Lens Cleaning

Posted 07/10/2011 - 20:26 Link
I see plenty of information on lens cleaning and they all seem to discuss and show cleaning of front optics. I have noticed that at times the rear optics of one of my lenses looks as if it could be a little dirty, viewed in certain lights/angles/conditions.
Question
When the time comes should the rear optic be cleaned the same as the front optic or should it be left to a professional? Any special precautions or useful links etc would be greatly appreciated.
Regards David
Edited by davidrobinson: 07/10/2011 - 20:38
dougf8
Posted 07/10/2011 - 20:54 - Helpful Comment Link
I use a microfibre cloth or a Calotherm cloth.

Or if its really greasy a drop of Eclipse and a pec pad.
Lurking is shirking.!
Algernon
Posted 08/10/2011 - 09:06 - Helpful Comment Link
I've never used it before, but it supposed to be the best..
ROR... I've just ordered some from Eddie Houston on ebay
and I don't think he'd recommend anything that wasn't
as good as he says it is £15.19 delivered link
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
ChrisA
Posted 08/10/2011 - 09:38 - Helpful Comment Link
Algernon wrote:
I've never used it before, but it supposed to be the best..
ROR... I've just ordered some from Eddie Houston on ebay
and I don't think he'd recommend anything that wasn't
as good as he says it is £15.19 delivered link
The claims for that product are extraordinary. Has anyone used it?
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
.
Posted 08/10/2011 - 09:39 Link
I have never heard of ROR but a quick look on the WEB suggests you may be on to something. Might give it a try myself if you get get good results. Please can you let me know how you get on?
Regards David
Edited by davidrobinson: 08/10/2011 - 09:39
dougf8
Posted 08/10/2011 - 10:27 Link
A stop and a half extra? hmmmmm
Lurking is shirking.!
JohnE
Posted 08/10/2011 - 10:34 - Helpful Comment Link
I follow the usual advice for cleaning both the front and rear surfaces of a lens.
Some dust is actually harder than glass and _will_ scratch the glass or coating it if it is rubbed in to the lens surface with a cloth, so I follow this cleaning procedure:
1) Use rocket blower to get rid of loose dust,
2) Use clean blower brush (i.e. a brush you have cleaned by wiping on a clean cloth to remove any dust from the brush) to very gently remove any stubborn particles and from around the edges. It is a good idea to blow air through the brush bristles (using bulb or a blower) to try to give them a charge to help pick up dust,
3) Then (and only if needed) it is a Calotherm cloth that has been kept in its protective bag.
However, I expect the level of care to increase with the cost of lens!
---
Pentax K30, Pentax K5, Probably too many lenses (if I am honest), Sony ILCE 6000
Posted 08/10/2011 - 10:47 Link
JohnE wrote:
I follow the usual advice for cleaning both the front and rear surfaces of a lens.
Some dust is actually harder than glass and _will_ scratch the glass or coating it if it is rubbed in to the lens surface with a cloth, so I follow this cleaning procedure:
1) Use rocket blower to get rid of loose dust,
2) Use clean blower brush (i.e. a brush you have cleaned by wiping on a clean cloth to remove any dust from the brush) to very gently remove any stubborn particles and from around the edges. It is a good idea to blow air through the brush bristles (using bulb or a blower) to try to give them a charge to help pick up dust,
3) Then (and only if needed) it is a Calotherm cloth that has been kept in its protective bag.
However, I expect the level of care to increase with the cost of lens!
Thanks for all the advice, it's mostly what I have been trying to do, but only to the front glass. I havent dared touch the rear in case I introduced particles into the mechanism. You have given me more confidence but from what you are all saying I must get a better quality microfibre cloth than the one I use at present.
Kind Regards David
karma mechanic
Posted 08/10/2011 - 12:44 Link
The endorsement in that link is so preposterous that for me it weakens any claim the stuff might have - it makes it looks like a scam. Which would be a shame if it is simply a good cleaner.
My own website is www.richardgaddphotography.com

Also on 500px
Algernon
Posted 08/10/2011 - 13:16 Link
karma mechanic wrote:
The endorsement in that link is so preposterous that for me it weakens any claim the stuff might have - it makes it looks like a scam. Which would be a shame if it is simply a good cleaner.
Well he's been selling it for a few years now and considering that his main business is expensive lens conversions/repairs it's highly unlikely that he would bother selling small quantities of lens cleaner that he probably makes less than a fiver on if it wasn't good. You can see from the feedback that he doesn't sell much, but all the buyers rate it highly One feedback comment was:
"Awesome stuff. Crystal clear glass. I won't use anything else now."

I'll know shortly anyway. Just about everything I've tried doesn't clean old lenses properly. If you cool the lens down and breath on it you can see that there is still something on it.

I might buy a pair of these gloves as well. It's almost impossible to put a lens back together without getting fingerprints or dust on it. link
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
Edited by Algernon: 08/10/2011 - 13:18
ChrisA
Posted 08/10/2011 - 13:25 Link
Algernon wrote:
"Awesome stuff. Crystal clear glass. I won't use anything else now."
The thing is, you never know whether the feedback comments are genuine with things like that. FAWK, he just asks people to write some nice comments, or he makes it up.

A stop and a half? For goodness sake... that implies that this 'residual oil' that supposedly needs removing has a filter factor of nearly 3, ie there is almost 3 times as much light getting through the lens after cleaning.

The lens would have to be filthy in the first place to lose a stop and a half, and then you you could make the same claim about any cleaner.
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
.
Edited by ChrisA: 08/10/2011 - 13:32
Pentaxophile
Posted 08/10/2011 - 14:22 - Helpful Comment Link
What's wrong with using a normal microfibre cloth? I don't use snake oil on my lenses ;p
Algernon
Posted 08/10/2011 - 14:36 - Helpful Comment Link
Pentaxophile wrote:
What's wrong with using a normal microfibre cloth? I don't use snake oil on my lenses ;p
They don't remove anything. Cotton seems better I still have some 25 year old Selvyt cloths
(washed many times) and resort to them when microfibre doesn't work.
link

Selvyt have been around for quite some time link

It's only when you take apart completely and then put
back together a 6 element lens that you realize that
your glass cleaning technique is extremely lacking
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
Edited by Algernon: 08/10/2011 - 14:47
Mannesty
Posted 08/10/2011 - 17:04 Link
ROR certainly sounds a very good product and has worldwide distribution too.

Cheaper here than on ebay.
Peter E Smith - flickr Photostream
johnriley
Posted 08/10/2011 - 17:21 Link
Using chemicals of any sort is a last resort and simple Kodak lens cleanher when necessary is at least aimed at the job and not as a multi-pupose clean-anything item. The spiel reminds me of those American ads on satellite TV for various miracle products - setting fire to car bonnets to prove how good a polish it, etc.

Microfibre cloth is all that should be needed, plus a drop of dampening with lens fluid if necessary. Fluids should be applied to the cloth, never directly to the lens surface.
Best regards, John

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