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Reading mode: Light Dark. Login Register. Best cameras and lenses. Started 3 months ago Discussions. Forum Threaded view. Reply to thread Reply with quote Complain. Chuck wrote: Is there a substantial difference in pixel count for a full frame camera that uses a 1.
Reply Reply with quote Reply to thread Complain. As Sittatunga said, the basic answer is yes. In actual use, the answer can depend on your equipment. I set the camera on a tripod and photographed a lens test print with and without the converters. In Lightroom I cropped the 1X images to the same framing as the converter images. F Forum M My threads.
You may also like. Our favorite gear, rewarded: DPReview Awards Latest sample galleries. Canon EOS R3 sample gallery. Nikon Z9 production sample gallery. See more galleries ». Take shooting from a safari vehicle for an example. You spend all day tracking an animal and then when you find it, the vehicle parks up so you can observe. With a prime lens you are really left with only a couple of possible composition options and a vertical and horizontal shot.
Using an extender will double the number of potential different shots you can get if you are stuck shooting from one spot! If you are shooting field sports like football then you can also get added reach when the play moves to the opposite end. Even a mm with a 1.
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. Just saw your comment here on the f4 IS. I just got the Canon f4 IS after a bunch of research. Very happy as my first semi-big prime. You say no 2. Would you use 1. I felt this was the best option when needed getting to 5. Plan on using the 1. Wanted to try outdoors local wildlife with canon L. Being very iso and aperature sensitive from low light and having dealt with 3rd party lenses hunting in low light, I wanted a canon prime.
Canon F4 IS was the choice. Have not tried 1. Just couious you thoughts for 1. Have seen good shots and good results online. But your needs and my needs are probably vastly different. Try it for yourself and evaluate the images. Make sure you also test the AF speed though. The main one is an understanding of autofocus. Autofocus systems in a camera require a lot of light to work accurately. When you add a 2x extender to a lens, it takes away a lot of that light, which is why AF with a 2x is considerably slower than without it.
There might be some 3rd party solutions that can hack this to work with the 2x extender, but the autofocus will not be very good at all. Sigma on the other hand have been pushing lens development very hard, and there are Sigma lenses that are on a par with Canon ones, but cost less.
If both the Canon lens and the equivalent third party lens have the same max aperture, their ability to autofocus with a 2x will be the same. I am not a pro here, and using Nikon D Nikkor 5.
Not sure when I got it, but it has helped, once I figured out what was going on. When ever I used the 2x converter, everything would overexpose by 2 stops. Once I figured this out, I was able to adjust the Exposure Compensation down 2 stops and all works fine, including all the other converter use headaches. Certainly the sensor should be getting less light, and maybe in doing so, the meter is asking the lens what it is set to, and it gets back mm at f8, and gets some indication that there is a 2x converter, boosting the meter level up, causing the over exposure.
So to override the camera computer, I have to compensate down two stops? Any thoughts? This makes zero sense, although if you Google it there are plenty of people having such issues over the years, with third party extenders. Many citing issued with light angle and focusing screens. Essentially, all bets are off once you switch to a third party option like Kenko, especially an old cheap one.
Totally weird! Cheers Patrick! If you ever get to the bottom of it all, let me know! Hi, I just wanted to say I am seeing this exact problem of overexposed images with a second hand Kenko 2x teleconvertor. I am planning to use two 2X teleconverters behind my lens. If I set the aperture of my lens to 2. Thanks for spotting the typo! Hi Dan…I enjoyed your article. I am an amateur photographer and frequently shoot my kids soccer games.
I have a 5dii and use a 2. I generally get pretty good shots but would like a little more reach. Assuming a fairly sunny day around noon and using the 2x converter what shutter speed and iso would you recommend? I assume i would want the camera to maintain the lowest fstop 5.
I also shoot with shutter priority…. Thank you in advance for your help and all the best. For underwater photography, there can be good reasons for using a teleconverter with very wide angle lenses, even including a fisheye lens.
For example one may want to narrow the field of coverage while keeping the better corner performance behind a dome. How would I calculate the change in diagonal field of view of the Nikon mm fisheye at 15mm on full format degrees at 15mm with a 1. Will a TC even fit on that lens? On a recent trip to the Galapagos islands I rented a Canon and 1. I found the extender to result in too many missed shots for a few reasons you mentioned 1 slow autofocus, 2 light reduction, 3 camera shake in motorized raft.
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