[LRflex] Re: formula for lens cleaning fluid
- From: David Simms <simmszee@xxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Sun, 17 Jan 2010 15:19:21 -0800 (PST)
Protect your front elements from stray branding irons. Duh !
no more. This cowboy has changed his ways.
Dave
________________________________
From: Steve Barbour <steve.barbour@xxxxxxxxx>
To: leicareflex@xxxxxxxxxxxxx
Sent: Sun, January 17, 2010 3:12:16 PM
Subject: [LRflex] Re: formula for lens cleaning fluid
On Jan 17, 2010, at 2:46 PM, <tedgrant@xxxxxxx> wrote:
> David Simms asked
> Subject: [LRflex] Re: formula for lens cleaning fluid
>
>
>> Thanks for the tip.
>> Now, why the reluctance to use filters ? Do you actually they'll reduce
>> the performance of your R lenses ?
>> I know that filters represent another pair of optical surfaces but, when
>> your lenses are big-time expensive, would you not think that the trade off
>> is worth protecting that front element from dust, accidental abrasion,
>> possible damage from pollutants in the air and so on ? Also, a skylite or
>> UV does filter out wavelengths that lie outside the visible range and
>> which can alter the response of some films.
>> Anyone aware of studies or tests done on the subject ?
>
> OK here it is one more time and if you look in the LUG archives you'll find
> I've posted this at least a half dozen time in the past 10 years. :-)
>
> The only time you need a filter on a lens is to enhance the scene!
> Protection???/ What do you do walk around banging the front element on
> concrete blocks? And as for those sneaky wave length thingies in the sky?
> It's who cares, it's more important to protect your eyes. Leica have never
> suggested using filters on their incredible glass.
>
> Besides if you have a filter on a lens and drop the lens 15 ft to a marble
> floor? Trust me the filter is the first thing to be into a million pieces
> followed by whatever is left of the lens. Been there done it 2 days after
> taking a brand new lens to Europe on assignment!
>
> "Lens cleaning solution?" Here's what LEICA technicians do all over the
> world and in the factory, I've seen them do it in both locations during
> assignments and vists to the factory.
>
> Give the front element a good blow with your breath or a hand rubber blower
> of some kind. That gets any big stuff off. Then breath hard and hot again,
> take a soft cloth. I've used the rear end part of worn out under shorts on
> and off over 50 years on a ton of Leica lenses both M and R from 15mm to
> 800mm. Rub in circles vigorously and maybe another breath or two and bingo a
> beautiful Leica front element.
>
> If you've never seen a Leica technician do this you haven't come close to
> wetting your pants the first time you see one of them do it! If you are a
> newbie to the cleaning they'll make you near have a fit and when they're
> done they'll turn right to your face and give you a great big smile knowing
> they just made you pee your pants! :-)
>
>>>> Now, why the reluctance to use filters ? Do you actually they'll reduce
>>>> the performance of your R lenses ?<<
>
> YES!
>
>>>> I know that filters represent another pair of optical surfaces but, when
>>>> your lenses are big-time expensive, would you not think that the trade
>>>> off is worth protecting that front element from dust, accidental
>>>> abrasion, possible damage from pollutants in the air and so on ?<<<
>
> The filters are a pain in the ass because they create internal reflections
> and if not "prime super expensive filters" they will effect the quality of
> the recorded image.
>
> DUST?
> Unless you happen to be shooting in a sand storm or the desert or a location
> where sand dust is heavily in the air you don't need filters. If you get
> some dust on the front surface blow it off or just leave it and keep on
> shooting.... sometimes if the dust is heavy it actually acts as AN enhancing
> effect to your image. Understanding this comes from experience because the
> chances are you'll not believe any of this anyway even though it comes from
> a professional shooting with Leica's for 60 years! ;-)
>
> The Leica front elements are probably the hardest front glass on any lens in
> the world. And unless you go around like a Klutz banging your glass on brick
> walls and rocks it's likely you can use the same lens for years every day
> and the front element will look just as good at the end of the 50 years as
> it did the first day!
>
> DON'T THINK ABOUT ALL THIS STUFF.............. go take pictures! :-)
I love the story about a piece of hot metal ? gouging your front
element....etc...
Steve
>
> cheers,
> ted
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