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Old 04-30-2012, 01:45 AM #17
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Default Re: Props to Dogs Best Friend (The Bushwhacker)

Not too sure either....
I'll try taking pics of it if anyone could identify the problem.

If you want, I'll send the lens back so you could have a closer look.


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Old 04-30-2012, 03:09 AM #18
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Default Re: Props to Dogs Best Friend (The Bushwhacker)

Actually I was asking about AR coatings to
Nikon yesterday. Apparently these lenses are coated with
MgF2, which is susepable to high humidity in terms of mold
growth. I sent a picture of the lens splash, and they
said it most certainly looked like a aspergillius mold corrosion issue that
is often seen on old optics.
this problem couldn't have occured during shipping. It is most likely a result of improper storage at the manufacturing plant or poor storage by the original vendor. Damage like this takes quite a long time. One hint that's it's fungal attack is the round marks on the lens. These are previous fungal -- colonies.
-- from what has been said, we've got lenses in circulation in the laser community that are being sold as new that are actually defective.

So there you have it, directly from the horses mouth.

Again, here is a quote that backs up NIKON's answer to me.

Quote:
"....... Although there are over 100,000 fungus species, two members of the genus Aspergillus are believed responsible for most lens deterioration. Optimum growth conditions for these fungi are relatively high temperature and high humidity, but they are more adaptable to lower humidity levels than most other fungi. Fungal contamination can best be minimized by reducing the humidity of the room either by air conditioning or by installing an infrared lamp above the microscope (at a minimum distance of 150 centimeters or 5 feet). Fungi growing on glass surfaces are not attached by roots and can be wiped off, but unfortunately, residual corrosion marks remain and the original lens performance cannot be recovered and the lens must be replaced. The only effective means to avoid fungal damage to optical components is to prevent its growth in the first place."
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Last edited by Seoul_lasers; 04-30-2012 at 02:27 PM.
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Old 05-01-2012, 03:18 AM #19
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Default Re: Props to Dogs Best Friend (The Bushwhacker)

Thanks for posting that info!

I'm just not so sure when that might have happened to the lens...

Oh well, DBF is very kind to send me a replacement.

Edit:
Quote:
Originally Posted by Seoul_lasers View Post
Adjust your DSLRs f/stop. The higher value for ƒ = focal length divided by the effective diameter. It is essentially a measure in lens speed. Higher speed in bright conditions give a clearer, less saturated photo.
Even if I adjusted the f/ stop, I still had trouble reducing the contrast.
I'll post some shots up.

Cheers!
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405nm Amazon Set
445nm BAMF Link
445nm 2358mW Peak The Bushwhacker by Dogs Best Friend
445nm Fantasy Link
532nm "200mW" DealExtreme Pointer
532nm Amazon Set
650nm Amazon Set
FastTech is the new DX. (Nope, prices have gone up, nevermind!)


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Old 05-01-2012, 05:25 AM #20
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Default Re: Props to Dogs Best Friend (The Bushwhacker)

Check out the thread I posted in the Optics section.


Hmm... what kind of camera are you using?
Also adjust the camera speed. Set to manual mode. Try setting your exposure manually to 1/600 or 1/800. I think you might be on 1/80 or 1/120 ?
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650nm ~350mW DVD 20x diode RyanSoh3 Class IIIb
650nm ~350mW DVD 22x 3.5mm labby build 2010 Class IIIb
532nm 10mW-15mW DPSS Module IR filtered(S.Korea)RyanSoh3 Class IIIb
450nm CarbonFiber ElectricPlasma build 9mm +6W Class IV
445nm 3.49W pk ~3.15W av. Sinner Cypreus II +DTR 9mm 445nm Class IV
445nm RHD Saber Twins 2.7W ~2.35W pk Class IV
445nm A140 module x2 Maxsink Class IV
405nm Daguin Kryton Groove SO6J 700mW build. Class IV
405nm Olike 560mW-600mW pen sold Scopeguy20
Class IV
337.1nm TEA Nitrogen laser project 2011 Class IIIb
---------------------------------------------------
Die4Drivers 1.3v lab laser/projector driver

Laserbee 3.2W Deluxe LPM
ARGMeter 1.1v
Ophir 20C-A sensor

Peregrine 1.5.0 is working now on MacOSX Yay!!

Last edited by Seoul_lasers; 05-01-2012 at 05:26 AM.
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