Author Topic: 1.4 / 2 x converters  (Read 4111 times)

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Offline Rob aka [minolta mad]

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1.4 / 2 x converters
« on: February 11, 2007, 06:30:59 PM »
Two fold question,
#1 whats the better converter to get ?
sigma ex 1.4 / 2x
kenko 1.4 / 2x pro 300 dg

#2 whats the maximum appeture needed for each converter to work.
my understanding is that the 2 x needs to be 5.6 or greater and will loose two stops, so does f4 becomes f5.6,
and the 1.4 x looses 1 stop so f4 becomes f5

Offline Fud

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Re: 1.4 / 2 x converters
« Reply #1 on: February 11, 2007, 07:23:07 PM »
I must admit I went with The Kenko.  There is a good article on the dyxum site.

The convertor will work with any lens it is just whether autofocus works.  The 2x with a f2.8 turns it in to a f5.6 and autofocus needs at least 5.6 to work.
« Last Edit: February 11, 2007, 07:26:40 PM by Fud »
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Offline fother

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Re: 1.4 / 2 x converters
« Reply #2 on: February 11, 2007, 09:07:58 PM »


Depends on which lens you want to attach it to

For maximum apeture, bear in mind that you'll only risk losing autofocus, you can still manually focus

Offline Rob aka [minolta mad]

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Re: 1.4 / 2 x converters
« Reply #3 on: February 11, 2007, 09:26:36 PM »
Cheers fother,

Offline doctorwho

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Re: 1.4 / 2 x converters
« Reply #4 on: February 11, 2007, 11:01:51 PM »


Depends on which lens you want to attach it to

For maximum apeture, bear in mind that you'll only risk losing autofocus, you can still manually focus


Though with many lenses, the maximum aperture could be close to unusable...

Offline fother

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Re: 1.4 / 2 x converters
« Reply #5 on: February 11, 2007, 11:13:21 PM »


True. I guess the other proviso is, I wouldn't use a TC on a mediocre lens - would want to restrict them to good quality glass, so image degradation is less likely to become a problem. If you do that, the apeture issue tends to be covered anyway. 

I've got a 2X TC in the Kenko Pro 300 range, it's been really good. So far I've used it with 200/2.8, 100/2.8 Macro, 300/4 and 80-200 2.8, and it's been great with all of them. I chose it because it works with those 4 lenses.

I don't recall if it's compatible with the kit lenses, but frankly I think it'd be a bit of a waste of time anyway

Offline fother

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Re: 1.4 / 2 x converters
« Reply #6 on: February 11, 2007, 11:14:26 PM »

Oh, PS: IIRC, the minolta / sony AF requires a 7.2 apeture to auto-focus, beyond that you're in manual city.

The 500 / 8 Reflex is the exception that makes the rule :)

Offline doctorwho

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Re: 1.4 / 2 x converters
« Reply #7 on: February 11, 2007, 11:33:31 PM »
In terms of spending power, I'd struggle to get any length 2.8 with the exception of a macro, and although 180mm 5.6 macro would be nice, a 1000mm f11 wouldn't...

Offline Fud

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Re: 1.4 / 2 x converters
« Reply #8 on: February 12, 2007, 09:19:30 AM »
In terms of spending power, I'd struggle to get any length 2.8 with the exception of a macro, and although 180mm 5.6 macro would be nice, a 1000mm f11 wouldn't...

I disagree about the 1000mm F11 - that is what I had the other night when I took the moon photos posted elsewhere attaching the 2x to the Tamron 200-500!
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Offline doctorwho

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Re: 1.4 / 2 x converters
« Reply #9 on: February 12, 2007, 10:25:53 PM »
Handheld though? If I were a rich man, (and pumped up on steroids) then a 500mm f4.5 with 1.4 tcon would be perfect for wildlife. As it stands, it's 300mm and hope fieldcraft suffices :)

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Re: 1.4 / 2 x converters
« Reply #10 on: February 12, 2007, 10:33:34 PM »


I'd be happy to try :)

Offline doctorwho

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Re: 1.4 / 2 x converters
« Reply #11 on: February 12, 2007, 11:06:48 PM »
Best eat your spinach then :)