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Old July 18th, 2012, 05:59 PM   #1
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Canon C300 + 40mm pancake Mfr# 6310B002

Auto focus doesn't work... yet?

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Old July 19th, 2012, 07:26 AM   #2
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Re: Canon C300 + 40mm pancake Mfr# 6310B002

Hi Philip,

Great photo!

Looks like a fancy lens cap!

Bit fiddly to focus manually on a C300 so autofocus would be a great addition to the firmware wish list.

Can't be that difficult?

Incidentally I bought the EF-S 18-135mm f/3.5-5.6 IS STM to add to my kit. It's very useful for those situations where you just need a bit more throw on your lens such as filming a meeting or group of people.

Very smooth focus, good IS and pleasing bokeh. Not quite as sharp as the 17-55mm F/2.8.

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Old July 19th, 2012, 06:38 PM   #3
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Re: Canon C300 + 40mm pancake Mfr# 6310B002

I have to admit, the pancake on the C300 made me giggle. :)
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Old July 20th, 2012, 03:10 AM   #4
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Re: Canon C300 + 40mm pancake Mfr# 6310B002

Quote:
Originally Posted by Mark Dobson View Post
Bit fiddly to focus manually on a C300 so autofocus would be a great addition to the firmware wish list.

Can't be that difficult?
We won't ever see proper auto-focus on the C300 as it doesn't have the necessary hardware like the XF105/305 or even the T4i/650D for using the new STM lenses.

Quote:
Originally Posted by Mark Dobson View Post
Incidentally I bought the EF-S 18-135mm f/3.5-5.6 IS STM to add to my kit. It's very useful for those situations where you just need a bit more throw on your lens such as filming a meeting or group of people.

Very smooth focus, good IS and pleasing bokeh. Not quite as sharp as the 17-55mm F/2.8.
The Canon 17-55mm F/2.8 is what I generally have on my C300 just about the only other lens I use is the 70-200mm F/2.8L IS II. I have however contemplated buying the 18-200mm f/3.5-5.6 IS for that extra reach for run'n'gun situations. For even greater reach there is the Sigma 18-250mm & the Tamron 18-270mm but I have always been so disappointed with off-brand lenses that I will probably stick to the Canon.
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Old July 20th, 2012, 08:11 AM   #5
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Re: Canon C300 + 40mm pancake Mfr# 6310B002

Hi Nigel,

I agree with what you say " We won't ever see proper auto-focus on the C300 as it doesn't have the necessary hardware like the XF105/305 or even the T4i/650D for using the new STM lenses"

The hardware you refer to is presumably the sensor?

The actual mechanical focus adjustment is achieved within the lens either with USM ( UltraSonic Motor ) or the new STM.(Stepping Motor Technology)

The T4i/650D has the hybrid CMOS sensor that has a phase detect capabilities built on the image sensor itself to enable it to constantly auto focus.

Now I'm not clever enough to really understand how that all works and all I would ever want would be to to electronically spot check the focus. Just like I do with my Canon 7D.

So could a firmware update enable the C300 to utilise the contrast detection autofocus method?

This is achieved by measuring contrast within a sensor field, through the lens. This method of autofocus is implemented in software.

Last edited by Mark Dobson; July 20th, 2012 at 08:12 AM. Reason: typo
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Old July 20th, 2012, 09:00 AM   #6
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Re: Canon C300 + 40mm pancake Mfr# 6310B002

I suspect that the C300 doesn't even have the hardware necessary to talk control the focus motor within the lens.
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Old July 21st, 2012, 02:28 AM   #7
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Re: Canon C300 + 40mm pancake Mfr# 6310B002

The C300 is able to focus a lens through the wireless controller or a Lanc controller so that end of the equation is there.

All it needs now is the firmware to be tweaked to enable the sensor to be used to measure focus . . . or not.

This is a question for someone like Alan Roberts.
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Old July 21st, 2012, 08:27 AM   #8
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Re: Canon C300 + 40mm pancake Mfr# 6310B002

Quote:
Originally Posted by Nigel Barker View Post
I suspect that the C300 doesn't even have the hardware necessary to talk control the focus motor within the lens.
Then how is it the WFT can pull focus?
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Old July 21st, 2012, 01:47 PM   #9
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Re: Canon C300 + 40mm pancake Mfr# 6310B002

Quote:
Originally Posted by Nigel Barker View Post
I suspect that the C300 doesn't even have the hardware necessary to talk control the focus motor within the lens.
Quote:
Originally Posted by David A. Fisher View Post
Then how is it the WFT can pull focus?
Of course you are absolutely correct I had forgotten that I had actually read a review of the WFT-E6 used on the C300 describing the ability to remote focus.
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Old July 21st, 2012, 10:36 PM   #10
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Re: Canon C300 + 40mm pancake Mfr# 6310B002

Speaking of 40mm lenses, my favourite lens on the C300:
Voigtlander Ultron 40mm f/2.0 SL-II Manual Focus Lens BA229DN

A bit pricier but a stop faster than the Canon, close focussing, wonderful build quality, tactile focus ring.
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