topic Re: Dots on 70-200 Lens in EF & RF Lenses

Dots on 70-200 Lens

justen — Sat, 02 May 2015 23:30:08 GMT

New forum user here, searching didn't bring up this issue so pardon if this is a repeat question.

I was cleaing my 70-200 2.8 today and noticed all these tiny dots, they look like they are on deep inside lenses. It doesn't look like dust or fungus, they look more like bubbles in the glass. Anyone experienced this before? The lens is about two years old, I've never noticed them before but they have to be held at a certain angle.

Re: Dots on 70-200 Lens

ebiggs1 — Sun, 03 May 2015 17:09:54 GMT

"I was cleaing my 70-200 2.8 today ..."

Just exactly what does this mean? I have seen many lenses destroyed from "cleaning"!

Re: Dots on 70-200 Lens

RobertTheFat — Sun, 03 May 2015 17:25:44 GMT

@ebiggs1 wrote:
"I was cleaing my 70-200 2.8 today ..."

Just exactly what does this mean? I have seen many lenses destroyed from "cleaning"!

Sometimes we read too much into such statements. I suspect that he was merely saying, "I was wiping the grease and dust off of the business end ..."

Re: Dots on 70-200 Lens

justen — Mon, 04 May 2015 01:50:12 GMT

Yes, just cleaning the front and rear of the lens. Nothing extravagent.

Just as a background on me, I've been a professional TV cameraman for 25 years. I've cleaned a lot of expensive lenses.

Re: Dots on 70-200 Lens

jazzman1 — Mon, 04 May 2015 03:25:57 GMT

@justen wrote:
Yes, just cleaning the front and rear of the lens. Nothing extravagent.

Just as a background on me, I've been a professional TV cameraman for 25 years. I've cleaned a lot of expensive lenses.

Hi Justen. Can you share with me your process for cleaning your lens??? Since you're a pro, I wondered how you diid it when needed. Not being a smart _ _ _, really would like to know in case I ever need to do it.

Re: Dots on 70-200 Lens

RobertTheFat — Mon, 04 May 2015 11:16:16 GMT

@justen wrote:
Yes, just cleaning the front and rear of the lens. Nothing extravagent.

Just as a background on me, I've been a professional TV cameraman for 25 years. I've cleaned a lot of expensive lenses.

Re: Dots on 70-200 Lens

ebiggs1 — Mon, 04 May 2015 13:47:18 GMT

"Yes, just cleaning the front and rear of the lens.

... I've been a professional TV cameraman for 25 years. I've cleaned a lot of expensive lenses."

I am not trying to be disrespectable of your position but ......

"I have seen many lenses destroyed from "cleaning"!"

I have been in the business for 40+ years. You need to send your lens to Canon.

Re: Dots on 70-200 Lens

jazzman1 — Mon, 04 May 2015 14:24:28 GMT

I'm not asking about throughly cleaning lenses, sensor's etc. I'm just talking about dusting off, lightly cleaning the outside of the lens, not my camera. I've read many different methods and cleaning solutions. I have microfiber cloths, a brush pen and blower, Zeiss wet cleaning wipes, but have been reluctant to use any them. I try not to get my eye piece or lens dirty, but they may need wiping off from time to time. I would only clean my lens if absolutely necssary for the reasons Biggs states. I won't fool with my camera lens/sensor at all.

Re: Dots on 70-200 Lens

Artsiva — Fri, 21 Jul 2017 02:59:05 GMT

I noticed this too. They are consistently sized tiny dots all over the surface of some inside element in the lens assembly. Could it be part if the auto focus mechanism.... I don'tdont .

It was noticed while dusting the lens and when held against a lighr source, in the infinity setting (dots come in full focus).

I wish a Canon technical specialist would respond to this rather than speculative and dismissive comments that are of little value.

Re: Dots on 70-200 Lens

RobertTheFat — Fri, 21 Jul 2017 03:36:41 GMT

@Artsiva wrote:
I noticed this too. They are consistently sized tiny dots all over the surface of some inside element in the lens assembly. Could it be part if the auto focus mechanism.... I don'tdont .

It was noticed while dusting the lens and when held against a lighr source, in the infinity setting (dots come in full focus).

I wish a Canon technical specialist would respond to this rather than speculative and dismissive comments that are of little value.

Canon technical specialists don't normally frequent this forum. We're just users who try to help. But Canon has a support line you can call. I think it's 800-OKC-ANON, but I'm not certain of that. I think it's posted somewhere on this Web site.

You've noticed, I assume, that the most recent previous post to this thread was more than two years ago. Ernie Biggs and I are still around; some of the others, not so much.