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Photo Forum / Digital Photography / DSLR Cameras / June 2006Teleconverters
I'd like to buy a 1.4X telextender for a Canon telephoto lens. My choice comes down to the Canon 1.4X or the Kenko 1.4X. Any reason to buy the more expensive Canon other than brand name? ----- Paul J. Gans > I'd like to buy a 1.4X telextender for a Canon > telephoto lens. My choice comes down to the > Canon 1.4X or the Kenko 1.4X. > > Any reason to buy the more expensive Canon other > than brand name? See my post in the other group. Learn how to crosspost*. * = That's what they always tell me when I do the same. :-) >I'd like to buy a 1.4X telextender for a Canon >telephoto lens. My choice comes down to the >Canon 1.4X or the Kenko 1.4X. > >Any reason to buy the more expensive Canon other >than brand name? Nope. The Kenko Pro 300 1.4x is about as good as they get. I use one with my 100-400IS, and there is no visible loss of contrast, or any kind of distortion. It is good enough that I opt to zoom out instead of removing it, unless lighting gets really low and I need that stop back. The Canon TC is only useful with select Canon telephotos; you can use the Kenko with almost any lens, although it starts to get soft and distorted in the corners of a 1.6x-crop if you use wide-angle lenses, wide open, with it. You can use the Kenko with macro lenses, too, to get more magnification  Signature<>>< ><<> ><<> <>>< ><<> <>>< <>>< ><<> John P Sheehy <JPS@no.komm> ><<> <>>< <>>< ><<> <>>< ><<> ><<> <>>< >>I'd like to buy a 1.4X telextender for a Canon >>telephoto lens. My choice comes down to the [quoted text clipped - 12 lines] > wide open, with it. You can use the Kenko with macro lenses, too, to > get more magnification I second this. Be sure you get the pro 300, not just any kenko. You can see many images on my web site. When it says 1.4x or 2x TCs, they are kenko pro 300 TCs: http://www.clarkvision.com Check the birds and bear galleries, as the TCs are used there a lot. Roger > >>I'd like to buy a 1.4X telextender for a Canon > >>telephoto lens. My choice comes down to the [quoted text clipped - 14 lines] > > I second this. Be sure you get the pro 300, not just any kenko. I should have asked this earlier and directly to JPS but what does he mean by "The Canon TC is only useful with select Canon telephotos"? What are the benefits of using the Canon TC on those select lenses? Greg >> >>I'd like to buy a 1.4X telextender for a Canon >> >>telephoto lens. My choice comes down to the [quoted text clipped - 14 lines] >> >> I second this. Be sure you get the pro 300, not just any kenko. >I should have asked this earlier and directly to JPS but what does he mean >by "The Canon TC is only useful with select Canon telephotos"? What are the >benefits of using the Canon TC on those select lenses? I can provide one answer (JPS will, I'm sure, give his). Canon has a page (sorry, no URL) somewhere that lists the lenses that their TC will work with. It is not large and does not include much below a 70-200 mm lens, if I recall correctly. ---- Paul J. Gans >>>>> I'd like to buy a 1.4X telextender for a Canon >>>>> telephoto lens. My choice comes down to the [quoted text clipped - 29 lines] > > ---- Paul J. Gans I've never found it at Canon USA; always at B&H: http://www.bhphotovideo.com/FrameWork/charts/canon2xExtender.html There's another for 1.4x, but I think it differs only in the resulting effect on f/l and magnification. There may be a difference in some notes. SignatureFrank ess http://www.bhphotovideo.com/FrameWork/charts/canon2xExtender.html >I should have asked this earlier and directly to JPS but what does he mean >by "The Canon TC is only useful with select Canon telephotos"? What are the >benefits of using the Canon TC on those select lenses? You get to use it. The Canon 1.4x protrudes in the front, and only attaches to lenses that have a wide hollow for the protrusion to fit into. These is generally only "L" telephotos. Signature<>>< ><<> ><<> <>>< ><<> <>>< <>>< ><<> John P Sheehy <JPS@no.komm> ><<> <>>< <>>< ><<> <>>< ><<> ><<> <>>< >>I should have asked this earlier and directly to JPS but what does he mean >>by "The Canon TC is only useful with select Canon telephotos"? What are the [quoted text clipped - 5 lines] > have a wide hollow for the protrusion to fit into. These is generally > only "L" telephotos. So it's a physical compatability issue. Thanks, Greg Signature"All my time I spent in heaven Revelries of dance and wine Waking to the sound of laughter Up I'd rise and kiss the sky" - The Mekons SNIP >> The Canon 1.4x protrudes in the front, and only attaches to lenses >> that have a wide hollow for the protrusion to fit into. These is >> generally only "L" telephotos. > > So it's a physical compatability issue. Yes, although most generic TCs are optimized/intended for longer focal-lengths as well. In my experience with a Kenko Pro 300 2x, compared to the Canon 2x one, the Canon extender is quite useful while the Kenko one loses huge amounts of contrast with the only lens of mine I tested (EF 200mm f/2.8) which allowed the Canon extender to be mounted for a direct comparison. Bart >>>I'd like to buy a 1.4X telextender for a Canon >>>telephoto lens. My choice comes down to the [quoted text clipped - 12 lines] >> wide open, with it. You can use the Kenko with macro lenses, too, to >> get more magnification >I second this. Be sure you get the pro 300, not just any kenko. >You can see many images on my web site. When it says 1.4x or >2x TCs, they are kenko pro 300 TCs: >http://www.clarkvision.com >Check the birds and bear galleries, as the TCs are used there a lot. Thanks. That helps a good bit. I've seen your bear pictures. They are fantastic! ----- Paul J. Gans > Nope. The Kenko Pro 300 1.4x is about as good as they get. I use one > with my 100-400IS, and there is no visible loss of contrast, or any kind [quoted text clipped - 5 lines] > wide open, with it. You can use the Kenko with macro lenses, too, to > get more magnification Better be careful that the rear glass element of your lens doesn't smash into the teleconverter glass for wide angle lenses. Most documentation suggests not to use a lens shorter than, IIRC, 50mm. SignatureThomas T. Veldhouse Key Fingerprint: 2DB9 813F F510 82C2 E1AE 34D0 D69D 1EDC D5EC AED1 >> Nope. The Kenko Pro 300 1.4x is about as good as they get. I use one >> with my 100-400IS, and there is no visible loss of contrast, or any kind [quoted text clipped - 5 lines] >> wide open, with it. You can use the Kenko with macro lenses, too, to >> get more magnification >Better be careful that the rear glass element of your lens doesn't smash into >the teleconverter glass for wide angle lenses. Most documentation suggests >not to use a lens shorter than, IIRC, 50mm. Thanks. My intended use was with a telephoto, but it is good to know that I could use it with a 50mm or longer. That could save me having to carry too much when just "walking around". --- Paul J. Gans >Thanks. My intended use was with a telephoto, but it is good to >know that I could use it with a 50mm or longer. That could save >me having to carry too much when just "walking around". The manufacturers generally recommend 90mm+ or 100mm+. That's probably based on FF, though, so going a little bit lower with a 1.6x crop should be OK. Better to have a faster lens in the range that you want, though, if possible. As I said in another post, I mainly use the 28-75 with the TC only because I don't like to expose the chamber to the air. My 20D has recently started to get a greasy sensor that grabs dust. Have to clean it with a dry wipe; Eclipse doesn't help pick it up. Signature<>>< ><<> ><<> <>>< ><<> <>>< <>>< ><<> John P Sheehy <JPS@no.komm> ><<> <>>< <>>< ><<> <>>< ><<> ><<> <>>< >>Thanks. My intended use was with a telephoto, but it is good to >>know that I could use it with a 50mm or longer. That could save >>me having to carry too much when just "walking around". >The manufacturers generally recommend 90mm+ or 100mm+. That's probably >based on FF, though, so going a little bit lower with a 1.6x crop should >be OK. >Better to have a faster lens in the range that you want, though, if >possible. As I said in another post, I mainly use the 28-75 with the TC >only because I don't like to expose the chamber to the air. My 20D has >recently started to get a greasy sensor that grabs dust. Have to clean >it with a dry wipe; Eclipse doesn't help pick it up. Thanks. The rest of the story can now be told. Went to B&H today and bought a Canon 70-200mm f/2.8 IS L today. I wanted to also get the Kenko 1.4 extender with it. Sadly, B&H was out of them... By the way, the few shots I've taken with the new telephoto have been just great! ---- Paul J. Gans >Better be careful that the rear glass element of your lens doesn't smash into >the teleconverter glass for wide angle lenses. Most documentation suggests >not to use a lens shorter than, IIRC, 50mm. I use it with the Tamron 28-75 f/2.8, mainly because I don't like to take the TC off the camera for dust reasons. The zoom has plenty of room, I believe. I wouldn't try it with wider lenses, because I really don't need the effect. Signature<>>< ><<> ><<> <>>< ><<> <>>< <>>< ><<> John P Sheehy <JPS@no.komm> ><<> <>>< <>>< ><<> <>>< ><<> ><<> <>>< > The Kenko Pro 300 1.4x is about as good as they get. > The Canon TC is only useful with select Canon telephotos; you > can use the Kenko with almost any lens Thank you for this! I've been interested in getting a teleconverter for my Digital Rebel, but was discouraged when I saw information about converters only working with a small set of lenses. I'll start looking into doing this again, now. Signaturewww.ericschreiber.com >> The Kenko Pro 300 1.4x is about as good as they get. > [quoted text clipped - 6 lines] > >I'll start looking into doing this again, now. Just realize that some of the lenses that won't work with Canon's TCs don't, for good reason; they aren't sharp enough to warrant a TC. A TC, at best, can only magnify what the lens itself is resolving. A lens that is more of a limit to resolution than the sensor is not a good candidate for a TC. Signature<>>< ><<> ><<> <>>< ><<> <>>< <>>< ><<> John P Sheehy <JPS@no.komm> ><<> <>>< <>>< ><<> <>>< ><<> ><<> <>>< >>>The Kenko Pro 300 1.4x is about as good as they get. >> [quoted text clipped - 13 lines] > lens that is more of a limit to resolution than the sensor is not a good > candidate for a TC. For those that know would the Kenko Pro 300 1.4x provide decent results with the 70-200 f/4 L? Greg Signature"All my time I spent in heaven Revelries of dance and wine Waking to the sound of laughter Up I'd rise and kiss the sky" - The Mekons Most of the 3rd-party TCs tend to be pretty soft. The exception is the Sigma APO 1.4x. After that, go with the brand name. The other respondent's comments are also worthy of note. (I've never tried a Kenko Pro 300.) Collin KC8TKA The Sigma APO 1.4x has a protruding front element. Would you mind measuring the diameter of the protruding front for me? I am trying to measure if it will fit. Thanks in advance! > Most of the 3rd-party TCs tend to be pretty soft. > The exception is the Sigma APO 1.4x. [quoted text clipped - 4 lines] > Collin > KC8TKA |
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