![]() Peroxide seems to take off fungus without hurting the coatings, though the fungus itself may have hurt the coatings.Try to work on the lens in a dust-free environment.Do not disassemble anything that you don’t have to disassemble!.The Meopta Belar I used is pretty simple, but even it has a surprising number of parts that you need to remember how to put together again correctly.Avoid lenses that appear to have excessive corrosion.This problem is especially common where steel and aluminum parts, are pressed or screwed together.Some vintage photographic equipment can be seized and impossible to open.This is a snapshot of some of the lens internal before cleaning Notes about lens maintenance (cleaning, lubrication, and adjustment) Just looking on eBay it appears that many of them have more than four aperture blades. You have to find out about the specific lens you are looking at. Even if you find a 50mm f4.5 like mine, I am not sure if it will have a square aperture. Not all Meopta Belar enlarger lenses have square apertures. The Meopta Belar seems to sell for $40 as I write this, and you can find it cheaper if you know how to look - especially if you have some basic tools and are willing to watch a few YouTube videos and figure out how to clean a lens. ![]() Lenses with square apertures are unusual, but not really that expensive or hard to find. With strong colors and contrasty backgrounds, some of the Meopta Belar enlarger lenses can make really cool bokeh diamonds, squares and boxes How to get a vintage lens with a square aperture If you can, with simple shapes, it is often more fun, interesting, and effective to look for lenses with unusual-shaped apertures. The filters are going to restrict the incoming light a lot. One way to try this is to get a set of filters - but I have a future post on how to make your own - so maybe wait! The aperture is the opening in the part of the lens that people often mistakenly call the shutter. To get square bokeh, you need a lens with a square aperture. On the way, we’ll visit some basic photographic concepts like depth of field and looking for a different subject. ![]() This post will give you a basic understanding of what you need to do if you want to start experimenting with square bokeh.
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