fungus in lens
Feb 15, 2019 17:38:16 #
Dikdik
Loc: Winnipeg, Canada
graybeard wrote:
...soaked the 2 lenses in Hydrogen Peroxide overnight, which got rid of most of it, and some elbow grease the rest of it.
Have to be careful... lens coatings are often a few molecules thick and often applied using vacuum technology. The coatings work by reducing reflections, which increases light transmittance. The coatings are also important because they control/affect color rendition. Because of the very thin coating, a powerful oxidiser like hydrogen peroxide can deteriorate/damage the coating.
Once the oxygen has left the hydrogen peroxide... water is left behind which may cause problems.
Dik
Feb 15, 2019 17:53:03 #
Dikdik wrote:
You can buy silica gel at some craft stores or you may be able to scrounge some from window manufacturers.
Dik
Dik
You can buy bulk silica gel on line. Places like Amazon for starters.
I bought a large tub several years ago, filled a couple pairs of white socks and just tied a knot in them. When I feel they should be dried out I put them on a cookie tin in the oven for about an hour at 180°
Feb 15, 2019 18:16:12 #
Rich1939 wrote:
All of the above. Plus the fungus critter can etch the class.
Don
Feb 15, 2019 19:38:26 #
I put everything optical and electrical in a plastic box with a plug in desiccator. once in a while I take the desiccator out of the box and plug it in over night. this has worked well for years, be sure you take the desiccator out of the box or all the moisture absorbed will be expelled back into the box.
God bless Ed
God bless Ed
Feb 15, 2019 19:39:18 #
johnblenko
Loc: Pittsburgh
CHG_CANON wrote:
Keep looking. To protect your own equipment, don't live / store your equipment in a humid environment and never in a leather bag / case for extended periods. Airtight bags with moisture-absorbing silica gel packs can help if you can't move north.
CHG, I’m probably missing something obvious, but what is wrong with a leather bag? Thanks.
Feb 15, 2019 21:06:26 #
Ruggard sells a refrigerator like cabinet with a glass front door which is a dehumidifier. The only way to stop spore growth is to eliminate or reduce the moisture levels.
Feb 16, 2019 05:18:13 #
jayd wrote:
Ruggard sells a refrigerator like cabinet with a glass front door which is a dehumidifier. The only way to stop spore growth is to eliminate or reduce the moisture levels.
The Ruggard dehumidifier/cabinet works great. Bought mine on sale at B&H.
Feb 16, 2019 11:14:25 #
I got a used 35-70 mm F2.8 it has haze and fungus starts to build up too. This lens is so build you can't but some elements apart to clean from a teachnican. If the maturity of lens you looking for have already fungus than leave it alone better to look for other models.
Feb 16, 2019 11:24:06 #
johnblenko wrote:
CHG, I’m probably missing something obvious, but what is wrong with a leather bag? Thanks.
As an organic material leather is by nature's design a breeding ground for mold. It absorbs and holds moisture.
Feb 17, 2019 09:25:17 #
Rich1939 wrote:
You can buy bulk silica gel on line. Places like Amazon for starters.
I bought a large tub several years ago, filled a couple pairs of white socks and just tied a knot in them. When I feel they should be dried out I put them on a cookie tin in the oven for about an hour at 180°
I bought a large tub several years ago, filled a couple pairs of white socks and just tied a knot in them. When I feel they should be dried out I put them on a cookie tin in the oven for about an hour at 180°
PS: I should have thrown this in with the above comment. A cigar humid is designed to for controlling its internal atmosphere and while for cigars that is ~70%, the construction of a quality humidor will also keep humidity out when fresh desiccant is kept in it. A decent sized one will hold a lot of lenses, though probably not your monster telephotos.
Feb 18, 2019 19:09:20 #
Robertl594 wrote:
Does this affect lens coating?
I haven't seen issues with my lenses it's a twice yearly ritual that takes about an hour and a half for all my lenses. I sit in the shade and watching them while they get their anti-fugal treatment. I do not let them heat up since some have special grease inside for the aperture blades.
I don't think this is for everyone. When you have tens of thousands invested in pro lenses and rely on them to make ends meet then it might be worth the time and effort.
Again just my 2 cents so try on your least used and/or easily replaceable lens and 5 minutes max. Hope this helps another starving artist trying to acquire and maintain professional "paint brushes".
Thanks,
Jim Cameron
IG: @jcstudiopics
FB: #jcspics
Feb 20, 2019 00:41:03 #
Dikdik
Loc: Winnipeg, Canada
jcspics wrote:
I haven't seen issues with my lenses it's a twice ... (show quote)
A great lens is a work of art... any fungal deterioration is progressive and with a little care can be eliminated. Fungal growth will convert a nice 'chunk of optics' into an attractive paperweight.
Dik
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