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03-03-2007, 03:08 AM   #1
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Help with Filter size Please!

Still a newbie, I am trying to figure some thing out. I would like to start experimenting with filters for K100. I have two lenses, Pentax 50-200 and a 18-55. Can I use the 55mm size filters with both lenses? Is there a "filter size for Dummies" way to figue out what filter will fit which lens? Thanks, Jennifer

03-03-2007, 03:59 AM   #2
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The 50-200 uses a 52mm filter, I believe.

Filter diameter is commonly marked on lenses.

To save yourself some money, you can use economical "step-up" adapter rings to allow you to mount larger sized filters on lenses with smaller filter mount diameters. Sort of the photographic equivalent of stuffing paper into the toe of too-large hand-me-down shoes...except it doesn't make you walk funny.
03-03-2007, 04:00 AM   #3
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It tells you on the front of the lens what filter size they take, it'll say "xx mm "

Had a look at Pentax's website - both take 52mm filters
03-03-2007, 05:17 AM   #4
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Hi Jennifer,
A quick and easy way to determine filter size, is to look on the back of your lens cap. The size should be stamped on the back. In your case both lenses use 52mm filters.

03-03-2007, 06:09 AM   #5
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Most of my filters are 58mm, purchased to fit my S*ny H-1.

Most of my pentax lenses have a filter thread diameter of 49mm or 52mm.

So, I have a 49mm-58mm step-up ring and a 52mm-58mm step-up ring that enables me to use my filters on all my lenses.

The only downside is the lens hoods don't fit with the step-up rings in place, but that is a problem that can be managed.
03-03-2007, 08:56 AM   #6
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Consider one of those folding rubber hoods?
03-03-2007, 09:30 AM   #7
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where it's usually seen on lenses.
sigma and pentax DA kit lenses shown

03-03-2007, 11:20 AM   #8
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QuoteOriginally posted by Jennifer Quote
Still a newbie, I am trying to figure some thing out. I would like to start experimenting with filters for K100. I have two lenses, Pentax 50-200 and a 18-55. Can I use the 55mm size filters with both lenses? Is there a "filter size for Dummies" way to figue out what filter will fit which lens? Thanks, Jennifer
If you're realy going to experient with filters you may want to look at the Cokin filter system:

COKIN Creative System - The Holder System - Standard & Pro Holder

It could be less expensive in the long run than buying lots of srew-in filters, and you'd have access to graduated filters and other fun stuff.

You'd need an adapter ring for 52mm lenses.

03-03-2007, 12:18 PM   #9
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really about all the filters you will probably be using are a UV , which i have on everylens and a polarizer and neutral density filters.
get the last 2 in the largest size you can afford and use step up rings to attach them
03-03-2007, 09:24 PM   #10
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Thanks

Thanks for all the help! You are the best resource for my photographic questions and needs, whatever would I do without you?

Roy: What is the advantage for getting a bigger size filter? Just curious. thanks!
03-03-2007, 10:00 PM   #11
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Wow, I just looked into the Cokin System, how neat! Now, I just need to decide on what set to get. Thanks for the great info!
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