Help: Lens size > Filter size

Just bought a Canon AE-1 Program, the SLR I really _wanted_ to own back
when I was an 8th grader infatuated with photography in 1982. ;) (Back
then I had to settle for a Canonet 28, but that's another story.)
I'm looking to get a UV filter for the lens, and am a little puzzled
about what size filter(s) to get. The lens is a Canon 50mm. But a couple
filters that came with the set-up are 52mm -- and they fit fine.
I've noticed that I can't seem to buy 50mm filters.
Is 52mm the correct/preferred size for a 50mm lens?
To complicate matters, the set-up also came with a Canon 28mm and a
Vivitar 75-205mm zoom. (Though the Vivitar also has "55mm" printed on
it.)
What's the best scheme for buying filters/adapter rings? Should I stick
to one filter size, and buy adapters for the other two lenses? What
filter size should I get?
Also: What filter size does the Vivitar take? 55mm?
Thanks in advance for any help.
--
CRAIG BAILEY <ccb@floydianslip.com>
Winooski, Vt. USA
www.floydianslip.com

Craig Bailey

Re: Help: Lens size > Filter size

My old Canon FD 50mm f/1.8 and FD 28mm f/2.8 have the same filter
diameter. A friend has my old FD lenses at this moment so I'm
not so sure of the measurements. I believe the filters are indeed 52mm.
If you are not sure of the filter diameters of your lenses
just take them with you to the shop. You can find plenty of
skylight and UV filters for your FD lenses second-hand.
Try those first before buying new.


Robert_pascual

Re: Help: Lens size > Filter size

It should say the thread size on the inside of the lens where the
threads are or on the outside
If $ is an issue buy the filter for the largest lens then get to
adapter rings - best to have dedicated filters though.


Jimbo

Re: Lens size > Filter size

Nitpicking here but they're measured according to the filter mounting
ring--while large diameter front elements will necessarily have large
diameter mounting rings the converse is not necessarily true.
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)


J. Clarke

Re: Lens size > Filter size

That's the cheapest way...buy filters large enough to fit your largest
diameter lens and step up rings for the smaller diameter lenses to fit the
larger filters.
--
dadiOH
____________________________
dadiOH's dandies v3.06...
....a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico


DadiOH

Re: Help: Lens size > Filter size

You're confusing two different dimensions. The "50mm lens" refers to the
focal length.
52mm is the diameter of the front thread. I've seen 50mm lenses with
49mm front threads, 52mm front thread, and 55mm front thread.
You get the filter size that fits the front thread.
If it says 55mm on the front bezel, it takes a 55mm filter.


No_name

Re: Lens size > Filter size

Lens focal length (55mm, 28mm, etc.) and filter size are 2 totally separate
measurements. Focal length is just that, the focal length of the lens. The
focal length of a lens is defined as the distance in mm from the optical
center of the lens to the focal point, which is located on the sensor or
film if the subject (at infinity) is "in focus".
Filters, on the other hand are measured according to the diameter of the
front element of the lens. Wider lenses equal wider filters.
This is, of course, assuming you are using screw-in filters. Larger lenses
(300, 400, 500, 600 mm and larger) use drop-in filters toward the back of
the lens body There are also other systems (Cokin, for example) which use a
mount on the front of the lens into which different square filters (and/or
vignettes) are dropped.
Hope this info helps!!


Joe Friday

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