[LargeFormat] Lens cleaning advice required

[Ken Hough]

There is only one method that will remove grease/oil from a substrate 
without disassembling it. ACETONE. ROR spreads it out, Alcohol 
spreads it too. DO NOT SMOKE while doing it. (this holds true for a 
number of physical activities) Use a Q tip on a paper stick. and 
swirl from the middle. Do it 2 times with new tip. Then use COTTON 
fibre lens tissue and put a "breath" on the lens. Wipe it off. US 
Navy approved method.

On 8 Aug 03, at 15:31, Les Newcomer wrote:

I can almost think of two of them, one was ROR came in a spray bottle
the other was a wet lens tissue  that was very good. It was made in
Germany (maybe even West Germany, to give you an idea how long its
been) but can't remember the name.  It was VERY good at removing oil. 

I heard once that Minolta uses a combination of ether and ethyl
alcohol.  Bet they don't smoke much in that department.


Les

:
>
>> Hi Lads
>>
>> I picked up a fairly cheap (around $360 USD including caps)
>> Rodenstock Grandagon 90mm f6.8 from a local seller recently. Apart
>> from some delamination around one of the internal elements it seems
>> to be in a
> fairly
>> reasonable condition. I've shot some film through it and it seems
>> to be in order.
>>
>> Homever there are some faint oil/grease marks on the glass that I'd
>> like
> to
>> remove. I'm guessing they're probably fingerprint residues(?)
>>
>> Is there an easy way to remove this residue? I tried using an
> off-the-shelf
>> window cleaner but it left some streaking on the glass (removed
>> with water). Any advice on "LF lens cleaning best practice" would
>> be greatly appreciated.
>>
>> Best regards,
>>
>> Gavin
>>
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Ken Hough Photographic Repair
Specializing in Deardorff repair and refinishing
Shutter repair and Lens recementing
Custom machine work
www.deardorffcameras.0catch.com
219-462-0281