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View Full Version : Something happened to my 400mm!


Tom V
September 30th, 2002, 07:20 PM
I was lucky enough to be given a VIP ticket to the Formula One race at Indianapolis on Sept. 29. The VIP ticket got me into a VIP suite, with a bar, catering, shower, drinks, shaded seating, etc. Being right down next to the track has its advantages, but photographically, it sucked. It is impossible to autofocus through 2 fences and impossible to frame anything without a fencepole in it.

I went down to the infield and found a vantage point without fences, on a hillside that gave me and the other 50 photographers (that found the spot) room to move around.

My Tokina 400mm ƒ5.6 APO was the lens of choice. My Sigma 80-210 ƒ2.8 just did not fill the frame enough, even on the S2.

Between laps I would sometimes look at the LCD, which was hard with the sun shining. The images seemed sharp enough, but zooming in on the LCD image did not impress me with the sharpness. I thought the lens might be dusty, and I kept checking my lenshood.

The Ferraris naturally won. The race was almost boring sorry to say.


Back home, on my 22" monitor, ALL the shots from my 400mm had diffused highlights. UGH! I got the lens out and held examined its glass. Looking through the lens at a desk light, I could see a thin filmy dusty spotted coating that scattered light on inside lens surface(s). It looks pretty uniform, like fine dust - or could it be fungus or is it dust?

The lens would be good for shooting portraits of ugly people for 2 reasons. It naturally diffuses. You can put some serious distance between you and the subject.:p

Should I soak my lens in Windex? (Windex is a popular brand name of an ammonia-based window and glass cleaner in the US):p

I don't know how dust could have gotten in, the lens is usually in a case or in the camera cabinet. I don't know how a fungus could have gotten in or grown, my lenses are fairly dry.

Anyone ever get problem dust or fungus in a lens? Is there an easy way to fix it? I imagine that for the cost to have it serviced, I could buy a new lens.

The piece of art attached shows the fine spots (dust) and arrows point to larger spots that have a clear area surrounding them (fungus?)

Tom V
September 30th, 2002, 07:24 PM
Anyone that read the above, should at least see a Ferrari shot.

This shot looks okay small, but blowing up the original image to see the details reveals diffusion around the highlights.

Duck
October 1st, 2002, 05:29 AM
Tom,

I had an old Vivitar Lens 70-210mm for an old Pentax mount (late 1970's).... the lens had a some fungus growing in it, I took it to a local camera shop and they told me there is nothing they could do, and If I would like to look at some replacement lenses. I took their word for it, I was young and naive... within one month the fungus covered 20% of the lens. I try and keep my lenses in a dry place and I keep some silica packs handy when the humidity gets high (8 months out of the year, here in the hot and humid south).:(

Topngu
October 4th, 2002, 08:31 PM
tomduck again...
Fungus & dust love the lens...that there nature...if the fungus out
side you can clean them with mixe 1/2 windex...1/2 100% alcoholl
or special cleaner....semo lens is worthy to spend few hundred
to clean them...keep them in dry place...

NIKKOR
October 4th, 2002, 09:11 PM
I my other life (younger) I repaired cameras. Fungus in the lenses was not that uncommon. Humidity seemed to be the main problem. Damp basements, unheated closets, trunk of a car with bad seals you name it ...... never had anyone fix one... although one guy had his cut in half and then put into clear plastic... great paper weight / door stop....Basically the glue between the elements has seperated or developed a hair line crack.
Too bad
Don

Tom V
June 20th, 2003, 08:18 PM
My suffering 400mm ƒ5.6 with the internal contamination has been sold on ebay. I was very upfront about the dust or fungus inside, and made it clear (no pun intended) that the lens and the results were defective. I posted pictures of the lens and a diffused glowing Ferrari shot. Someone paid $70 for it. I hope they will find a creative use for it.

A non-winning bidder wrote to tell me that he (a retired engineer from Kodak) was planning to put it in a vacuum oven for about a week to see if he could pull the gunk out. I didn't think that would work, but he thought it was worth a try. If it was dust in the lens, I don't think a vacuum would pull it out. Heat would only melt glue and oils till they ran. If it was fungus, I doubt the fungus would be removed, and even if it did, fungus poop is acid, and etches glass.

Mike Flood
June 21st, 2003, 05:36 AM
Originally posted by Tom Voegeli
Between laps I would sometimes look at the LCD, which was hard with the sun shining. The images seemed sharp enough, but zooming in on the LCD image did not impress me with the sharpness. I



In my opinion the LCD display on the S2 is useless as a means of determining anything other photo composition.
Don't rely on it to evaluate focus or sharpness.

Andre
June 21st, 2003, 12:29 PM
Have you been near the sea? (salty air). Just a thought.

Tom V
June 21st, 2003, 01:15 PM
Originally posted by Andre
Have you been near the sea? ....

I have even swam in the sea!

The lens has never been used near the ocean while I owned it. It was made in Japan, so it probably had a nice cruise over here early in its life.