Filter threads, are they the same?

I believe any 49mm filter will fit any 49mm lens. As will a 62mm filter fit any 62mm lens no matter the brand of either?

The Auto industry has fine/course threads along with the diameter for nuts and bolts. Do I have it right if I were to get the correct filter diameter and call it a day?

Any suggestions on UV filter brands. It looks like Hoya is a big name when scrolling through ebay for a filter kit.

Sean

Sean -- don't get too enthusiastic about filters as in most cases you are better off without unless you are buying the ones that cost nearly as much as a secondhand 50 f1.7.

The lesser ones can contribute to a lessening of IQ even though they may look clean and perfectly transparent.

I make exceptions for my expensive glass (70-200 SSM) or some of the ones with a very prominent front element -- but the latter can be the hardest to fit a filter on.

Welcome to Dyxum.

Edited by brettania - 11 November 2007 at 06:54

Were going to be shooting in the desert alot. Race trucks make a huge amount of dust. This is the reason for the filter/protection. Hoya or B+h it is. I was hoping I could get away with the a cheapy $7 unit off ebay...

Thanks for pointing me in the right direction. 62mm with out the "C" which depicts coarse threads. (62mm may not be a large enough lens to have the "C" option) Hoya or B+H.

To repeat an earlier post and to clarify another.

In the larger filter sizes (86 and above) there are at least two thread pitches. There may be three. Listings on B&H for 86mm include 86C, 86M and 86. (86 and 86M might be the same thing, as listed by a clueless vendor.)       

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Metric threads do come in several pitches, just like SAE. In fact often three pitches rather than usually two in SAE.

The only difference is that metric is specified in width of one thread rather than threads per fixed length. 1/4-20 is 1/4 inch dia, 20 threads per inch also called coarse.   1/4-28 is 28 threads per inch and called fine. 10-1.5 is 10mm dia 1.5mm per thread. 10-1.25 and 10-1.75 are also common. In automobiles at least the pitch is always noted in the manual, since you will fine different pitches on the same car depending on use.

But camera filter threads are certainly not standard bolt threads. They are much much finer, perhaps unique to camera lenses and filters. This may also be true of the fine machine screws used to assemble cameras and lenses, since you cannot buy them retail. (If you know a source please tell me.)      
       

Seems to becoming a long thread here :7)

All Hoya filters above 40.5mm have 0.75mm thread pitch.



B+W lists their 86,95,105,112 and 122mm filters as having Metric 1.0mm thread pitch. Below these all are .75mm pitch until you reach 43mm where both .05 and .75mm pitches are available.

SK Grimes has a little page showing all the complexities.

Filter Threads

Way more complicated than necessary and as I said before, for 99.5% of lenses used on DSLRs will have a standard 0.75mm pitch and any filter of the right diameter will fit.

Pete

Hi Analytical:

So the Bigma threads are 1mm pitch?
It would be interesting to see what the large KM lenses use.

Pete

What would be a good quality budged minded brand in your opinion?