Gear Review: Canon EF 2x Teleconverter MKII

This is a review I hadn’t planned on writing as this wasn’t a piece of kit I was planning on buying! I ended up with one of these teleconverters as at the same time I was buying my 16-35mm lens, I was also looking for a telephoto zoom lens, with the Sigma 150-600mm f/5.6 being at the top of my list.

Some quick maths made me rethink this - I knew I REALLY wanted the 16-35mm f/4L, but getting the 150-600 at the same time, financially, was going to be a bit of a push and after some consideration, I decided to plump for the teleconverter and see how I got on with it. On the front of my Canon 80D which has a crop sensor, paired with my 70-200 f/4L, I can expect to have a focal length around 224-600. (Here’s the maths… (70x2)x1.6 = 224 and (2—x2)x1.6 = 600)).

We can agree this is a whole lot of reach, which is going to be great for a having a go at some wildlife which has previously been out of the range of my 70-200. I will also be able to pick out things in a landscape which have previously been a mere pipe dream and hopefully bag some great shots of the low flying jets as they pass through The Lake District Valleys.

I got mine from MPB.COM, and it’s in “Like new” condition. It set me back £198.55, which is great compared to the in excess of £800 I was going to have shell out for the Sigma. Yes, I have had to sacrifice some reach, (on a crop sensor, 800mm looks like 960mm), but I want to see how this solution works first.

This isn’t the best looking piece of kit; it’s the same off white colour we expect to see long Canon lenses come in and without the lens caps on, it’s a truly odd looking accessory.

Mine has the EF mounting system, (remember, I am still shooting with a DSLR!), and the extender comes with a solid, metal mount which firmly attaches it to the front of the camera.

There is a trade-off to all of this extra reach, namely, attaching your lens to an extender reduces your maximum aperture by 2 stops. So in my case, the max aperture my f/4 lens is going to have is f/8. I don’t mind this for two reasons - 1) I am mainly going to be using this lens in brighter conditions, so will have plenty of light to work with and 2) This lens is really sharp at f/8 so this should translate to better sharpness in the images I produce. I will share some sample images throughout this blog so you can make up your own minds!

How does it work?

Extenders, which are also referred to as teleconverters, work by increasing the magnification of your lens, and then projecting this onto your sensor. A really crude way to think of is it’s like a magnifying glass for your lens.

They come in a limited range of magnifications, usually 1.4x and 2x, though I have seen Nikon ones which have a magnification factor of 1.7x. As you’ve probably worked out, the numbers are the factors your magnification is increased by, so a 100mm lens with a 1.4x teleconverter, will have a theoretical reach of 140mm, the same lens with a 2x teleconverter will have a reach of 200mm and so on. If you have a zoom lens then the whole range is magnified by the same factor. You get the idea.

These pieces of kit however, are not selective in what the magnify. They will magnify everything in your image, which includes any grain or ISO ‘noise’ captured in your image.

What should I consider?

You need to consider what the trade-offs are. Essentially, you will be decreasing your maximum aperture and you are going to sacrifice a bit of sharpness in your final images.

Because you are effectively losing light by having the smaller aperture, you are going to have to compensate by increasing your shutter speed or ISO. You’ll need to bear this in mind when setting up your shots and consider the exposure triangle to make sure you end up with an image, which is in exposure terms, balanced. You can read about this in my blog “A Beginner’s Guide to The Exposure Triangle”.

You might lose some auto-focus functionality by attaching the extender. This so far hasn’t been an issue for me, as I have been taking pictures of landscapes in which the subject is often the light hitting the side of a mountain. Mountain’s aren’t known for being fast moving (if one does start moving quickly, then I would suggest you do the same!), but if you’re using it to shoot sport or wildlife then the amount of images you get which are ‘keepers’ will probably see a reduction compared to shots taken without the teleconverter attached.

The image on the right was taken at 400mm (640mm on a crop sensor), has had noise reduction applied alongside exposure adjustments, masking and colour adjustments. Single exposure, not focused stacked —>

Finally, you should think about what the kit is doing - it is magnifying everything your lens sees and does, so if you have a lens which suffers from, for example, chromatic aberration, this is also going to be magnified and on top this, you are going to lose some contrast as well.

First Impressions of the Canon 2x extender II.

I’ve already taken this out and stretched its legs for half an hour, the first impressions are good but I have identified a couple of drawbacks, but at this stage, nothing bad enough for me to want to return it.

I also got lucky when I was out shooting and instead of just landscapes, I was fortunate enough to see an A400 Atlas flying low level through the Leven Estuary at Greenodd, presumably on it’s way to LFA 17 at Windermere.

One of the first things I noticed was just how much more of a challenge it is to find things in the viewfinder. Especially a moving object like the A400 I just mentioned. It took me a moment to locate it and then to lock focus. I eventually succeeded and have a bagged a couple of shots I am happy with, you can see one of them on the left.

Because it was a bright evening, I didn’t need to add lots of ISO to compensate for the lack of light in now my now f/8 lens. The shot I have ended up with is sharp and because it was shot at ISO 100, it isn’t loaded with image-ruining noise.

The second shoot I went on, saw me heading over to Walney Island for sunset on a very grey evening. Ambient light was not as abundant as I might have liked it to be. Plus, it was sunset, so I was losing light by the second. This resulted in me having to bump up the ISO on my camera to 400.

When I got back to the studio, I did notice the images I had shot using the teleconverter were suffering from more noise than the same images shot on their “native” counterparts. I will point out this wasn’t a lot of noise, but was still more than I could see on the non-extender version.

Prior to the advent of effective noise reduction software/algorithms, this would have been much more of a problem than it is in today’s post processing world. I used Lightroom’s noise reduction panel to get rid of some of this and it did a pretty good job. All of the above being said, the loss of saturation, whilst not catastrophic, did (in my opinion) make the raw files harder for me to edit effectively and I felt like I had lost some of the flexibility I would normally have.

Something else I noticed was having this lens on my camera made it much heavier, so much so, the ball-head on my tripod was really struggling - I would get a shot framed up and then tighten up the ball head, all for it to “drop” when I wasn’t supporting the weight of the camera/lens/extender combination. I have to admit, this could also be a limitation of my tripod and an unfair criticism of the extender, but I had no issues when I was using my 16-35mm or my 24-105. I am going to try a different ball-head before I reach the decision about how often I might want to shoot with it on a tripod, but if you’re using a longer lens which comes supplied with a collar, then using this is a must to help you to balance the weight of the camera against the lens/extender combination. I will update this entry if I manage to solve the problem.

Who is the Canon EF 2 extender for?

I would recommend this to anyone who is wanting to try shooting at much longer focal lengths, but who isn’t ready to spend the money on a good quality super-telephoto lens just yet. There is a big saving to be made if you buy second hand and it can be a good way into trying your hand at genres such as sports and wildlife.

Another thing I would say is this lens is for someone who already owns some good quality glass to put in front of it; if you’re shooting with a lens which you know has some serious flaws then the teleconverter isn’t just going to make your lens longer, it is also going to amplify the imperfections in your lens. These are going to be painfully obvious to whoever is looking at your image. I am lucky to have a full set of Canon L Series lenses which are really high quality, but I also know the characteristics of each of them meaning I know what to look out for when using the teleconverter and this can help me to mitigate any issues before they have a chance to become a problem in the edit.

Pros and Cons

Pros:

• Lightweight

• Small(ish) form factor means it’s likely to fit somewhere in your bag.

• A cost effective option for people who want to try shooting at longer lengths but who don’t want to shell out hundreds of pounds on a huge lens.

• On crop sensors, you end up with “extra” reach owing to your sensor’s crop factor.

Cons:

• Loss of stops of light owing to the max aperture of the lens caused by adding the extender.

• Amplifies everything, including grain and chromatic aberration.

• Some loss of contrast and sharpness in final images.

Summary

If you’re considering making your first foray into genres which require more reach, but don’t have the money to buy the long lens then this could potentially be a safe middle ground. If you’re really into low light photography then you might find the reduction in aperture to (in my case) f/8 to be too constraining. If you’re considering the purchase, then it’s helpful to start by having good lenses which you really understand as any imperfections created by the lens are going to be amplified by the converter.

I think this has been a good purchase for me, it’s opened a world of new compositions, particularly when I want to shoot things I can’t get close enough to in order to create my desired composition. It has given me some more flexibility, perhaps enough to get 2 or 3 extra compositions per location I visit, but I do think this means sacrificing some sharpness and saturation, but not so much to make the ‘project’ a write off.

Will I use this forever instead of buying a dedicated super-telephoto zoom lens (or if I’m feeling flush, a prime - £10,000 for the Canon EF 400mm f/2.8 prime anyone?), probably not. But I am happy enough with the results for the time being which means I am going to have a lot of fun creating something different to my normal shots for many months to come!