This level of fringing is very low and should not be visible, even in large prints or harsh crops from the edges of the frame.Ĭhromatic aberration is the lens' inability to focus on the sensor or film all colours of visible light at the same point. At their worst, fringing just exceeds half a pixel width at f/2 towards the edges of the frame. Simple.įor this review, the lens was tested on a Canon EOS 5D Mark II using Imatest.Ĭhromatic aberrations are virtually non-existent. The taller the column, the better the lens performance.
The scale on the left side is an indication of actual image resolution. Averaging them out gives the red weighted column. The blue column represents readings from the centre of the picture frame at the various apertures and the green is from the edges. Stopping the lens down improves sharpness across the frame, exceeding excellent levels at f/8. At f/2 sharpness in the centre of the frame is already very good and the clarity towards the edges is fairly good. The minimum focus distance of 90cm means this lens isn't overly great for close ups, although magnification just short of half life size is possible with Canon EF25 II extension tube.Īs far as sharpness is concerned, this lens performs well.
Ken rockwell mamiya 7 ii manual#
The manual focus ring is well damped, making it easy to make fine adjustments as necessary. Manual focus adjustments can be made at any time due to the ultrasonic focusing system. Auto focus is very quick under most conditions, maybe hunting a little in low light and low contrast situations.
Ken rockwell mamiya 7 ii series#
It may not be up to the weather sealed standards of Canon's 'L' series lenses, but it is certainly good robust enough to take a little use and abuse.Ī 58mm diameter thread allows the attachment of filters and as focusing is performed internally, this optic is very easy to use with polarising and graduated filters. High quality plastics have been used for much of the lens barrel's construction and the lens mount is metal. Weighing 460g, this lens isn't overly heavy or light, but at only 73.5mm long, it is quite compact and it balances extremely well on the Canon EOS 5D Mark II used for testing. The newer EF 100mm f/2.8L IS USM Macro sports weather sealed construction and image stabilisation along with the features found on the other two optics, but costs around £725.Ĭanon EF 100mm f/2 USM Handling and features The older EF 100mm f/2.8 Macro USM costs around £430 and sports an ultrasonic motor and internal focusing. It sports a silent ultrasonic focusing motor, internal focusing and costs around £380.Ĭanon also offer two macro lenses at this focal length with a maximum aperture of f/2.8, which is a stop slower than this lens.
This compact medium telephoto lens sports a fast f/2 aperture, which will make this lens ideal for low light photography or creative use of shallow depth of field.
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