lens, this is what Nikon says about it:
Features
Rayfact MJ 90 mm F4: Variable magnification range of -0.05x - -0.5x
For high resolution, large-sized line and area sensor cameras.
High performance guaranteed in all range of magnification.
Aperture lockable screw and floating ring lockable screw for easy use.
Unit sells with a wide range of mounts to fit in your camera.
Applications
Image receiving process by both line and area sensor cameras
Flat panel inspection
PCB inspection
Wafer inspection
Printed materials inspection
The image size is 86mm, more than twice the diagonal and 5.7 times the area of the Z sensors, great for George's use of large format sensor cameras, at the sensor pixel spacing of the Z6 it would support 136 megapixels for the 86mm image size.
My copy has an F bayonet and the way I mount it gives me about .5X to infinity, which is pretty much what it is designed for: 1/20x to 1/2x. The difference between 1/20x and infinity focus is insignificant for resolution on a Z sensor. Lens is heavy, my only complaint is that the lens is intended to be locked with a fixed focus in imaging equipment so it does not have a helicoid, but a cam and locking screws, it is still usable but not for anything that moves, stepping it for image stacking may be a challenge unless mounted on a stepping track.
There are many for sale in eBay at all kinds of prices, I paid $400 for mine in perfect condition.
Not sure exactly what you mean about the movement of the focusing unit George, so let me describe it:
The lens assembly rides inside a thick heavy aluminum tube, once mounted you turn the heavy outer tube to focus......however... different lenses move in different cams that ride in the outer tube, it spaces the elements differently as you focus.....I think if you remove it from the outer tube it would be able to focus properly.
There are many screw type mounts that this same lens and other Rayfacts come in, Mine is F, but there are the following mounts and backspaces:
Model Camera Mount Diameter/length *2 Weight
1) OVM05042MN-M72D1 M72 (M.B.f=19.56 mm) 84 mmΦ x 127.3 mm - 147.9 mm Approximately 920g
2) OVM05042MN-M72D2 M72 (M.B.f=6.56 mm) 84 mmΦ x 140.3 mm - 160.9 mm Approximately 940g
3) OVM05042MN-M72D3 M72 (M.B.f=12 mm) 84 mmΦ x 134.9 mm - 155.5 mm Approximately 930g
4) OVM05042MN-M72N M72 (M.B.f=31.8 mm) 84 mmΦ x 115.1 mm - 135.7 mm Approximately 900g
5) OVM05042MN-M90D M90 (M.B.f=12 mm) 95 mmΦ x 134.9 mm - 155.5 mm Approximately 950g
6) OVM05042MN-NMT M84.5 (M.B.f=41 mm) 93 mmΦ x 105.9 mm - 126.5 mm Approximately 890g
7) OVM05042MN-FMT F Mount (M.B.f=46.5 mm) 84 mmΦ x 100.4 mm - 121.0 mm Approximately 880g
8) OVM05042MN-M95E M95 (M.B.f=9.4 mm) 100 mmΦ x 137.5 mm - 158.1 mm Approximately 960g
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