teleconvertors

[Don]

Folks

I have a 400mm L USM f5.6 lens and use it with a canon 2 times
teleconvertor on my 10D and like the results. However, the autofocus
doesn't function due to aperture change etc (2 stops). I hope to use the
same lens with a 1.4 series 2 canon extender. Does anybody know if this
will have the same autofocus issue with my 10D.

Secondly, any experience with Kenko pro series compared to the Canon?



--
Don From Down Under

[Ken Chandler]

Don wrote:
> I have a 400mm L USM f5.6 lens and use it with a canon 2 times
> teleconvertor on my 10D and like the results. However, the autofocus
> doesn't function due to aperture change etc (2 stops). I hope to use
> the same lens with a 1.4 series 2 canon extender. Does anybody know
> if this will have the same autofocus issue with my 10D.

Hi Don,

As far a I know the 10D requires f/5.6 or wider apertures in order for the
centre AF point to be enabled as the more accurate cross-type sensor.

The 400mm f/5.6 L USM + the 1.4xTC gives you f/8 which I think would revert
the centre AF point back to the non-cross type.

If you are in Sydney, I have a 1.4x Canon TC, perhaps we could meet up for
you to give it a test drive sometime.

Regards,

Ken

[AU Digital POTD]

"Don" <mackie.don@bigpond.com> wrote in message
news:rFs7d.11265$5O5.1197@news-server.bigpond.net.au...
> Folks
>
> I have a 400mm L USM f5.6 lens and use it with a canon 2 times
> teleconvertor on my 10D and like the results. However, the autofocus
> doesn't function due to aperture change etc (2 stops). I hope to use the
> same lens with a 1.4 series 2 canon extender. Does anybody know if this
> will have the same autofocus issue with my 10D.
>
> Secondly, any experience with Kenko pro series compared to the Canon?
>

The 1.4x will still take you to f8 and I think this is where the AF starts
having problems... so you may be out of luck.

I looked closely at the Kenko pro series of converters and although very
good, the Canon ones had the edge in image resolution/sharpness. This was
based on test images of the same subject, shot through both converters.

[Don]

Ken

thanks for the kind offer, I'm in Adelaide so no can do. How do you find the
Canon, is it worth the money compared to a Kenko or the like?

regards

Don

"Ken Chandler" <news@kenchandler(dot)com> wrote in message
news:415e5e8d$0$23896$afc38c87@news.optusnet.com.a u...
> Don wrote:
>> I have a 400mm L USM f5.6 lens and use it with a canon 2 times
>> teleconvertor on my 10D and like the results. However, the autofocus
>> doesn't function due to aperture change etc (2 stops). I hope to use
>> the same lens with a 1.4 series 2 canon extender. Does anybody know
>> if this will have the same autofocus issue with my 10D.
>
> Hi Don,
>
> As far a I know the 10D requires f/5.6 or wider apertures in order for the
> centre AF point to be enabled as the more accurate cross-type sensor.
>
> The 400mm f/5.6 L USM + the 1.4xTC gives you f/8 which I think would
> revert
> the centre AF point back to the non-cross type.
>
> If you are in Sydney, I have a 1.4x Canon TC, perhaps we could meet up for
> you to give it a test drive sometime.
>
> Regards,
>
> Ken
>
>

[Ken Chandler]

Don wrote:
> Ken

>> If you are in Sydney, I have a 1.4x Canon TC, perhaps we could meet
>> up for you to give it a test drive sometime.

> thanks for the kind offer, I'm in Adelaide so no can do. How do you
> find the Canon, is it worth the money compared to a Kenko or the like?

The only thing I have to compare it to is an older Tamron 2x TC that used to
always give me grief with exposures on L lenses.

I've been very happy with the 1.4x TC, mine is the series 1. I use mine
with a Canon 70-200mm f/2.8 L IS.

I've only heard good things about the Kenko Pros but never used one, sorry

KC

[PlaneGuy]

You will not* be able to autofocus with the EF1.4x II and the 400/5.6 on the
Canon 10D, as the AF is diabled if the maximum aperture is greater than 5.6.

This limitiation is put in by the body recgnising the maximum aperture of
the lens (it is reported to the body as data from the lens). As such, a lens
like the Sigma 50-500 reports its max aperture at the 500mm end as 5.6,
instead of the actual 6.3.

Now, there is a technique that has been reported on the web about taping
certain pins on the EF II converters, such that the multiplyer is not
reported to the body. Third party converters such as the Kenko and Sigma
converters do not report their presence to the camera.

Now, the problem with doing this, is that whilst the camera tries to
autofocus, it really doesn't do a very good job because of the the lack of
light.

Good luck.

[Rob]

Ken Chandler wrote:

> Don wrote:
>
>>Ken
>
>
>>>If you are in Sydney, I have a 1.4x Canon TC, perhaps we could meet
>>>up for you to give it a test drive sometime.
>
>
>>thanks for the kind offer, I'm in Adelaide so no can do. How do you
>>find the Canon, is it worth the money compared to a Kenko or the like?
>
>
> The only thing I have to compare it to is an older Tamron 2x TC that used to
> always give me grief with exposures on L lenses.
>
> I've been very happy with the 1.4x TC, mine is the series 1. I use mine
> with a Canon 70-200mm f/2.8 L IS.
>
> I've only heard good things about the Kenko Pros but never used one, sorry
>
> KC
>
>

I have the Kenko Pro for the Nikon and found it better than the Nikon's.

rm

[peter Geran]

"Rob" <mesa@mine.com> wrote in message
news:415ea9ff$0$2410$61ce578d@news.syd.swiftdsl.co m.au...
>
>
> Ken Chandler wrote:
>
> > Don wrote:
> >
> >>Ken
> >
> >
> >>>If you are in Sydney, I have a 1.4x Canon TC, perhaps we could meet
> >>>up for you to give it a test drive sometime.
> >
> >
> >>thanks for the kind offer, I'm in Adelaide so no can do. How do you
> >>find the Canon, is it worth the money compared to a Kenko or the like?
> >
> >
> > The only thing I have to compare it to is an older Tamron 2x TC that
used to
> > always give me grief with exposures on L lenses.
> >
> > I've been very happy with the 1.4x TC, mine is the series 1. I use mine
> > with a Canon 70-200mm f/2.8 L IS.
> >
> > I've only heard good things about the Kenko Pros but never used one,
sorry
> >
> > KC
> >
> >
>
> I have the Kenko Pro for the Nikon and found it better than the Nikon's.

Which Nikon TC did you use ?

Rgds..............Peter
>
> rm

[macropod]

Hi Ken,

One thing to watch out for with the Canon and Sigma TCs is that their front
elements sit well forward and could strike the rear element on some lenses
(especially zooms at the wide end of their range). Also, the housing for the
front element on both of these is so wide that you simply can't fit some
lenses onto them. The Tamron Pro is designed differently so that neither of
these issues appears to be a factor. That may apply to the Kenko Pro too,
but I have no information on that.

Cheers


"Ken Chandler" <news@kenchandler(dot)com> wrote in message
news:415e5e8d$0$23896$afc38c87@news.optusnet.com.a u...
> Don wrote:
> > I have a 400mm L USM f5.6 lens and use it with a canon 2 times
> > teleconvertor on my 10D and like the results. However, the autofocus
> > doesn't function due to aperture change etc (2 stops). I hope to use
> > the same lens with a 1.4 series 2 canon extender. Does anybody know
> > if this will have the same autofocus issue with my 10D.
>
> Hi Don,
>
> As far a I know the 10D requires f/5.6 or wider apertures in order for the
> centre AF point to be enabled as the more accurate cross-type sensor.
>
> The 400mm f/5.6 L USM + the 1.4xTC gives you f/8 which I think would
revert
> the centre AF point back to the non-cross type.
>
> If you are in Sydney, I have a 1.4x Canon TC, perhaps we could meet up for
> you to give it a test drive sometime.
>
> Regards,
>
> Ken
>
>


---
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Checked by AVG anti-virus system (http://www.grisoft.com).
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[Ken Chandler]

PlaneGuy wrote:

> You will not* be able to autofocus with the EF1.4x II and the 400/5.6
> on the Canon 10D, as the AF is diabled if the maximum aperture is
> greater than 5.6.

Thanks Planeguy.

The center AF point needs f/2.8 or wider to be a cross-type, not f/5.6 a I
previously stated.

KC

[Rob]

peter Geran wrote:
> "Rob" <mesa@mine.com> wrote in message
> news:415ea9ff$0$2410$61ce578d@news.syd.swiftdsl.co m.au...
>
>>
>>Ken Chandler wrote:
>>
>>
>>>Don wrote:
>>>
>>>
>>>>Ken
>>>
>>>
>>>>>If you are in Sydney, I have a 1.4x Canon TC, perhaps we could meet
>>>>>up for you to give it a test drive sometime.
>>>
>>>
>>>>thanks for the kind offer, I'm in Adelaide so no can do. How do you
>>>>find the Canon, is it worth the money compared to a Kenko or the like?
>>>
>>>
>>>The only thing I have to compare it to is an older Tamron 2x TC that
>
> used to
>
>>>always give me grief with exposures on L lenses.
>>>
>>>I've been very happy with the 1.4x TC, mine is the series 1. I use mine
>>>with a Canon 70-200mm f/2.8 L IS.
>>>
>>>I've only heard good things about the Kenko Pros but never used one,
>
> sorry
>
>>>KC
>>>
>>>
>>
>>I have the Kenko Pro for the Nikon and found it better than the Nikon's.
>
>
> Which Nikon TC did you use ?


Thinking at the time it was the 201. There was a much bigger glass in
the Pro 300 Kenko. and something about the number of contacts.

I still have the kenko which I use on my 80-200 but adding the TC slows
down the AF motor and I usually manual focus it.
>
> Rgds..............Peter
>
>>rm
>
>
>

[Rob]

macropod wrote:

> Hi Ken,
>
> One thing to watch out for with the Canon and Sigma TCs is that their front
> elements sit well forward and could strike the rear element on some lenses
> (especially zooms at the wide end of their range). Also, the housing for the
> front element on both of these is so wide that you simply can't fit some
> lenses onto them. The Tamron Pro is designed differently so that neither of
> these issues appears to be a factor. That may apply to the Kenko Pro too,
> but I have no information on that.
>
> Cheers
>



And hence is why Nikon do make matched converters for specific lenses.
ie a 1.4x for a 300 2.8 - won't fit much else.



>
> "Ken Chandler" <news@kenchandler(dot)com> wrote in message
> news:415e5e8d$0$23896$afc38c87@news.optusnet.com.a u...
>
>>Don wrote:
>>
>>>I have a 400mm L USM f5.6 lens and use it with a canon 2 times
>>>teleconvertor on my 10D and like the results. However, the autofocus
>>>doesn't function due to aperture change etc (2 stops). I hope to use
>>>the same lens with a 1.4 series 2 canon extender. Does anybody know
>>>if this will have the same autofocus issue with my 10D.
>>
>>Hi Don,
>>
>>As far a I know the 10D requires f/5.6 or wider apertures in order for the
>>centre AF point to be enabled as the more accurate cross-type sensor.
>>
>>The 400mm f/5.6 L USM + the 1.4xTC gives you f/8 which I think would
>
> revert
>
>>the centre AF point back to the non-cross type.
>>
>>If you are in Sydney, I have a 1.4x Canon TC, perhaps we could meet up for
>>you to give it a test drive sometime.
>>
>>Regards,
>>
>>Ken
>>
>>
>
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.736 / Virus Database: 490 - Release Date: 9/08/2004
>
>

[Ken Chandler]

Rob wrote:
> macropod wrote:

>> One thing to watch out for with the Canon and Sigma TCs is that
>> their front elements sit well forward and could strike the rear
>> element on some lenses (especially zooms at the wide end of their
>> range). Also, the housing for the front element on both of these is
>> so wide that you simply can't fit some lenses onto them.

> And hence is why Nikon do make matched converters for specific lenses.
> ie a 1.4x for a 300 2.8 - won't fit much else.

Both my Canon 2x and Canon 1.4x have a protruding front element surrounded
by a soft rubber which both prevents them being inserted into the wrong lens
and helps protect the rear element if you tried.

The Canon 1.4x and 2x TCs I have only fit my 70-200mm f/2.8 L IS out of my
lens collection, The are designed primarily for fixed focal length lens
longer than 135mm and well as the "L" zooms: EF 70-200 f/2.8L+IS, 70-200
f/4.0L, and 100-400 f/4.5-5.6L IS.

The old Tamron 2x TC I had fit on all my lens from the 16-35mm f/2.8 L to
the fantastic 50mm f/1.8 happy meal lens.

KC

[Ryadia]

Don wrote:
> Folks
>
> I have a 400mm L USM f5.6 lens and use it with a canon 2 times
> teleconvertor on my 10D and like the results. However, the autofocus
> doesn't function due to aperture change etc (2 stops). I hope to use the
> same lens with a 1.4 series 2 canon extender. Does anybody know if this
> will have the same autofocus issue with my 10D.
>
> Secondly, any experience with Kenko pro series compared to the Canon?
>
>
>
Your mileage with multipliers will vary from exceptional to "where has
all the detail gone?" Quite apart from Canon's EOS specs which won't let
the auto focus work with apertures smaller than f8, there are other
considerations to make when using a multiplier. They are at their best
with prime lenses on well lit scenes and at their worst with zooms under
low light. Intended for wide aperture lenses.

The Kenco Pro extenders are very good. I would say up there with Canon
for quality. Quite good enough for medium,(100 to 300 range) prime lens
use but your lens is getting out of "medium" and into long. The results
you can expect over a wide range are at best only a "devise of last
resort" quality. Probably, due to the lost light, you'll need high ISO
which on a DSLR are highly suspect at catching detail.

Given that the results are going to be something less than ideal anyway,
you really need to go for the best you can get and as good as they are,
Kenco are just a little less contrasty than Canon. Bite the bullet and
go for a Canon. I just sold mine (absolutely mint condition) on Ebay for
$450 to give you an idea of their value. From memory, Kenco's are less
than that new.

Ryadia

[Don]

Thanks for all the responses.

Ryadia, was that on Ozzie Ebay?

regards

Don
"Ryadia" <dont_spam_ryadia@hotmail.com> wrote in message
news:2s9krvF1hqp1tU1@uni-berlin.de...
> Don wrote:
>> Folks
>>
>> I have a 400mm L USM f5.6 lens and use it with a canon 2 times
>> teleconvertor on my 10D and like the results. However, the autofocus
>> doesn't function due to aperture change etc (2 stops). I hope to use the
>> same lens with a 1.4 series 2 canon extender. Does anybody know if this
>> will have the same autofocus issue with my 10D.
>>
>> Secondly, any experience with Kenko pro series compared to the Canon?
>>
>>
>>
> Your mileage with multipliers will vary from exceptional to "where has all
> the detail gone?" Quite apart from Canon's EOS specs which won't let the
> auto focus work with apertures smaller than f8, there are other
> considerations to make when using a multiplier. They are at their best
> with prime lenses on well lit scenes and at their worst with zooms under
> low light. Intended for wide aperture lenses.
>
> The Kenco Pro extenders are very good. I would say up there with Canon for
> quality. Quite good enough for medium,(100 to 300 range) prime lens use
> but your lens is getting out of "medium" and into long. The results you
> can expect over a wide range are at best only a "devise of last resort"
> quality. Probably, due to the lost light, you'll need high ISO which on a
> DSLR are highly suspect at catching detail.
>
> Given that the results are going to be something less than ideal anyway,
> you really need to go for the best you can get and as good as they are,
> Kenco are just a little less contrasty than Canon. Bite the bullet and go
> for a Canon. I just sold mine (absolutely mint condition) on Ebay for $450
> to give you an idea of their value. From memory, Kenco's are less than
> that new.
>
> Ryadia

[Ryadia]

Don wrote:

> Thanks for all the responses.
>
> Ryadia, was that on Ozzie Ebay?
>
> regards
>
> Don

yes it was... Item number: 3839613248

Ryadia