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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 15 Jan 2014 (Wednesday) 16:35
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Tiffen or B+W Filter?

 
FarmerTed1971
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Jan 16, 2014 20:46 |  #31

Hogwash. All the aluminum is anodized anyways. There is no such thing as 'bond' in similar materials without a third component in the mix. It all comes down to thread tolerances and thicknesses of coatings. Temperature could also have an effect.

If you start your rotation backwards, as Frodge suggests, you will do it correctly every time and feel any resistance. If the threads are too loose (or tight) I suggest you try another filter.


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Wilt
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Jan 16, 2014 22:44 |  #32

FarmerTed1971 wrote in post #16611804 (external link)
Hogwash. All the aluminum is anodized anyways. There is no such thing as 'bond' in similar materials without a third component in the mix. It all comes down to thread tolerances and thicknesses of coatings. Temperature could also have an effect.

If you start your rotation backwards, as Frodge suggests, you will do it correctly every time and feel any resistance. If the threads are too loose (or tight) I suggest you try another filter.

Say Hogwash to the other photographers who have stated on the web that they have experienced that aluminum filters tend to stick together and are inherently more difficult to unscrew, yet have never experienced similar issues with brass ringed filters. Personally speaking, I can tell you that aluminum thread filters have become very difficult to unscrew from aluminum bodied OM lenses in spite of the fact that I had deliberately tried not to tighten them much.

On this thread http://www.pentaxforum​s.com …ilter-recommendation.html (external link) one person describes,
"mushin
Join Date: Dec 2012
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"I am a metalworker and galling does occur between filters and lens housings (and many other applications). Galling is when two assemblies of the same metal (aluminum, stainless, titanium) are fastened tightly together and develop oxide formation in areas of wear, sometimes resulting in a locked thread. At times it isn't just oxidation. It can be an actual transfer of metal between two assemblies.

" I have had several aluminum filter rings stuck onto the aluminum lens housing tight enough to require a filter wrench to pry them off. You might think that anodizing on these filters and lens housings are uniform but they aren't. In some spots the layer may be thin and as the filter is screwed on the anodizing may wear through. I have some filters where the bare aluminum shows through in multiple spots. It is in these areas that galling can occur. If you see a white residue left on the threads as you crank a stuck filter off then you know what that oxide formation looks like. If you don't think this is a common problem do a search for 'filter stuck on lens'."

The phenomenon is called 'galling', and you can read about it here
http://www.fastenal.co​m …Article%20-%20Galling.pdf (external link)


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johnnysart
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Jan 16, 2014 22:58 |  #33

Thank everybody for your input and expertise.




  
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FarmerTed1971
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Jan 17, 2014 00:20 |  #34

Galling is another thing altogether... and entirely plausible. Aluminum does have a high probability to gall as compared to other metals... that being said if the material is machined properly and the coating is prepared as it should be the incidence will be diminished. Threads on filters are quite small (and now I'm curious as to the thread pitches)... and there is more surface contact so I can see this happening rather easily. Do any filter manufacturers suggest lubricants?


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grayline
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Jan 17, 2014 00:31 |  #35

The B&W is actually better Tiffen uses a polymer to coat their lenses(filters)
B&W has it blended into the glass
there is no coatings . plus B&W has zero ghosting or Flare above 34%
plus you can stack the B&W the tiffen is only single increments


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squiLL
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Feb 03, 2014 09:55 |  #36

grayline wrote in post #16612224 (external link)
The B&W is actually better Tiffen uses a polymer to coat their lenses(filters)
B&W has it blended into the glass
there is no coatings . plus B&W has zero ghosting or Flare above 34%
plus you can stack the B&W the tiffen is only single increments

Sorry, but that is completely false.
Tiffen uses Color Core technology, which is a process that entails permanently laminating the filter material in between two pieces of optical glass.
Also, the CP is front threaded, so you can stack filters on top if you choose to.


Mike Cassara
Marketing Manager - Tiffen Filters

Tiffen.com (external link)

  
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Tiffen or B+W Filter?
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