Hi. I use the Canon 300mm F.4L with a 1.4 pt1 Teleconverter on my Canon 7D. The lens on its own is at its best at F8. I was wondering what aperture people think is best when attached to the 1.4 TC? Still F8 or down to 9,10? Any thoughts appreciated!
Jun 20, 2012 08:10 | #1 Hi. I use the Canon 300mm F.4L with a 1.4 pt1 Teleconverter on my Canon 7D. The lens on its own is at its best at F8. I was wondering what aperture people think is best when attached to the 1.4 TC? Still F8 or down to 9,10? Any thoughts appreciated! Richard Cook
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Jun 20, 2012 11:09 | #2 i've got the 1.4II and that lens I sometimes use on a 7D. I've gotten good results from f8 to f11.
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bobbyz Cream of the Crop 20,506 posts Likes: 3479 Joined Nov 2007 Location: Bay Area, CA More info | Jun 20, 2012 11:51 | #3 Usually 1 stop when using any TC. Fuji XT-1, 18-55mm
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amfoto1 Cream of the Crop 10,331 posts Likes: 146 Joined Aug 2007 Location: San Jose, California More info | Jun 20, 2012 12:08 | #4 Depends upon how picky you are....  1969 Porsche 917K Turn 2, 2009 Rolex Monterey Historic Races, Mazda/Laguna Seca Raceway. EF 300mm f4 IS lens with EF 1.4X II, effective f5.6 aperture. EOS 50D camera at ISO 200, 1/1600 shutter speed. Handheld or monopod, available light. ...but improves stopped down a little (f8, f11)...  EF 300mm f4 IS lens with EF 1.4X II teleconverter, effective f8 aperture. EOS 5D Mark II at ISO 1600, 1/250 shutter speed. Handheld or monopod, available light (no flash). Except that background bokeh sometimes isn't quite as nice because OOF highlights tend to get a little busy. Wide open the aperture is perfectly round. Stopped down it's octagonal (newer lens designs such as used on the 300/2.8 IS and 70-200/2.8 IS use curved aperture blades that make for a little smoother background blur). The image example below isn't using the teleconverter, but it's largely the same with or without it... The busy background in this image needed quite a bit of toning down in Photoshop (added blur and burned down the highlights), due to the way the lens rendered it at f5.6...  EF 300mm f4 IS lens at f5.6. EOS 7D at ISO 400, 1/2500 shutter speed. Handheld, avail. light. Alan Myers
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1Tanker Goldmember  4,470 posts Likes: 8 Joined Jan 2011 Location: Swaying to the Symphony of Destruction More info | I find i get the best results between f/6.3 and f/9 with my Sigma 1.4x. Kel
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