To be honest I don't know if it "evaporates". But I do know that it
eventually disappears along with the Ronsonol which does evaporate. So
I don't know what else to call it but the important point is that the
oil disappears and the diaphragm starts to work again when it's dry.
I learned this trick from Thomas Tomosy in his 2 book set on camera
repair. He recommends it as a quick and easy repair that may just last
a very long time.
<http://www.amazon.com/Camera-Maintenance-Repair-Book-Comprehensive/dp/0936262869/ref=sr_1_3?ie=UTF8&s=books&qid=1264880312&sr=8-3>
<http://www.amazon.com/Camera-Maintenance-Repair-Book-Comprehensive/dp/0936262583/ref=sr_1_2?ie=UTF8&s=books&qid=1264880435&sr=8-2>
He also has books specific to Nikon, Leica and restoration of classic
and collectible cameras.
Chuck Norcutt
Jez Cunningham wrote:
> " the oil evaporates with the Ronsonol"
> Does it really? Just wondering...
> Jez
>
> On Sat, Jan 30, 2010 at 4:06 AM, Chuck Norcutt <
> chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>
>> Yes, lighter fluid works well. Ronsonol is suggested since it is pure
>> naptha and also comes in a small can with a pinhole spout which makes it
>> easy to dispense small amounts.
>>
>> I don't know anything about the 50 FD lens but it's sometimes possible
>> to just remove either the front or rear group of elements without
>> disassembling the whole lens. On some lenses it's fairly easy to remove
>> the entire rear group by unscrewing a single cell. That allows you to
>> reach in with a tool and drop bits of Ronsonol on the diaphragm and
>> start trying to work it to free it. Of course you may have to do this
>> 100 times but eventually it comes free and the oil evaporates with the
>> Ronsonol. Be sure to hold the lens level so you don't drop Ronsonol all
>> the way through to the back of the front group.
>>
>> Without a total disassembly, cleaning and re-greasing of the helix
>> eventually the problem of migrating oil will return. But you might get
>> several years use out of it before that happens.
>>
>> Chuck Norcutt
>>
>>
>>
>> AS wrote:
>>> I want to take apart a 50mm lens which has stuck blades. Before
>>> jumping into this I wanted to find out if lighter fluid is the catch
>>> all solution to fixing stuck blades. Is there anything else that I
>>> should look for? I'll be working with a Canon FD 50 lens.
>>>
>>>
>>>
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