My Canon Lens Did A Strange Thing Today.

[snoop69]

Not sure if this is the right section but i could do with some advice regarding
my Canon 90-300 lens.

I was clicking away quiet happily when the view in the viewfinder went
cloudy.

I looked at the front of the lens thinking that it maybe covered in dust when
i noticed that the front piece of glass looked melted.

The only way i can describe it is that it looked like something hot had been
placed on the glass & had melted the inside.

The end of the lens is held on by very small Philips screws so i thought that
i would just remove it & replace the glass with a uv filter.

Anyway,get home & have a look at the lens & its all clear as if nothing
was on it in the first place.

Any suggestions as to what may have happened & also, can i remove the
glass at the front & just use a uv filter?

Thanks in advance.

 

[Bawbee]

Oil? Grease? :shrug:

Age? Cataracts?

 

[Matt]

did you breathe on it

 

[OutLore]

Condensation? Were you near something steamy, or humid?

 

[snoop69]

Oil? Grease? :shrug:

Age? Cataracts?

'Squints' What does that say

I had used a very small amount of Isopopyl Alcohol to clean the lens
approx 2hrs before hand.

did you breathe on it

Nope.

Condensation? Were you near something steamy, or humid?

No, nice dry warm day.

I suppose it could be condensation. I did put the camera down for a few
seconds whilst i removed my rucksack (lens was resting on camera strap).

 

[Bawbee]

...I had used a very small amount of Isopopyl Alcohol to clean the lens approx 2hrs before hand.

Well, I'm not a chemist but, unless you managed to remove all traces of the alcohol, the residue may have reacted with a change in temperature. I'm not sure it's good to use that type of chemical as it may/will damage the lens coating - remind me if you ever try to sell your lenses

Bob

 

[snoop69]

Well, I'm not a chemist but, unless you managed to remove all traces of the alcohol, the residue may have reacted with a change in temperature. I'm not sure it's good to use that type of chemical as it may/will damage the lens coating - remind me if you ever try to sell your lenses

Bob

Interesting - it came in a lens cleaning kit with paper wipes etc

 

[neo2810]

I'm not sure it's good to use that type of chemical as it may/will damage the lens coating

lol.. what a load of tosh... :nono:

Isopropyl Alcohol is the best way to clean a lens... :bang:

 

[Bawbee]

lol.. what a load of tosh... :nono:

Isopropyl Alcohol is the best way to clean a lens... :bang:

Oh, I stand corrected from an expert.

My usual method is a quick blast of exhaled breath and a wipe with a brillo pad. Just shows how wrong one can be :bang:

Stoopid Me :nuts:

 

[neo2810]

I'd hardly call me a lens cleaning expert, I prefer the painstaking healing tool route after the fact

 

[MisterE]

Isopropyl alcohol has been supplied with lens cleaning kits for years. I have a Canon branded kit myself that I've had since around the early 80s or so that has a bottle of it with it. It has no detectable residue and evaporates in a few seconds.