As I mentioned earlier, use of an extender does reduce the maximum aperture of a lens explanation why further down. Based on the rules of the exposure triangle this means that you might need to shoot with either a slower shutter speed, or a higher ISO if your aperture was within the lost range before you attached the extender.
In those scenarios, light is at a real premium and you also need a fast shutter speed to stop the sporting action. The same goes with the venerable mm f2. NFL games have pretty well lit stadiums but it can be another situation altogether at a college game. These are a couple of times when it might be good to avoid using the extender due to the one stop aperture reduction.
On the other hand, if you are shooting a static subject either with a tripod, or at light levels suitable for easy hand-holding, then the one stop reduction with a 1.
For most people, the biggest disadvantage is the loss in image quality and this is where most of the anti-extender online commentary is centered. Unfortunately, all of the flaws in the original lens become magnified so this means that chromatic aberrations become more apparent, the image becomes softer and there is a reduction in contrast.
A 2x extender will therefore always deliver a softer image because it is magnifying the flaws by 2x instead of 1. This explains, for the most part, the split in opinions over the use of extenders.
As the saying goes….. Well ok, so I added that last bit myself, but you get the picture! The final disadvantage of an extender is that it will cause a reduction in focus speed. How much, depends a lot on the model of the original lens, the camera model and the extender model.
AF systems depend on light for their accuracy so by reducing the maximum aperture of the lens, we reduce the available light for the AF sensor. In-turn, this means that a 2x extender will have a greater effect on the AF speed. From my experience, for many people the 2x crosses a usability boundary with AF speed reduction and very fast paced sports like motor racing.
This table gives you the common available options but before buying an extender you should always consult the manufacturers specifications to verify your intended combination will work.
Essentially we just need to follow the steps that we normally would when thinking about maximising image quality from a lens. The sharper we can get that original image, the less flaws will be magnified.
The main thing is that we want to stop the lens down to increase sharpness and reduce chromatic aberration. Whenever I use an extender, I always try and stop down the aperture at least one stop from where I probably would have had it without the extender.
Since I shoot a lot of sports and wildlife where I need to maintain a fast shutter speed, I usually have to increase my ISO to compensate for the smaller aperture that I need to stop down to. Since contrast is reduced, you also want to avoid using extenders in flat, low-contrast light.
In terms of AF speed and accuracy it all comes down to light levels. Try to avoid using extenders in very low light situations, especially the 2x ones. If your plan is to always rely on using an extender then you might want to re-think it because in those low-light moments, the AF speed will be more greatly affected. Whilst researching this article I realized all of a sudden that I knew why extenders are typically presented in 1.
If you double the focal length in that equation, with the diameter remaining the same, you can see that the f-stop will be affected. In my article, Understanding Aperture, we talked about the progression of f-stops being in multiples of 1. Each increase in f-stop is 1. The reason that 1. Multiplying the focal length by 2x changes the f-stop by two stops because 1.
The powers that be could have chosen any values for the the extenders, but by using 1. Using more than one extender at the same time is generally not accepted to provide acceptable image quality, but once again it depends somewhat on your intended use for the images.
Canon using both the built-in 1. Can you simply crop in on your image instead of using an extender? Less noticeable if you are thinking of using a rather than a big tele prime though. Now, from an image quality standpoint, what people want to know is whether the degradation caused by an extender, is less that that caused by cropping and then re-enlarging that crop to the original pixel dimension. Is there a quality difference between using an extender or an aps-c sensor with a given lens to extend your telephoto capability assuming the same ratio?
This question came in via my personal Facebook page. This is if we just consider optics though. To totally ignore the possibilities that an extender can give you would be a mistake. A few simple adjustments in aperture and shutter speed will go a long way to maintaining the quality of your images.
We may make a small commission from this and it helps to cover the high costs of running a popular website. Dan Carr. Other companies compatible with Canon seem to succeed where Canon products for the exact same use are failing a bit. Have you tried 2x converters from Sigma or Tamron for this purpose???
Thanks in advance for your comments! The 5DS R is over 50mp and…. If they made cameras to last it would be just fine with me. But it seems like DSLRs have gone the way of the laptop. It is maddening. I really love the low light capability of my Canons which is why I went with them in the first place.
But Nikon has really come along with their color saturation in the last 5 years. It is impressive. Nothing is compatible from one brand to the next between those 2 companies though, so…brand loyalty crises pop up everywhere. It also depends on what lenses you use these things on. Some lenses respond better to them than others.
Also, you have to stop down at the very least one stop for good sharpness and two for better sharpness.
That brings you down to F11, which is a problem using it on the A7rii I haven't used it on the A7riii yet and autofocus as it often hunts. We dig into the detail The Nikon Z mm F2. With a versatile focal length range and a fast aperture for low light photography and blurry backgrounds, this lens promises sharp imagery and smooth bokeh with minimal aberrations. How does it actually perform? Find out in our full review. If you're looking to speed up your editing workflow, few pieces of hardware can make complex masking, brushing and cloning jobs easier than a digital pen.
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Submit a News Tip! Reading mode: Light Dark. Login Register. Best cameras and lenses. Started Feb 10, Discussions. Forum Threaded view. Feb 10, Dragon Fighter's gear list: Dragon Fighter's gear list. Reply to thread Reply with quote Complain. Dragon Fighter wrote: I own the 2. Jim -- hide signature Small to medium sized prints would not show any difference. The mm is still a little sharper with the 2.
A surprise here for me. No teleconverters were used in the crops above. The mm range is not the absolute sharpest for the mm. I like the 1. You need to stop down one extra stop to clear up the spherical aberration. The 2. The Sony TCs are pretty expensive, and have limited value for most people. If you can afford the primes that work with these teleconverters, you may as well buy both the TCs to add to your collection just to make it complete. Javascript appears to be disabled in your browser.
Please turn on Javascript in order to fully enjoy this website. Overall, the Sony FE 1. For most of us, the disadvantage second only to the image quality degradation is the loss of 1 stop of maximum aperture. The aperture value f-stop is the ratio of the focal length to the diameter of the entrance pupil. Increase the focal lengths without increasing the width of the entrance pupil, and the lens will have a narrower maximum aperture.
Fast lenses are especially advantaged when using teleconverters. Autofocus performance can be reduced with a teleconverter in use, but the with and without FE 1.
Low light levels increase the autofocus challenge, and the narrower aperture presented by the 1. Three remaining facts are that teleconverters increase the in-use size of the lens, teleconverters increase the in-use weight of the lens, and teleconverters have a cost. I'll address the two minor facts first. Here is the FE 1. The mounted teleconverter shifts the lens weight forward slightly for a tiny change of balance.
Zoom and focus rings also shift away from the camera body very slightly. Sony teleconverters are expensive relative to the rest of the class. Still, the cost of Sony teleconverters is considerably less than the cost of the lens required to gain the target focal length natively if it exists. The Sony teleconverters have protective rubber around the front element to protect the teleconverter and the lens from misalignment issues while mounting.
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