Excerpt: I bought the lens in sep 2010 via internet from Adorama in Nyc. The lens was most propably wrongly assembled as you can't get a even close to sharp photo. When adjusting distance you see only a non focus preview and the final pic is useless. As I tested the lens and found it does not meet any of my need. I got angry and put it away. Today nearly 3 yers later I found it in my closet, got angry and checked the lens again. Total useless.
Excerpt: If your T-mount "breaks in two pieces" check the screws that hold the two parts together: they do come loose. If you loose one (or more...) of these you'll just have to get a new T-mount... Keep a jeweler's screwdriver of the appropriate size in your camera bag so you can tighten these screws as needed.
Excerpt: Back in the olden days when we we used analog capture, we used a trick for determining exposure on the fly called the sunny 16 rule. On a sunny day at F16 you would use the ASA/ISO index as the shutter speed. So if using 200 ASA/ISO then you would be shooting at 1/200 of a second. Open up 2 stops for the shadows. Of course you would need to shift your shutter speed accordingly if you wanted to use a different f stop.Hope this helps.
Excerpt: Do not expect a 100% keeper rate or ease of use here. This lense takes practice and a fair amount of involvement to use, especially when handheld. You can expect great shots out of it though. 500mm and donut bokeh opens many doors!!!
Pros: Donut bokeh, Durable, Easily Interchangeable, Rugged, Strong Construction
Cons: Long and not so bright, Low color saturation, Poor in Low Light
A very long lens with great results if you have patience and a smart camera
31 May 2011
Summary: My first attempt with a mirror lens and was surprised I managed to get some in-focus shots right away. I'm sure the Sony A55 with focus magnifier should get the credit. I'm looking forward to trying it out on the polar bears this September.
Excerpt: Excellent value at the price. However, for ~$500 you could get a Canon 75-300 IS with a noticeable increase in sharpness and not a lot more weight.The setup: Canon 7D on Tripod bright sun, F 6.3 at 1/800 shutter speed using aperture preferred mode. Photographed objects were at 15+ meters.JPG large output (18 MP)Pro Optic image was entirely acceptable. Image from EOS 75-300 zoomed to 300mm and cropped to 500mm equivalent was sharper.
Excerpt: This IS NOT $1000.00 lens so DO NOT expect it to perform like one. I read all the reviews, including the negative ones, and decided to go ahead and buy it. I am glad I did. It is totally manual focus and if you take your time you can get some good shots. I have placed several I took the first day I owned the lens. It works great in sunlight and you can get some great effects with it.
Pros: Consistent Output, Durable, Easily Interchangeable, Strong Construction
Summary: disappointed in so many ways * aperture is too big for the focus ring, practically impossible to focus anything that moves * pooly built, does not lock completely in place with my camera body, nudges about 1mm after the lock "click"ed * poor image quality - this was expected, but it turned out a bit worse than I imagined.
You get what you pay for -- you aren't paying much, but you do get 500mm
J. Pang, Amazon
7 February 2010
Summary: Executive summary: I have had a lot of fun playing around with it the last couple days and I got some shots that I would not have been able to get otherwise. If 500mm is of interest to you and the donut bokeh rings don't drive you up the wall, then this would be a good way to get started. I am definitely not a pixel peeper so these are more just usage impressions than anything.