07-01-2020 01:26 PM
For your information, here was the shot that precipitated me not using the extender anymore: pronghorn, sitting still, 500mm + 1.4x extender, f/5.6, ISO 500, 1/3200 sec, on tripod, IS on. I must've tried ~ 20 shots of this pronghorn, trying to get a sharp image, and they were all like this one.
I am sure the extender did its' part. This looks to have front focused by quite a bit. You can check where your focus point was in Canon's DPP. That may have been more tele and less the lens. But, that looks a little too far to be front focusing caused the lens or tele.
I think I would keep OS turn off with this lens on a tripod.
I had a Sigma 150-500 that hadreally bad OS. If I held the lens steady, suddenly you would hear a clunk in the lens, and you lost your subject. Even worse on a tripod. The lens was not bad just as long as you didn't use Sigma OS. They seemed to have fixed the OS stability problem with Sigma 150-600 lenses.
07-01-2020 02:59 PM
07-01-2020 03:06 PM
How does that 1.4X do with another lens? Converters hurt the IQ but it shouldn't hurt it badly enough to make a photograph unusable.
The following three are from shortly after I bought an EF 800 f5.6; the first is the bare lens, the second is with a 1.4X, and the third is a test shot with the 2X which requires manual focusing even on the 1 series since it results in a f11 lens. Image quality definitely drops with extenders but under the right circumstances they can still be a good choice. Contrast and sharpness fall off compared to the bare lens but it still should produce far better results than what you got so something is not working out.
And as Ernie noted, your photos will improve a lot after you get some time with the lens. I have shot with 300 and 400 lenses for some time but the 800 required a lot of learning.
07-01-2020 04:27 PM
"I must've tried ~ 20 shots of this pronghorn, trying to get a sharp image..."
Here is another tip. There is a lot of controversy whether it is better to use a tel-con or just crop to that same ratio in post. You may find the lens with no converter and cropping later is better IQ. I am a never use a tel-con person. I don't like them, never did. I bet I have six or seven setting on my shelf downstairs.
At any rate you must post edit. You must do lens correction. You must shoot Raw. And, you must get closer. Do the test!
07-01-2020 04:34 PM
"I had a Sigma 150-500 that hadreally bad OS."
I had three of those. I have one as we speak. It is a fantastic lens and as sharp as any of the super zooms. Plus it is a bit lighter. The first two have a very long story involving them but to make that story short, this replacement, 3rd try, is a winner.
At the time I was shooting hummingbirds a lot of the time. It was physically impossible to keep a bird in the frame with the OS turned on.
I will say if you find a good one used, they are a great buy because you can get one cheap. However, two out of three, I would certainly try it out very carefully before you lay your money down.
(The last one came directly from Sigma if that matters?)
07-03-2020 01:25 AM
Took a close look at my Canon Extender 1.4x II today, and discovered that it had smudges on both ends of the lens. I cleaned it, and put it on the setup again (Canon Eos 7D Mark II + EF 500mm f/4 L IS USM), and then took it out to take a few photos. Here's an example of the sharpness TODAY with the gear (a couple of rock wrens). A tremendous improvement, I think. Thanks again!
07-03-2020 06:52 AM
Much better! You basically did cataract surgery on your extender
07-03-2020 11:01 AM