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  #21  
Old 12-08-2009, 02:05 PM
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pgc hunter
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Originally Posted by casstony View Post
Even in southern Australia mosquitoes can carry nasty infectious diseases. I spray RID on my clothing though I might switch to roll-on after reading this thread. I had no idea of the danger to optics.

Combined Ross River/Barmah Forest Virus notifications for last year = 6500. (263 in Victoria). Both diseases have affected my family.
Had no idea those tropical diseases are found here Still, I refuse to use bug repellant. I think the best solution is to just wear long sleeve jumpers and long pants. Melbourne certainly isn't warm at night in summer anyway so discomfort isn't an issue.
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  #22  
Old 12-08-2009, 03:51 PM
Chris Southby (Chris)
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RID and aerogard are really corrosive. I was into rock climbing a while back and RID and Aerogard were known to eat through ropes, harnesses and other gear. Imagaine the consequences if it was used and got onto the ropes when your 100m off the ground. Not nice.
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  #23  
Old 13-08-2009, 06:12 AM
CoombellKid
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Originally Posted by pgc hunter View Post
Had no idea those tropical diseases are found here Still, I refuse to use bug repellant. I think the best solution is to just wear long sleeve jumpers and long pants. Melbourne certainly isn't warm at night in summer anyway so discomfort isn't an issue.
And there is that new strain of Dengee Fever (not sure how to spell it,
but sounds similar) which is usually found in the tropics. But this strain
they say isn't effected by the cooler climates of the southern states,
and maybe carried south as far as Melbourne.

pgc hunter, your welcome up here anytime would love to see how
you go with several dozen scotch greys on ya back they
have nice long needles that can get through several layers of clothing.
I had a mate stay with us once who said the same thing... mozzies
dont effect me... didn't take long before he was pleading for some RID.
But it's those lil black ones with the black and white strip leg, which
are called the asian tiger that mostly carry the bad stuff. Hell where
I'm live, it isn't unusual to have a couple of varieties attacking you at once.

At the end of the day I think I will be more than a lil careful. But
as mentioned ealier I've been using RID for years. Sprayed both sides
of my hands and the residue has never effected my Pentax XW, Naglers,
U/O HD's, Astronomic filters or telescope parts. But I think I'll be washing
my hands before I pick up my 450D.

Another interesting thing is and is why I never buy Meade products. I
had a Meade #140 barlow that had a very similar problem as that shown
in the first post. It appeared a few months after buying it. It was kept
in my ep case with everything else. It really peeved me off, enough to
never want to buy Meade products again thats for sure.

Cheers,CS

Last edited by CoombellKid; 13-08-2009 at 06:30 AM.
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  #24  
Old 13-08-2009, 06:25 AM
CoombellKid
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Originally Posted by Chris Southby View Post
RID and aerogard are really corrosive. I was into rock climbing a while back and RID and Aerogard were known to eat through ropes, harnesses and other gear. Imagaine the consequences if it was used and got onto the ropes when your 100m off the ground. Not nice.
Jeeeeez that serious, do you have labels warning you about that on your
climbing gear? I thought climbing ropes of today are mostly made of
synthetics resistant to corrosives.

Cheers,CS
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  #25  
Old 13-08-2009, 07:12 AM
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sheeny (Al)
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Quote:
Originally Posted by CoombellKid View Post
Jeeeeez that serious, do you have labels warning you about that on your
climbing gear? I thought climbing ropes of today are mostly made of
synthetics resistant to corrosives.

Cheers,CS
Ropes aren't resistant to much at all. In rescue training, any contamination other than just water, sunlight soap or lux flakes (pure soap), or dirt is considered grounds to condemn a rope.

There used to be a practice of using insulation tape to mark the middle of a rope. We found a box that someone had made a handle for with a piece of old kernmantle rope and then wrapped insulation tape around it... the rope failed! It had only been lifting a few kilos... the adhesive from the insulation tape had softened the rope over many years. Needless to say, we stopped marking the centre of ropes with tape.

Al.
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  #26  
Old 13-08-2009, 07:48 AM
CoombellKid
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Al,

When I was working as a rigger, we were never allowed to leave/store
rigging gear including ropes on concrete floors. The lime in the concrete
had a corrosive effect. Probably why you see alot of machine shops
with sealed concrete floors.

Cheers,CS
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  #27  
Old 14-08-2009, 05:43 PM
Duncan G
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Try flying fox poop, that will disolve ANYTHING.
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  #28  
Old 16-08-2009, 10:40 AM
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Al, I know you're in a better position to see, but looking at your micrographs, I wonder if rather than the surface being etched, the rings are just residue, eg a water soluble salt (not necessarily NaCl) deposit, left after the liquid has evaporated. Have you tried washing gently with a cotton-bud wet with, firstly say plain water? If no success try with a tough of detergent in the water. Failing that I'd Next try ethanol or iso-propanol. Let's face it, you can't do any more damage.
Robert
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  #29  
Old 16-08-2009, 11:43 AM
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No it's not rings of residue... Houghy would've solved that one! It is definitely etched. The formal advice I have got is the EP is not worth repairing (I'm pretty sure Houghy got the same advice). The best remedy may be to simply try to polish the lens surface with optical rouge to remov the coating entirely...

I mainly posted this here so others might become aware of the hazards of usin insect repellents (and sunscreens, etc) around scopes. If it saves someone else from having an EP or scope damaged then it's worthwhile.

Al.
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  #30  
Old 16-08-2009, 07:35 PM
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Fair 'nough. Very sad, but certainly something worth learning from.
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