Filter rings are generally made from either aluminum or brass. Lens barrels, particularly the threads to which filters attach, are usually made from aluminum. Filter rings, particularly aluminum ones, can sometimes "bind" to the aluminum lens...

{"title":"Stuck Filter Removal","post_url":"http:\/\/basiccamera.blogspot.com\/2008\/06\/stuck-filter-removal.html","feed_url":"http:\/\/basiccamera.blogspot.com\/feeds\/posts\/default?alt=rss","author":"mybloglog9908cfdbbfc6ee17835d","date":"2008-06-30 08:13:00","summary":"Filter rings are generally made from either aluminum or brass. Lens barrels, particularly the threads to which filters attach, are usually made from aluminum. Filter rings, particularly aluminum ones, can sometimes \"bind\" to the aluminum lens..."}

Certain manufacturers, most notably Rollei and Hasselblad, have created their own systems of bayonet mount for filters. Each design comes in several sizes, such as Bay I through Bay VIII for Rollei, and Bay 50 through Bay 104 for Hasselblad.

{"title":"Filter Sizes & Mountings - Bayonet Round Filters","post_url":"http:\/\/basiccamera.blogspot.com\/2008\/06\/filter-sizes-mountings-bayonet-round.html","feed_url":"http:\/\/basiccamera.blogspot.com\/feeds\/posts\/default?alt=rss","author":"mybloglog9908cfdbbfc6ee17835d","date":"2008-06-30 08:03:00","summary":"Certain manufacturers, most notably Rollei and Hasselblad, have created their own systems of bayonet mount for filters. Each design comes in several sizes, such as Bay I through Bay VIII for Rollei, and Bay 50 through Bay 104 for Hasselblad."}

Graduated filters of a given width (100 mm, 67 mm, 84 mm, etc.) are often made rectangular, rather than square, in order to allow the position of the gradation to be moved up or down in the picture. This allows, for example, the red part of a sunset...

{"title":"Filter Sizes & Mountings - Rectangular Filters","post_url":"http:\/\/basiccamera.blogspot.com\/2008\/06\/filter-sizes-mountings-rectangular.html","feed_url":"http:\/\/basiccamera.blogspot.com\/feeds\/posts\/default?alt=rss","author":"mybloglog9908cfdbbfc6ee17835d","date":"2008-06-30 07:58:00","summary":"Graduated filters of a given width (100 mm, 67 mm, 84 mm, etc.) are often made rectangular, rather than square, in order to allow the position of the gradation to be moved up or down in the picture. This allows, for example, the red part of a sunset..."}

For square filters, 2" x 2", 3" x 3" and 4" x 4" were historically very common and are still made by some manufacturers. 100 mm x 100 mm is very close to 4"x4", allowing use of many of the same holders, and is one..

{"title":"Filter Sizes & Mountings - Square Filters","post_url":"http:\/\/basiccamera.blogspot.com\/2008\/06\/filter-sizes-mountings-square-filters.html","feed_url":"http:\/\/basiccamera.blogspot.com\/feeds\/posts\/default?alt=rss","author":"mybloglog9908cfdbbfc6ee17835d","date":"2008-06-30 07:46:00","summary":"For square filters, 2\" x 2\", 3\" x 3\" and 4\" x 4\" were historically very common and are still made by some manufacturers. 100 mm x 100 mm is very close to 4\"x4\", allowing use of many of the same holders, and is one.."}

The most common standard filter sizes for circular filters include 30.5 mm, 37 mm, 40.5 mm, 43 mm, 46 mm, 49 mm, 52 mm, 55 mm, 58 mm, 62 mm, 67 mm, 72 mm, 77 mm, 82 mm, 86 mm, 95 mm, 112 mm and 127 mm. Other filter sizes within this range may be hard to..

{"title":"Filter Sizes & Mountings - Threaded Round Filters","post_url":"http:\/\/basiccamera.blogspot.com\/2008\/06\/filter-sizes-mountings-threaded-round.html","feed_url":"http:\/\/basiccamera.blogspot.com\/feeds\/posts\/default?alt=rss","author":"mybloglog9908cfdbbfc6ee17835d","date":"2008-06-30 07:38:00","summary":"The most common standard filter sizes for circular filters include 30.5 mm, 37 mm, 40.5 mm, 43 mm, 46 mm, 49 mm, 52 mm, 55 mm, 58 mm, 62 mm, 67 mm, 72 mm, 77 mm, 82 mm, 86 mm, 95 mm, 112 mm and 127 mm. Other filter sizes within this range may be hard to.."}