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 ...
xiota's user avatar
  • 27k
13 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 ...
Michael C's user avatar
  • 175k
11 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 ...
Michael C's user avatar
  • 175k
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 ...
inkista's user avatar
  • 52.1k
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 ...
Michael C's user avatar
  • 175k
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 ...
inkista's user avatar
  • 52.1k
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 ...
scottbb's user avatar
  • 32.7k
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 ...
PhotoScientist's user avatar
6 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 ...
OnBreak.'s user avatar
  • 20.5k
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 ...
Mike Sowsun's user avatar
  • 12.2k
5 votes

Can I build my own focal reducer by reversing a teleconverter?

Can I build my own focal reducer by reversing a teleconverter? ... mounting its optics backwards into a mount adapter ... Focal reducers and teleconverters are specialized lenses, and flipping lenses ...
xiota's user avatar
  • 27k
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 ...
Michael C's user avatar
  • 175k
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 ...
Michael C's user avatar
  • 175k
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 ...
Andreas's user avatar
  • 522
5 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 ...
Michael C's user avatar
  • 175k
5 votes

Will a Nikon AF-S TC-17E II teleconverter work with a 70–300 AF lens on my D3400?

The TC will work with the camera. But the D3400 has no AF drive motor, and a TC will not add that either... so it would be manual focus only. Additionally, the TC has a blocking tab that prevents it ...
Steven Kersting's user avatar
4 votes

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

No - that's still using AF (auto-focus). It will no longer work because your lens will become a 140-400 F8, and that's just too dark for the AF sensor to function. So you'll have to use MF i.e manual-...
Steve Ives's user avatar
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, ...
Michael C's user avatar
  • 175k
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 ...
Rob's user avatar
  • 1,813
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 ...
mattdm's user avatar
  • 143k
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 ...
Michael C's user avatar
  • 175k
4 votes

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

Assuming no functional issues, if 4/5 shots are as good as your sample image, I'd suggest keeping the Sigma 150-600mm lens because it has image stabilization and appears to perform very well. I would ...
xiota's user avatar
  • 27k
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 ...
xenoid's user avatar
  • 21.3k
3 votes
Accepted

Can the Sigma TC-1401 1.4x Teleconverter be used with Canon lenses?

I've now had a chance to rent both the Sigma TC-1401 and a Canon EF 70-200 f/4 L, and can confirm they do work together - at least using my 700D.
exterrestris's user avatar
3 votes
Accepted

Will a lens extender be helpful for wildlife photography with a 70-200mm lens and APS-C sensor?

There aren't many Canon lenses I would recommend using with a teleconverter/extender for wildlife/action/sports. In fact, aside from Super Telephoto prime lenses, there is only one: The EF 70-200mm f/...
Michael C's user avatar
  • 175k
3 votes

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

Kenko Video Tele Converter KVC-2011 2.0x Nope. Video cameras tend to have smaller sensors and smaller mounts, so this won't work. Even if you could mechanically couple it, you'd get vignetting from ...
inkista's user avatar
  • 52.1k
3 votes

How to determine which lenses are good at testing teleconverter quality?

You can figure out whether the TC is the major cause of loss of sharpness by measuring lens resolution with and without TC. Measure lpmm using a resolution test chart without TC. If you max out the ...
xiota's user avatar
  • 27k
3 votes
Accepted

Sigma 150-600mm + 1.4x TC

Better get the Sigma, the lens is designed for it The 1.4 TC will make it a 840mm lens, but also a F/9 lens. So: The AF will struggle, assuming it works at all, forget it for birds in flight (but ...
xenoid's user avatar
  • 21.3k
3 votes

Will a Nikon AF-S TC-17E II teleconverter work with a 70–300 AF lens on my D3400?

Nikon's AF-S Teleconverter Compatibility list doesn't list either that camera or lens, so I'd say no.
Tetsujin's user avatar
  • 23.3k
2 votes
Accepted

Optical quality of using one v two teleconverter

There are no absolutes when comparing disparate optical designs. It always comes down to the actual performance of each system. It's quite possible that two very high quality 1.4X teleconverters ...
Michael C's user avatar
  • 175k

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