Fiber Optic Sights for Pneumatic Speargun

[Fibonacci]

Great stuff Gecko... you are a true Sub-Aqua-Innovator

I think the rear sight would be best as a 'Ghost Ring' aperture style... rugged and well protected, fast to use as your eye automatically centres the front sight. Easier to use in low light and typically used on military firearms used for quick battle action!

 

[Diving Gecko]

Haha, thanks but I am just kinda being heavily influenced and then adapting a little...

I made a new sight which incorporated an idea that I had from seeing another shot gun sight called the Easyhit. The idea is that the glowing end of the fiber optic rod sits deep in the tube. To see the sight clearly you have to line the gun up correctly meaning that you are already on target. I think it is a bit the same as the round rear sight, that it aids in acquiring the target very fast.

I am not sure if this works underwater at all though, haha. The refraction might play games with the sight and I don't really know enough about it to foresee what's going to happen. I theorize that the dot could become really small, or the opposite. We will see.

On land it looks like this:

The screwdriver points to where the fiber ends:

And here a triptych trying to illustrate how that once you see a full circle, you will be aiming straight (last pic):

 

[Fibonacci]

Very ingenious... though 'sight radius' is also the issue.

Having a ghost ring rear sight and an optic fibre front sight maybe 90cm away from it makes for a long sight radius and theoretically a more accurate gun.

On a centrefire rifle with a range of a couple of hundred metres this makes a BIG difference but on a speargun with a fixed maximum range of ~10m this may be a moot point?

 

[popgun pete]

Many years ago I remember a sight called the "Red Dot", it may still be available as I have not remembered it until now and have not looked for it recently. It was for rifles and maybe shotguns, but the principle was you looked with one eye at the red dot (which was aligned to the bore of the weapon) and your other eye looked at the target. This created a superimposition in the brain by the stereoscopic merging of the images, the red dot appearing to float over the target. Now I recall some users swore by it, while others swore at it, complaining that they felt that they were going cross-eyed when attempting to use it. It may have also been called "Hot Dot", I cannot remember as this was when firearms could be purchased at many gun shops and sports/fishing shops in the city which changing firearm regulations have totally eliminated for many decades. However it would be interesting to know if such a system worked for the spearfisher as you already have the "red dot", or whatever other colour you decided to use.

I just googled it: https://en.wikipedia.org/wiki/Red_dot_sight

Another reference: http://www.opticsden.com/best-red-dot-sight/

Shotgun sights are discussed here: http://www.reloaderaddict.com/best-red-dot-sight-for-shotgun/

It seems to me on reading the above that this "Red Dot" was something slightly different, but the major aspect was you had to use both eyes and the timing of the product was around the early seventies.

 

[Fibonacci]

When in doubt look at the Brownell's website... one of the biggest online retailers of firearm parts and accessories in the world!

Five pages of Red Dot sights...
http://www.brownells.com/optics-mounting/electronic-sights/red-dot-sights/index.htm

I like the Trijicon MRO... compact, rugged and waterproof to 30m... looks perfect for a pneumatic speargun and on sale for only US$493-$544.99
https://www.brownells.com/UserDocs/Miscellaneous/TrijiconMROSpecs.pdf

Just need Gecko to mount an AR-style Picatinny rail on top of his gun

 

[popgun pete]

Just to complete the reference to the laser sight on the "Seabear", here is their advert from 1996. The passive sights discussed here in this thread are a better proposition as they don't add a potential snagging hazard like this bracket mounted laser does. Plus if not properly aligned to the shaft flight at some range where the two lines intersect then the laser will not provide much of an advantage.

The claims on the advert are somewhat fanciful and relied on a market not being fully aware of the true story behind these guns.

 

[jorz21]

my efforts...

 

[popgun pete]

my efforts...

Very good, perhaps you can describe your technique in application of stripe to ensure such a good result in terms of the alignment. Hard parts affixed by what method at front and rear? Your gun is a "Cyrano" with a carbon fibre tank or sleeve?

 

[Diving Gecko]

Just a quick update.
My trip to the Philippines did not yield the results I'd hoped for. I had brought styrofoam targets but the pool at my disposal had a viz of, literally, less than two meters.
So, no sight calibration, target and penetration testing of different shaft thicknesses and pressures:-(.

I did find out that the fiber optics work best when the end doesn't sit deep in the tube but rather, goes all the way to the end. I still suspect there might be a refraction issue making the dot tiny but in reality, the bigger issue was that often the tube would hold air bubbles that would make the front sight almost impossible to see.
This happened every time the gun had been on the surface. Getting the bubbles out was not easy so I cut away the tube until the fiber end was just exposed.




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[popgun pete]

Maybe a drop of detergent on the sight tube might help wet it down by breaking the surface tension to eliminate air bubbles.

 

[Diving Gecko]

Thought about it (I do that on GoPros sometimes). Just figured it wasn't worth the hassle.

Anyways, it's too late now - I cut down the tubes already;-)

 

[Diving Gecko]

All are good . i am also suggest some .
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Welcome spammer:-(
Can I humbly suggest you remove your completely misplaced post right away. That way, the administrators won't have to ban your profile completely. Though perhaps they should as I don't think you have any proper spearfishing products or knowledge, right?



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[Stephan Whelan]

Welcome spammer:-(
Can I humbly suggest you remove your completely misplaced post right away. That way, the administrators won't have to ban your profile completely. Though perhaps they should as I don't think you have any proper spearfishing products or knowledge, right?



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Too late - they are gone

 

[Diving Gecko]

Too late - they are gone

Great, thanks for the swift justice. You are doing one heck of a job keeping this place clean


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[Stephan Whelan]

Great, thanks for the swift justice. You are doing one heck of a job keeping this place clean

It's not just me - the whole team of staff are superstars.

 

[popgun pete]

Just on the theme of speargun sights I purchased this green laser plus mounts for a rifle attachment rail or piggy-back on a scope. The main goal was to get the green laser as at US$I6.00 it was unbelievably low cost (some eBay sellers even had it at US$12.00!), even though the mounts are useless for speargun applications. Now as is the laser is not waterproof, but it is something that could be encased in a clear tube and mounted on a pneumatic gun. I just regret throwing out an old Underwater Kinetics “Super Q” light screw cap sealed one-piece clear polycarbonate housing that would probably have swallowed this laser whole after the adjustment knobs were removed.
https://www.ebay.com.au/itm/Tactical-Green-Dot-Laser-Sight-Rifle-Gun-Scope-Rail-Remote-Switch-For-Hunting/401544579364?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649

This complete unit is very similar to something that costs US$270 in the West, so there are some short cuts taken somewhere, but a marinized green laser in a waterproof screw tail cap switch flashlight housing costs US$99.95! Another possibility would be to use the laser, suitably buried somewhere in the gun, to illuminate via light pipes the glow sights that started this thread.

 

[popgun pete]

Well as discussed way back in this thread, some other "eyes" are looking over these threads, including the designers at LG-Sub!

 

[Diving Gecko]

There's a Corsican(?) spearo that has used fiber optics for a long while - perhaps/probably longer than me, so they might have gotten it from him.
He uses some long custom made vacuum guns with extra floatation nicely wrapped in a carbon sleeve. I haven't watched his videos for a while but his guns were branded Carbonazzi, I think. Perhaps his name was Fabrice/Fabrizio... I'll try to find him at another time.
Come to think about it, I think perhaps it was in one of his videos that I spotted the muzzles from Dima the first time around.

 

[Nico66]

Hi. You talk about fabrizio Ibba?

In fact carbozzi spearguns were made by a corsican guy named Romain Orrazi. He stopped to sell spearguns but another guy named christophe Cattini continues to create and sell Carbozzi guns.

Indeed there is optic fiber on some of the carbozzi guns

(As an example, here it is one of Romain Orazzi spearguns).

 

[popgun pete]

It would be good to see these "glow sights" underwater in order to gauge how bright they are. On dull leaden sky days it can be surprisingly clear underwater and while on shore one may think it is no good for diving, but when you plunge in it can be very good, but the water must be crystal clear. Under these conditions I wonder how well will they glow? However if the plastic has a light chargeable component https://www.glowinggecko.com.au/?gc...ZljcJYYVBjkklacJQ-E8e_WAatW53-ixoCoGoQAvD_BwE then maybe the sights would illuminate under all ambient lighting conditions as when internal reflection fades away inherent luminescence takes over.

If you think about it the mainstream manufacturers have been lazy in their latest offerings as their guns are devoid of imagination, the ugly “Cyrano” (nee Evo), the ugly “Predathor” muzzle and the humpback Cressi “Saetta”, although in the metal the latter is surprisingly the best looking of these three as photos don’t do it justice. However it is the less ambitious of these Italian guns, probably being stimulated by “it will be embarrassing if we don’t offer something new soon as the “SL” has been around longer than most of our employees”. I have not mentioned the Omer guns as although the "Airbalete" made everyone aware of something new, it was the ugliest of all these guns including the "One AIR" paddle and only redeemed by the Omer XII which was the gun choice of Russian President Putin.