The rear gasket keeps the shutter dry, and the body of the lens is pretty well weather-sealed once a filter is applied, although this obviously has its limitations. Apart from that, the lens snaps into focus in the darkest of rooms, and I haven’t ever had to do any microadjusting on my cameras with it, unlike almost every other Canon lens I have ever purchased. There is the odd time in backlit situations where you have to mask part of the lens with your hand in order to grab focus, but I feel that this is perfectly acceptable for a lens this wide. The lens really shines in this department. The focus ring has occasionally become a bit gritty when I have shot in the rain for four or more hours unprotected, but after a 24-hour dry-out it is usually fine. The lens is very light and plastic-feeling however, after 10 years of use in the rain, sand, being bashed into walls at weddings, and generally mistreated, it looks pretty much the same as the day I purchased it. This was the next lens that I added to my bag shortly after, I also purchased a 70-200mm lens to cover the other end of the spectrum. At the time, I owned 35mm, 50mm, and 85mm lenses. It was a great lens for storytelling and adding drama to images. The possibilities that this lens opened up at 17mm when taking photographs in the bride's or groom's house and in the evenings during the party were amazing. I worked with a long-standing and well-equipped photographer in the area who, among other lenses, owned the Canon EF 17-40mm f/4L USM Lens.
Like many of us, this seemed like the easiest way to make money with a camera. When I began in photography, I was shooting weddings.
I have also rented better lenses of a similar nature when I knew that this lens woouldn't be up to scratch for the particular client. I have had a great time working with this lens, and I have shot some billboards, editorials, and point of sale images with it, and my clients have always been happy when I have used it. So, it will probably be popped into one of my kit bags and used for the odd time-lapse or more probably left to gather up dust. My work simply no longer requires this lens as of this weekend. I am certainly not going to be upgrading the lens. I simply don’t need it anymore, so although this is a lifetime review, this is actually the first time that I am retiring a lens rather than upgrading. Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.I am going to start off with the reason that I am retiring the lens first, rather than why I purchased it. Sharp Scientific Calculator Model EL-520W Operation Manual. Hopefully you receive the answer 551.3495107 across the screen. Now, to evaluate, key RCL then F3 then =. Key in 6.5 STO CNST (no ALPHA needed), then 7 STO y^x. Find the result when A=6.5 and B=7.įirst, we need to store 6.5 in A and 7 in B: When 2πA^2 + 2πAB is typed across the screen, press STO then F3.Įxample 2: Assume the formula 2πA^2 + 2πAB is stored in F3. For instance, to key A, press ALPHA CNST B is ALPHA y^x. Now we key in the formula, first pressing the ALPHA key before each letter. We’ll have to rewrite the formula, perhaps with A as the radius and B as the height: Solution: The alpha keys may not include both r and h furthermore, they’re caps. It turns out they can be used to store formulas.Įxample 1: Store, in F3, the formula for the surface area of a cylinder, I’ve always wondered what F1, F2, F3, and F4 do on the Sharp EL-520W. F1, F2, F3, and F4 (the arrow keys) are prominent on the Sharp EL-520W the tutor introduces their use.
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