- #BACKYARDEOS SLOW CANON 7D MANUAL#
- #BACKYARDEOS SLOW CANON 7D ISO#
- #BACKYARDEOS SLOW CANON 7D SERIES#
Unfortunately, with the extender fitted, that means using F11 or narrower apertures to get anything like decent image quality. The Canon 100-400mm L IS has a reputation for not being tack sharp wide open and these test images demonstrate that. With the converter in place, I took pictures at F8 and at F11 and without the converter at F5.6 and F8. To be kind, I chose a day with good natural light and took several images using each lens combination, in order to choose the sharpest of each. To assess image quality for the tests, I took some pictures of Greenham Water Tower, which is about half a mile away from this location. This results in soft images, which aren't tack sharp, particularly at wide-open F8 aperture settings. Of course, using a 1.4x extender will always reduce image quality (IQ) to a degree and although the Canon EF 1.4x III extender is excellent, there is inevitably going to be IQ degradation.
#BACKYARDEOS SLOW CANON 7D SERIES#
In my opinion, it's because auto focus would be so slow and inaccurate! If you want auto focus with the Canon 100-400mm + 1.4x extender, then the choices are between the Canon 1D series and the Canon 7D Mk II (which I used in these tests). But there is clearly a sound reason why auto focus is disabled by Canon, when using this combo. Some people advocate taping the pins on the extender, which then allows auto-focus to work on these older camera bodies.
#BACKYARDEOS SLOW CANON 7D MANUAL#
Many Canon camera bodies (including the original Canon 7D Mk I) will not auto-focus with this combination, which means the added inconvenience of using manual focus - which is not really practical for birding, when the subject is constantly moving. One of the first issues to consider if you're planning on using the Canon 100-400mm lens with a 1.4x extender is one of Auto-Focus.
#BACKYARDEOS SLOW CANON 7D ISO#
Interestingly, the Canon 7D Mk II is much improved at low ISO too, there are cleaner edges and borders on subjects, with less noise on background textures. I own both bodies, so have done direct comparisons. So, when it comes to high ISO noise, a photograph taken at ISO6400 on the new 7D Mk II has the edge on a picture taken at ISO3200 with the old 7D. The Canon 7D Mk II is at least one stop better than the old 7D at high ISO and images are cleaner and noise (when it appears) is more manageable. That said, the Canon 7D Mk II, which I use as my main camera body, works well right up to ISO6400 for birding, thanks to a brand new 20.2MP CMOS sensor and the improved DIGIC 6 processor. Some would argue that even F5.6 creates a challenge for low light photography! As a result, low light performance suffers with the extender. The addition of the extender gives a very useful 560mm, but at a cost, as you'll end up with F8 at wide open aperture setting. In this article I take a look at the performance of the older Canon 100-400mm lens when fitted with the latest Canon 1.4x III extender (aka teleconverter). Like many Canon 100-400mm f4.5-5.6 L IS USM owners who do some birding, I have always longed for a bit of extra 'reach', to be able to get that all-important shot of a more distant rare bird.
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