I did a rough measurement with a ruler and counted 4 threads in about
1-1/2 mm. That's 0.375 pitch. I think too fine.
Chuck Norcutt
Wayne Harridge wrote:
>
>
>
>> Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>>
>> Still, it bothers me that the thread pitch seems extremely fine for a
>> filter thread and it especially bothers me that this doesn't seem to be
>> documented anywhere.
>>
>
> Series threads may be a finer pitch than the .75mm used for "normal" filters
> - anyone know for sure ?
>
>> Furthermore, while it might be convenient to have
>> another filter mount ring for use with a reversed lens there's no reason
>>
>> you can't have your 49mm filters installed on the front of the lens even
>>
>> though the lens is reversed. The bellows connecting ring fits easily
>> over my 49mm filters.
>>
>
> I suppose there might be some reason to have the filter at the other end of
> the lens, can't think what for though.
>
> ...Wayne
>
> Wayne Harridge
>
> http://lrh.structuregraphs.com
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