21 votes
Accepted

Does using an extender actually change the aperture of the lens?

This is really simple when you think about it. The additional element changes the focal length of the lens, without changing the apparent size of the aperture. That means that the relative size of the ...
user avatar
  • 140k
14 votes
Accepted

What is the blue halo around objects when using a teleconverter?

The blue halo is often referred to as purple fringing. It is caused by chromatic aberration. According to Wikipedia: There are two types of chromatic aberration: axial (longitudinal), and ...
user avatar
  • 26.2k
11 votes

Sigma 150-600mm vs 300mm prime with extender?

With any lens of greater than 300mm focal length on a full frame camera you're probably not going to get results you're happy with shooting handheld. On your 1.6X APS-C camera, the same angles of view ...
user avatar
  • 167k
10 votes
Accepted

How does using a 2x teleconverter with 70-200 f/2.8 affect use?

I have used the exact setup you are using. I found that the 2X Teleconverter iii worked wonderfully with the 70-200 f/2.8 IS II on the 5D Mark iii. I actually tested it in far harder conditions (...
user avatar
  • 34.4k
10 votes
Accepted

Will I not be able to AF with a 2× teleconverter?

You will have to manually focus by moving the focusing ring on the lens. Using the center focus point to focus and then recompose is still considered autofocus. Even if you have manually selected ...
user avatar
  • 167k
8 votes
Accepted

Can I increase 35mm-equivalent focal length with both the crop factor and an extender?

Well, the main thing is that crop factor doesn't really affect focal length. It just affects the field of view by making it narrower. So, what you really have is a 400x1.4x => 560mm lens combination ...
user avatar
  • 49k
7 votes
Accepted

Is there a way to use an extender on a Canon EF-S lens?

The Canon extenders will not physically mount to an EF-S lens. Even if you defeat the keying the front part of the EF 2X (any of the three successive versions) would extend into the rear of the EF-S ...
user avatar
  • 167k
6 votes

Can a teleconverter make lenses designed for a "crop" sensor cover full frame?

Your basic assumption about teleconverters is right. But you haven't done the math: 1/2" is 6.4mm x 4.8mm—doubled is still only 12.8mm x 9.6mm. OTOH it's not unheard-of for tiny format lenses to ...
user avatar
6 votes

What will be my aperture with a 2× teleconverter?

With a ideal 2x teleconverter, you will be 2 f-stops down from what the lens is set to. Think about the basic physics and this should be clear. A 2x teleconverter makes the dimension of anything in ...
user avatar
6 votes

Are there any Teleconverters/Extenders which will work with a Canon Rebel EOS T3 and 55-250mm f/4-5.6 lens?

It depends on how you define "work". And it depends on the lens with which you are working. If it means everything will work the way it does as you are now shooting with only the EF-S 55-250mm f/4-5....
user avatar
  • 167k
6 votes

How can I modify my NIkon D5500 so I can make a vintage lens auto focus?

How can I modify my NIkon D5500 so I can make a vintage lens auto focus? You can't. I learned that using a TC-16A AF Teleconverter 1.6X might help ... Whatever you learned is probably wrong. From ...
user avatar
  • 49k
6 votes
Accepted

How does a teleconvertor affect magnification ratio?

From Nasim Mansurov, the author and founder of Photography Life. Teleconverters do not affect optical characteristics of lenses – they only magnify the center portion of the frame. This means that ...
user avatar
  • 167k
6 votes
Accepted

Can a focal reducer be used with a teleconverter?

Theoretically, optically, it would work (for low-quality values of "work"). Yes, the focal reducer would give an extra stop of light. But because the 2x teleconverter is responsible for 2 stops of ...
user avatar
  • 31k
6 votes
Accepted

How to calculate stops of light lost from a teleconverter?

Although very little (single digit percentages) light is lost to a teleconverter, the ratio of entrance pupil to focal length grows proportional to the magnification of the telecon. For example, if a ...
user avatar
5 votes

Does using an extender actually change the aperture of the lens?

Yes: Remember that the f-stop is a relation between your aperture and the focal length. In theory if you have a f/1.0 50mm lens, that means that you have an aperture of 50mm. If you double the focal ...
user avatar
  • 20.7k
5 votes

Does a teleconverter lose one stop of light from both ends of a variable aperture zoom?

Yes. 5.6 becomes 8.0 If you add a 1.4x extender (teleconverter) you will now have a 140-560mm f/6.3-f/8 lens. Keep in mind that most cameras will only autofocus to a limit of f/5.6 and f/8 will be ...
user avatar
  • 11.4k
5 votes

Will a Sigma 1.4tc teleconverter work with my Canon 70D?

Any teleconverter/extender made for the Canon EF mount will work with your camera. Your question should be, "Which teleconverter would work with my lens." The short answer: It depends on what you ...
user avatar
  • 167k
5 votes
Accepted

Which Teleconverter is best along with my Nikon AF-S DX Nikkor 18-105 mm F/3.5-5.6G ED VR Zoom Lens for Nikon-D7200?

None of them. Here are the reasons why: Teleconverters are designed to be used with telephoto lenses. Most makers of teleconverters state that they are intended with lenses of 70mm focal length or ...
user avatar
  • 167k
5 votes

Are there adapters so I can use my lens converters on a Canon entry-level dSLR?

I will assume no. The first one seems to be a filter mounted converter and you need to have a lens with the specific diameter to fit it. By the looks of it, I don't think any DSLR camera lens are ...
user avatar
  • 502
5 votes

Sigma 150-600mm vs 300mm prime with extender?

tl;dr — Keep the Sigma and learn to shoot it rather than buying a prime instead. From your post, it's tough to tell if you've simply read about unsharp photos with zooms or if you're actually ...
user avatar
  • 20.3k
4 votes

Can I use an Canon 2x Extender on my EF-S 18-135mm lens?

No it is not going to work with the EF-S 18-135mm. I don't know of any EF-S lenses that the 2x extender works with. The lenses are too close to the body and would interfere with the area that the ...
user avatar
  • 45.7k
4 votes
Accepted

What combination of camera, teleconverter, image stacking, or sharpness increase will best improve my moon photographs?

I'm not a moon photographer, but your examples are just about as impressive as I've seen taken with a DSLR and standard camera lens. Some of the things you're looking at may help, but I think they're ...
user avatar
  • 140k
4 votes

How do I choose a teleconverter for my Tamron 70-200 f2.8 and Canon camera?

Unfortunately, I can't recommend using a teleconverter with the Tamron 70-200mm f/2.8 at all (Update in 2020: The most recent Tamron SP 70-200mm f/2.8 Di VC G2 takes a TC better than the older Tamron ...
user avatar
  • 167k
4 votes
Accepted

Nikon Teleconverter compatibility

Teleconverters are designed for use with longer focal length lenses. Many are optimized for a specific focal length range of telephoto prime lenses. There are both marketing reasons why this is so, ...
user avatar
  • 167k
4 votes

What is the use of tele converter? Is it possible that it can be used for all lenses or only for the specific lens?

A teleconverter is basically a magnifying lens used between the camera body and the existing lens, it is also called an Extender. Physical compatibility with a teleconverter depends on the lens being ...
user avatar
  • 1,743
4 votes

I have a telephoto lens made to screw on to another lens. Which one should I attach it to?

The lens you have that goes on the front of another lens is not, technically, a a telephoto lens. That's a specific kind of lens design made to give a narrow field of view. Usually, when we use the ...
user avatar
  • 140k
4 votes
Accepted

How much does the Canon EF 1.4x III Extender affect image quality on an APS-C sensor?

How much an extender affects image quality is dependent upon both the quality of the lens and the quality of the extender. In the case of the EF 1.4X III and the EF 70-200mm f/2.8 L IS II, both the ...
user avatar
  • 167k
4 votes

Can you turn a 60mm macro lens into a 100mm macro lens?

No, an extension tube doesn't really increase the focal length of your lens, it just allows it to focus on closer subjects. Assuming you want to shoot subjects farther away than with the 60mm, to ...
user avatar
  • 16.1k
4 votes
Accepted

Is there a speed booster which will let me use an FX lens on a DX camera with wider focal length and aperture?

The nice thing about teleconverters is that they extend the effective focal length of the lens. That makes it easy to design them with enough thickness in front of the camera's mounting flange to fit ...
user avatar
  • 167k
3 votes
Accepted

What extender can I use with the Canon TS 24mm?

Both Canon 1.4x and 2x extenders work - more information here (search within the page for extender). Additionally, fitting this on a 1.6x crop-sensor body will give an equivalent of 38.4mm focal ...
user avatar

Only top scored, non community-wiki answers of a minimum length are eligible