Hi,
Please see the video (YouTube).
(making the video is more difficult than making the light.)
thank you.
Please see the video (YouTube).
(making the video is more difficult than making the light.)
thank you.
DIY Cree R5 focusable U/W light
- Thread starter hanachan
- Start date
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Linger
Flashlight Enthusiast
Wow.
wll done, very well done.
(p.s. that tall thin doorway is very reminicient of Nihon)
wll done, very well done.
(p.s. that tall thin doorway is very reminicient of Nihon)
nice system. does it stay in the same focus when you shake it around?
which lens are you using?
where would you get such magnet?
'no chromatic aberrations' is not correct though. You won't see it due to the intense light. chromatic aberrations are always present with a single lens as this is an effect which is caused by the wavelength-dependend refractive index of the material.
Johan
which lens are you using?
where would you get such magnet?
'no chromatic aberrations' is not correct though. You won't see it due to the intense light. chromatic aberrations are always present with a single lens as this is an effect which is caused by the wavelength-dependend refractive index of the material.
Johan
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Packhorse
Flashlight Enthusiast
Excellent idea.
imnata
Newly Enlightened
Looks very nice! :thumbsup:
How does the magnet stay in the desired position?
How does the magnet stay in the desired position?
Linger
Flashlight Enthusiast
Yeah, but then he'll just slide the outer ring down and re-link the magnet on the inner lens. It's magnetic, after all.
Could be the only focusable system that can be fixed by end user with no tools while underwater.
Could be the only focusable system that can be fixed by end user with no tools while underwater.
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lucca brassi
Enlightened
Nice idea , but....... COMPASS 😳 ORIENTATION :devil:
Packhorse
Flashlight Enthusiast
The amount of magnetic force needed to do what it is doing is quite high
gcbryan
Flashlight Enthusiast
Excellent project...the most interesting yet!
People manage to use scooters with a compass on the other wrist...I don't see this as being a problem.
Hannachan, can you describe the parts, where you got them, and how you made it all fit together so well?
People manage to use scooters with a compass on the other wrist...I don't see this as being a problem.
Hannachan, can you describe the parts, where you got them, and how you made it all fit together so well?
A test can only prove it in reality..
Navigate with out torch then repeat the same course while watching the compass with the torch..
Awesome - very simple and elegant :twothumbs
thank you for a lot of responses.
id like to answer the questions which i can answer now.
ill report the details of making later.
*magnet
it is 'Super Strong Rare-Earth RE Magnets' from Dx.
http://www.dealextreme.com/details.dx/sku.13516
or
http://www.dealextreme.com/details.dx/sku.5962
i used 2(ply)x4(place) pieces for the internal ring and 3x4 for the external.
total 20 pieces magnets were used.
*lens
i have used a good many lenses got from the junk camera or SLR lens
as a DIY U/W macro lens.
the lens is one of them. achromatic & about 20mm focus length.
i tested other achromatic lenses for focusable light, the results were very good,
they showed REALLY NO chromatic aberration.
the spot quality is much better than aspheric lens from DX.
*influence on compass
ive first recognized this possible problem when pointed out. thank you.
so i bought a cheap compass today and checked the influence of the
magnets of this light on it.
The light approaching to the compass about 15-20cm distance moves the
magnetized pointer of the compass.
although there may be some solutions for this problem, change magnets arrangement,
number of them, magnet shield etc. , i think the basic solution is difficult.
when checking the compass, the light must be apart 20cm over from the compass.
thank you again.
id like to answer the questions which i can answer now.
ill report the details of making later.
*magnet
it is 'Super Strong Rare-Earth RE Magnets' from Dx.
http://www.dealextreme.com/details.dx/sku.13516
or
http://www.dealextreme.com/details.dx/sku.5962
i used 2(ply)x4(place) pieces for the internal ring and 3x4 for the external.
total 20 pieces magnets were used.
*lens
i have used a good many lenses got from the junk camera or SLR lens
as a DIY U/W macro lens.
the lens is one of them. achromatic & about 20mm focus length.
i tested other achromatic lenses for focusable light, the results were very good,
they showed REALLY NO chromatic aberration.
the spot quality is much better than aspheric lens from DX.
*influence on compass
ive first recognized this possible problem when pointed out. thank you.
so i bought a cheap compass today and checked the influence of the
magnets of this light on it.
The light approaching to the compass about 15-20cm distance moves the
magnetized pointer of the compass.
although there may be some solutions for this problem, change magnets arrangement,
number of them, magnet shield etc. , i think the basic solution is difficult.
when checking the compass, the light must be apart 20cm over from the compass.
thank you again.
Packhorse
Flashlight Enthusiast
Thanks for the answers. I would have thought you would have needed more of those magnets.
I use about 7 of the 8mm ones in my reed switches.
How stable is the lens? Will a good shake dislodge it from the outer rings magnetic grip or will it simple move away then be attracted back?
I use about 7 of the 8mm ones in my reed switches.
How stable is the lens? Will a good shake dislodge it from the outer rings magnetic grip or will it simple move away then be attracted back?
