Olympus-OM
[Top] [All Lists]

Re: [OM] Filters Filters Filters

Subject: Re: [OM] Filters Filters Filters
From: julian_davies@xxxxxxxxxxxxxx
Date: Thu, 13 Mar 2003 08:04:19 +0000 (GMT)
Was it always so? Hoya seem to have been through so many variations, and this 
justification is relatively recent. The corollary of this is that they are 
potentially more prone to going out of round / flat, and jamming on those same 
weak threads of the polycarb lenses.

Julian

>  from:    Tris Schuler <tristanjohn@xxxxxxxxxxxxxx>
>  date:    Thu, 13 Mar 2003 07:31:27
>  to:      olympus@xxxxxxxxxxxxxxx
>  subject: Re: [OM] Filters Filters Filters
> 
> That's interesting if convoluted. It causes me to wonder just what the 
> incidence rate might be for brass (not an especially hard or rigid alloy in 
> its own right) filter threads transmitting enough kinetic energy from 
> impact to damage a lens vis-a-vis filter threads composed of aluminum. Does 
> Hoya cite any figures for that? I know it's never happened to me.
> 
> Meanwhile, no mention at all of snagging with aluminum threads, something I 
> _know_ to be prone with that material in mind.
> 
> All in all I think I'll stick with my B W filters with brass threads. <g>
> 
> Tris
> 
> >Tris, on their webpage, Hoya PROUDLY advertises that it's made from 
> >aluminum, as it will absorb shock instead of transmit it like brass.
> >
> >Albert
> >
> >~~~~~~~~~ Quote from Hoya's website ~~~~~~~~
> >
> >Hoya believes the filter frame is an extremely important part of the 
> >filter as well. Hoya uses machined aluminum frames to hold their high 
> >quality glass. They prefer aluminum to other materials because it is 
> >strong enough to hold up to years of use. Some say that brass is the best 
> >material to use, however, Hoya doesn't hold that view and here is why; 
> >brass is a far more rigid material than either aluminum or the 
> >polycarbonates that are being use in today's lens barrels. This means 
> >that, should the front of the lens get hit, the rigid brass filter ring 
> >will transfer almost all the force of the shock to the lens barrels and 
> >mechanics. An aluminum filter frame will absorb some of the shock by 
> >bending and at a certain point the glass will chip or break, which is what 
> >the filter is supposed to do, protect the lens. Replacing a filter is 
> >always preferable to getting a lens repaired.
> 
> 
> 
> < This message was delivered via the Olympus Mailing List >
> < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
> < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
> 


< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >


<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz