Pentax Lens Filter Size Chart

Here are the lens diameters and corresponding filter sizes for Pentax lenses.

I’m concentrating here on lenses that accept screw-in filters on the front. Some lenses, such as very wide-angle or fisheye lenses, don’t have a filter thread on the front and can’t accept this style of filter. And some very long telephoto lenses use a system of drop-in filters at the rear of the lens.

Some focal lengths have multiple lenses, so it’s important to match the other parts of the name. Just because they might have the same focal lengths doesn’t mean that they use the same filter sizes.

If you don’t see your lens listed here and want to find out the filter size, it’s often marked on the lens itself. For a more detailed guide, see my post on finding the lens diameter.

A quick way to filter down from this long list is to use the chart’s search bar to narrow it down by focal length (eg. type in “70-200”).

Pentax Lens Codes

As you can see from the tables above, over the years, Pentax has used a bunch of different codes in naming their lenses. I’ve put together a guide separate on how to decode Pentax lens codes to know what they mean.