here we have a choice of 2 very rare optical viewfinders for underwater camera housings, the likes of subal, seacam, sea & sea, aquatica etc etc, please contact me and I can tell you of compatibility. 

I HAVE NOW SOLD THE SUBAL VIEWFINDER PICTURED, HOWEVER I MAY HAVE ANOTHER ONE AVAILABLE. THE OTHER ONE AVAILABLE HAS PREVIOUSLY BEEN RETROFITTED ON ANOTHER MAKE OF HOUSING AND WILL NO LONGER WORK WITH SUBAL HOUSINGS BEING SEALED WITH O RINGS AND TIGHTENED WITH SCREW. IT CAN HOWEVER BE SILICONED GLUED ONTO A SUBAL OR ANY OTHER HOUSING. IT'S EASY TO DO AND I HAVE DONE THIS MANY TIMES IN THE PAST. THIS ONE STILL FUNCTIONS PERFECTLY AND IT CAN BE SOLD CHEAPER ACCORDINGLY. I CAN ALSO OFFER FITTING IF NEEDED

These are not often for sale, they are a specialised bit of kit. I could never not use them myself, it increases the size of the viewfinder and also the ability to use at a distance which enables comfortable viewing through a dive mask. It makes getting the right image so much easier. I just don't need as many systems nowadays so I'm selling up some kit

You are buying just one of the items pictured, (please email me regarding availability of what one you require) either the subal gs straight viewfinder or the inon straight viewfinder. These are not cheap bits of kit, the subal is £900 from cameras underwater as can be seen here (pictured with a canon 5dmk3 housing but fits many many more) - http://www.camerasunderwater.co.uk/slr/subal/canon/5dmk3

I have also retrofited these type of optical viewfinders onto other housings without issue in the past, currenty I have another one of the subal ones on a seacam housing to give you an idea. These have both been checked and are perfectly functional, the subal one is like new really, the inon has a couple of surface scratches on the black paint

I'm a private individual not a shop and I offer no extended guarantee on items, the items are used are guaranteed to be working and as described on arrival. Due to a bad experience I have to now point out that  any paypal abuse will not be tolerated, scam attempts will be reported to the police, there will be no need for a return as the item is exactly as described but as paypal requests that I state that the buyer is responsible for all shipping costs

 Any questions please ask