Teleconvertor issues

John wells

John wells

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Evening all

I wonder if someone can help, I bought a 2x for canon, not an actual canon one though

When I initially tried it, it appeared to connect with a 50mm lens, but I've just hooked it upto my 70/200 and all I'm getting is err messages.

Any suggestions?

John
 
Possibly be a bit more helpful to know what camera and lens combination.
 
Canon 6d with the 70-200 f4 with this converter attached

IMG_1475775303.958357.jpg
 
Hi Rob, firstly it flickers on the LCD and then er 01 I think
 
Weird thing was the shots with and without were the same?
 
John wells said:
Weird thing was the shots with and without were the same?
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Surely not. A teleconverter is basically just another lens which magnifies the image produced by your "main" lens. So it shouldn't be possible for the images with and without to be the same, unless your teleconverter has no glass in it.
 
Appear to have glass in it but when I look at the files in the camera they appear no closer, this is really my first time using it so am I missing. Something?
 
John wells said:
Evening all

I wonder if someone can help, I bought a 2x for canon, not an actual canon one though

When I initially tried it, it appeared to connect with a 50mm lens, but I've just hooked it upto my 70/200 and all I'm getting is err messages.

Any suggestions?

John
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Full AF operation with the TelePlus MC7 AF 2.0X is possible using camera lenses with open apertures of F2.8 or brighter. Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the camera’s AF sensors. (Manual focusing may be necessary when using lenses with smaller open f-stop values than that given above.)
 
Hi wegi

I was trying to focus manuallyand the light was good as was contrast, I'm wondering if it's a connection issue
 
John wells said:
Hi wegi

I was trying to focus manuallyand the light was good as was contrast, I'm wondering if it's a connection issue
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ok, try resetting the camera, meaning, take lens off, and then the battery off, wait a mimute or two,and try again...
 
Thanks Wegi will try tomorrow when I've got light to try it out as well, really want to get this working so i can go to mach loop next week
 
Just sounds like clear connections aren't being made, find this with my Kenko extension tubes on the D3.
 
Another thing, connect the extender first to your lens, and then the camera......
 
crofter said:
Kenko don't recommend using micro focus adjustment when using their teleconverters,My 70d locks up if I have mfa set for any lens,may have something to do with your problem.
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Yup, I had weird problems with my first Kenko 1.4 with one of my lenses and that turned out to be the culprit, worth checking.

Should definitely be seeing a pretty huge visual difference with the teleconverter though, no idea why things look the same!
 
I use MF on my 7D with Kenco 1.4 and cannon 100-400. It has to be set for individual lens. The 100-400 on its own is set to -2. If I connect the lens and converter the camera will not recognise the adjustment. With the converter and lens I have set +4 . Once set the camera recognises the adjustments for each set up automatically and there are no problems.
 
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So i have to remove all my lens MA? As I haven't set one for this lens. The error code is 01, I recorded the flickering thing it does but can't attach the video, I think it is a loose connection to the body as there is a bit of play in there which when a lens is connected i don't get
 
As others have said, Canons won't AF (except in Live View) when the lens f/number is higher than f/5.6 - and you're at f/8 with the TC on an f/4 lens. See page 95 of the handbook.

A way around this is to tape over a couple of the lens-to-camera communication pins to fool the camera (google) but that doesn't change the aperture that is still at f/8, so even if it works AF will be slow and possibly inaccurate.
 
Personally I would return it and get the 1.4, it will not AF on your camera, it might by taping the pins but it will be slow and it will hunt , the IQ will not be brilliant and even if you get to make it work you will be disapointed.
 
crofter said:
Someone on another forum with these symptoms found a couple of loose screws on the mounting plate of the Kenko,tightened them up and cured the problem,hope this helps.
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I too kept intermittently getting 'No lens' errors when using one of a set of Kenko extension tubes. The error vanished if I pushed the lens firmly towards the camera body.

It took a really close inspection to see that the mount plate was a tiny bit loose. I loosened off all of the screw then carefully re-tightened them. Not had a problem since.
 
John wells said:
Thanks Wegi will try tomorrow when I've got light to try it out as well, really want to get this working so i can go to mach loop next week
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Not a good idea to use any 2x TC on an F4 zoom for such an event, yet alone a 3rd party one. If you don't have a longer lens, it'll be better to shoot without the TC and crop if necessary.
 
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eccles said:
Not a good idea to use any 2x TC on an F4 zoom for such an event, yet alone a 3rd party one. If you don't have a longer lens, it'll be better to shoot without the TC and crop if necessary.
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Do you mind if I ask why as others have reported it working well?
 
John wells said:
Do you mind if I ask why as others have reported it working well?
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On most DSLRs, an f/8 lens will not AF at all - the system switches out. On others it may function, even if it's not supposed to, but will be slow and unreliable. There are some high-end DSLRs that will AF at f/8, usually with the centre AF point only.
 
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John wells said:
Do you mind if I ask why as others have reported it working well?
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As Richard says, AF will be unreliable even with a Canon 2x TC. You can get away with cheaper 1.4x TCs on many lenses with a bit more reach than by cropping alone, but I wouldn't bother with a cheap 2x even with high end cameras that can handle AF at f8. And if you're using an expensive prime and/or high end camera then it'd be a waste to degrade the image with anything but an OEM teleconverter. The aspherical elements in OEM TCs by Canon and Nikon are expensive to produce but the improvements that they bring over most 3rd party TCs are well worth the extra cost.
The Canon 70-200mm F4 is a decent lens that would work well with a Canon 1.4x TC. It deserves better than a Kenko.
 
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