Identify the Mystery Object.

It's a camera viewfinder. Second version.

 

From Nikon | Imaging Products | Evolution of NIKONOS

The Nikonos II is the successor to the original Calypso underwater camera, licensed to Nikon and re-introduced as the Nikonos. The Nikonos II was made from 1968-1975, and aside from the II markings beside the viewfinder, it adds a fold-out film rewind crank and an improved film pressure plate. A version branded as Calypso/Nikkor II was sold in Europe.

The Nikonos II can be used at depths up to 50m (160 feet, 26.67 fathoms). It uses 35mm film for a 24x36mm image size, has a focal-plane shutter with vertical travel and X & FP flash sync options (highest X-sync is at 1/60), and offers shutter speeds of 1/30,1/60, 1/125,1/250,1/500 and Bulb. The viewfinder has 35mm coverage and parallax correction marks for close-ups. The body is die-cast aluminium alloy sealed with O-ring gaskets.

The standard lens is a Nikkor 35mm f/2.5 with zone focusing and a useful depth of field scale. Unlike on the original Nikonos, the "II" version has a dual feet/meters distance scale and re-introduces the white lines from the Calypso lens to indicate which knob controls which function. The protective planar glass front of the 35/2.5 lens permits its use both above and below water. (When submerged, the stronger refraction of water yields a field of view equivalent to a ~47mm lens on land.)

LA SPIROTECHNIQUE, a French offshore machinery development company,

 

If you guess it first take a mystery photo of some object around your home and post it for us to guess.
This one should be easy but maybe not.
Question is... What is this object?
A drinks coaster is wrong  

Subscribe to see EXIF info for this image (if available)

 

Psh... sez you...  

Subscribe to see EXIF info for this image (if available)

 

still the wrong answer  

 

Nope, not right

 

Looks like a washer.

 

bigger than a washer ... junkyardsparkle has a better picture, just didn't tell me what it is besides a drinks coaster  

 

The gray market version of The Beatles White Album on a 45.

 

Absolutely hilarious but nope

 

Is that button ?
Or lamp.
I think guesing like this is a nonesence, at leaat write something about it, how big it is, or some direction.

 

Post #12 already point back at junkyardsparkles post
If you scroll up to junkyardsparkles reply the sizing is quite indicative... it is 94mm across and is an essential component in a very very common item we have all used in some way

 

Regenerative plutonium braking pads for a flux capacitor  

 

HDD Platter?

 

Well done Keith

Over to you mate

Cheers
Phil
PS - i use them for drinks and coffee cup coasters all the time  

 

Not at home but at the office . . . . hmmmm... something lying around here.
Seeing as a lot of the members here are technically minded this should be easy!

Subscribe to see EXIF info for this image (if available)