![]() The likelihood of a lens developing oily aperture blades depends on several factors: I am sure that Canon and Nikon have their own troublemakers as well. For example, the Minolta 50mm f/1.4 I will clean in this article is known to develop sticky aperture blades. Some lenses are more prone to this than others. The oil can flow or evaporate onto the aperture blades, but it can also end up on the glass elements or other internal components or the lens. However, because lubricants generally have a lower viscosity at higher temperatures, regular exposure to high temperatures can accelerate the degradation.Īside from frequent exposure to high temperatures, a one-time exposure to extreme temperatures might also be sufficient to cause the grease to separate. This is usually a slow gradual process caused by the natural degradation of the grease. The solid and liquid components of the grease separate, and the liquid oil component makes its way to the aperture blades and causes them to stick together. This happens when the grease on the focusing helicoid breaks down, either due to age, or due to exposure to high temperatures. The most common cause of sticky aperture blades is oil on the blades. A disconnected or worn out return spring.There are a variety of reasons why aperture blades can get sticky, or even completely stuck. Why do aperture blades get sticky or stuck? For this I will clean the blades on a Minolta 50mm F1.4 as example.Īn iris diaphragm opening and closing. I will also take you through the step-by-step process of cleaning oily aperture blades. In this article I will explain the possible causes of sticky and stuck aperture blades, how you can identify the cause, and how you can fix and prevent the problem. Stuck aperture blades are not only caused by oily blades, but also by mechanical problems in the lens. Usually when this happens, the blades are stuck wide open. In bad cases the aperture blades can get completely stuck and can not stop down at all. Oily blades cause the iris diaphragm to close too slowly, resulting in overexposed photos. Sticky aperture blades usually occur when the blades become oily. ![]() ![]() An example of this is discovering in the middle of a shoot that your lens has sticky or stuck aperture blades. ![]() One of the worst things as a photographer is finding out that your gear does not work in a crucial moment. ![]()
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