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Lenses Available at Stonetek.org - Comparison...

jayrob

jayrob

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Well, I don't want to interrupt your work...

We can always discuss what your focal point for the testing was at a later time I guess.

Anyway, looking good! :)
 





N

nikokapo

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jayrob said:
Ok cool...

Not to 'nit pick', but could you define 'infinity'? Do you mean the best visual dot at a certain distance? Because the beam will continue to diverge.

Not trying to be a pain, just trying to get an idea of the exact focus for your testing...
Click to expand...

It can be explained with geometrical optics:

1/x + 1/x' = 1/f

With x being the object's distance to the center of the lens
With x being the image's distance to the center of the lens
With f being the focal point's distance to the center of the lens

If the object x is at the same distance as the focal point f then the image x' is projected at infinity.


More info here: http://en.wikipedia.org/wiki/Lens_(optics)

If you need help with tracing rays let me know :)
 
jayrob

jayrob

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I guess I was just simply asking what were the lasers being focused on? At what distance?

I find that if I focus to best visual dot at 30', that is a great focal point for general pointing. But obviously if you then point at some thing that is 300' away, the dot will be out of focus...
 
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nikokapo

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jayrob said:
I guess I was just simply asking what were the lasers being focused on? At what distance?

I find that if I focus to best visual dot at 30', that is a great focal point for general pointing. But obviously if you then point at some thing that is 300' away, the dot will be out of focus...
Click to expand...

It depends on the focal distance. Every lens has a different (fixed) f distance.
 
jayrob

jayrob

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No no... I have always been ready to learn. That's the best way to be. Believe me, there is so much to be learned here. So I always try to keep a open mind and never want to think that I know everything, because the one thing that I know for a fact, is that I DON'T know everything! :)

Ok well... so as not to over complicate it, when you get a chance FML,

Please let us know at what distance you focus the lasers at, before these tests. :)

:thanks:
 
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Crazy Jay

Crazy Jay

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jayrob said:
No no... I have always been ready to learn. That's the best way to be. Believe me, there is so much to be learned here. So I always try to keep a open mind and never want to think that I know everything, because the one thing that I know for a fact, is that I DON'T know everything! :)

Ok well... so as not to over complicate it, when you get a chance FML,

Please let us know at what distance you focus the lasers at, before these tests. :)

:thanks:
Click to expand...

Excellent show of humility. Just a few more days now and I will be ordering something from you. Well more like 3 things. Dave is putting my 8x in a module for me in a few days. I hope I don't break it
 
jayrob

jayrob

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8X huh? Nice...

Is he putting a driver on it? Just asking because that will be the determining factor in a suitable host choice with the best battery configuration for the driver...
 
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Crazy Jay

Crazy Jay

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jayrob said:
8X huh? Nice...

Is he putting a driver on it? Just asking because that will be the determining factor in a suitable host choice with the best battery configuration for the driver...
Click to expand...

I'm planning on ordering either the 4171 or 3405 with hot option (set to about 300ma). And one of the 405G1 lenses. I can't decide which one I want though. AAA's would be nice because I can get those cheap at walmart but the 4171 looks a little better
 
jayrob

jayrob

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Yes, you are right on track with a battery choice decision...

With a 4171/FlexDrive build, I would install a silicon diode with the 'Hot' option to drop voltage. So you will only have one choice of batteries. 2 X CR123 primaries. You cannot use rechargeable batteries in that set up.

So with that in mind, I would recommend a 3 X AAA set up. Not only because the batteries are much cheaper, but you will have better capacity as well! :)

Also, you will have a choice of using normal AAA rechargeable batteries if desired.

In case you have not seen it, I have a nice side button host that looks more like the 4171 if you like that look. (smaller though) It uses 3 X AAA's. It's also $3 dollars cheaper... Check it out!
http://laserpointerforums.com/f39/fs-new-side-button-host-heatsink-combo-kit-22607.html
 
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Crazy Jay

Crazy Jay

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jayrob said:
Yes, you are right on track with a battery choice decision...

With a 4171/FlexDrive build, I would install a silicon diode with the 'Hot' option to drop voltage. So you will only have one choice of batteries. 2 X CR123 primaries. You cannot use rechargeable batteries in that set up.

So with that in mind, I would recommend a 3 X AAA set up. Not only because the batteries are much cheaper, but you will have better capacity as well! :)

Also, you will have a choice of using normal AAA rechargeable batteries if desired.

In case you have not seen it, I have a nice side button host that looks more like the 4171 if you like that look. It uses 3 X AAA's. It's also $3 dollars cheaper... Check it out!
http://laserpointerforums.com/f39/fs-new-side-button-host-heatsink-combo-kit-22607.html
Click to expand...

Thats a nice one, is it as good at heatsinking than the other two?
I had just read that a 18650 battery can replace 2 cr123's.
The green build I will do next requires one of them as well (your DIY green build). I'm going to take a chance at getting the new 200mw green module from O-like and see if its good or not. :can:
 
jayrob

jayrob

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Yes, the heatsinking is fine...

An 18650 won't fit the 4171. Not the right diameter host. A 17670 can fit, but the protection circuit makes it a very tight fit. Possibly an AW quality battery can work. (17670)

If you want an 18650 build, I have a host specifically for that! (nice slim size too!)
http://laserpointerforums.com/f39/fs-18650-build-kit-easy-assembly-blu-ray-red-43857.html

About the DIY Green kit. Yes, you are correct that the host is designed for an 18650, but in the green modification, you will be using a CR123, or an RCR123. Because the green module will have to take up some of the room inside the battery compartment. And there will only be room for a CR123... (or rechargeable)
 
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Crazy Jay

Crazy Jay

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jayrob said:
Yes, the heatsinking is fine...

An 18650 won't fit the 4171. Not the right diameter host. A 17670 can fit, but the protection circuit makes it a very tight fit. Possibly an AW quality battery can work. (17670)

If you want an 18650 build, I have a host specifically for that! (nice slim size too!)
http://laserpointerforums.com/f39/fs-18650-build-kit-easy-assembly-blu-ray-red-43857.html

About the DIY Green kit. Yes, you are correct that the host is designed for an 18650, but in the green modification, you will be using a CR123, or an RCR123. Because the green module will have to take up some of the room inside the battery compartment. And there will only be room for a CR123... (or rechargeable)
Click to expand...

Would that build be wise with heat sinking an 8x BR diode?
 
jayrob

jayrob

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I've got my 8X in a Pocket Mini host...

Similar to the Pocket Mini, the 18650 host heatsink is held tight to the host. Aiding in the heatsinking properties of the build.

Are you looking for run times longer than a couple of minutes?

I guess I've gotten off topic and thread jacked my own thread... :crackup:

Go ahead and PM me when your ready!
 
FireMyLaser

FireMyLaser

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*frustrated* the beam isn't focused on any particular distance, the dot is set to the smallest diameter I could get 7.5 meters away, if I then choose to point it 100 meters away it will still have the same focus, but the dot will be much larger, but only because of it's divergence. That is what you'd call "focus it to infinity". A green laser comes focused to infinity right out of the box with it's x divergence.

I'm not so good at explaining it.
 
FireMyLaser

FireMyLaser

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Aixiz acrylic (pocket pal):
Beam diameter:
@ aperture: <5mm
@ 7.5m from aperture: ~6mm
Divergence: ~0.133mRad

Aixiz acrylic (dilda):
Beam diameter:
@ aperture: 5mm
@ 7.5m from aperture: ~6mm
Divergence: ~ 0.133mRad



Aixiz 405 glass (pocket pal):
Beam diameter:
@ aperture: <5mm
@ 7.5m from aperture: ~5x5.5mm
Divergence: ~0.033mRad



Aixiz glass (dilda):
Beam diameter:
@ aperture: 5mm
@ 7.5m from aperture: ~5x5.5mm
Divergence: ~0.033mRad



Dilda stock lens (dilda):
Beam diameter:
@ aperture: 5mm
@ 7.5m from aperture: ~5x5.5mm
Divergence: ~0.033mRad



Sure acrylic (pocket pal):
Beam diameter:
@ aperture: 5mm
@ 7.5m from aperture: ~5x5.5mm
Divergence: ~0.033mRad

Sure acrylic (dilda):
Beam diameter:
@ aperture: 5mm
@ 7.5m from aperture: ~7x8mm
Divergence: ~0.333mRad



PHR-reading lens (pocket pal):
Beam diameter:
@ aperture: >2mm
@ 7.5m from aperture: ~3x10mm
Divergence: ~0.599mRad

PHR-reading lens (dilda):
Beam diameter:
@ aperture: >2mm
@ 7.5m from aperture: ~5x10mm
Divergence: ~0.733mRad



LPC-reading lens (dilda):
Beam diameter:
@ aperture: 2mm
@ 7.5m from aperture: ~5x12mm
Divergence: ~0.866mRad
 
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