Author Topic: 1.4 TC and 70-200G SSM  (Read 3681 times)

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Offline Rob aka [minolta mad]

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1.4 TC and 70-200G SSM
« on: March 09, 2009, 08:16:48 PM »
Thanks to Steve, i have the loan of a minolta 1.4 APO ll TC.
Was just trying it out and tried the 300/4 and Sony 70-200G and to my surprise found that the SSM no longer works and its MF only.

I take it that this is normal ??? and it has something to do with the 8 pin contacts rather than the 5 the TC has ???


Rob

Offline Stef.

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Re: 1.4 TC and 70-200G SSM
« Reply #1 on: March 09, 2009, 08:46:41 PM »
Not sure about the Minolta one but with the Sony 1.4tc everything functions the same was as without... but than that's not what you wanted to know ???
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Offline Fixxxer

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Re: 1.4 TC and 70-200G SSM
« Reply #2 on: March 09, 2009, 08:53:56 PM »
If my memory serves me...when I tried out the Minolta 1.4TC autofocus stopped. Admittedly that was on a Dynax 7000i several years ago, but that shouldn't change it. I could be wrong, but I'm fairly certain it was the Minolta 1.4 APO II.
« Last Edit: March 09, 2009, 08:55:50 PM by Fixxxer »

Offline Rob aka [minolta mad]

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Re: 1.4 TC and 70-200G SSM
« Reply #3 on: March 09, 2009, 09:05:34 PM »
Its just that i was always led to believe that the extra 3 pins on the newer lenses/bodies was all to do with the ADI flash system ???
Obviously not !


Rob

Offline Fixxxer

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Re: 1.4 TC and 70-200G SSM
« Reply #4 on: March 09, 2009, 09:37:36 PM »
Well I've just checked my "Tele Plus" M-AFi 2x TC. That only has five pins and definetly doesn't allow autofocus (Edit - the lens hunts in autofocus mode and doesn't find focus).

Edit 2: Sorry Rob, I guess that doesn't actually help much.
« Last Edit: March 09, 2009, 09:44:32 PM by Fixxxer »

Offline Bill

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Re: 1.4 TC and 70-200G SSM
« Reply #5 on: March 15, 2009, 05:09:24 AM »
Crap!  Here I thought this was a thread showing a bunch of samples of the pair!

Anyways...If I recall correctly, the 8 pin type contact came out with the Maxxum 7 and later versions of the Maxxum 9.  It was dual purpose.  First, I believe that it was to allow the 7 and 9 (and later bodies) to communicate with the new SSM lenses.  This would definitely affect focus.  Second, it allowed feedback from SSM lenses as to focus distance.  This is how ADI works. 

Back in the old days, flash photography involved taking measurements from film plane to subject, then doing the math as far as light falloff at that distance with the light output of the flash being used.  Minolta then came forward with TTL OTF flash.  This was cool.  The flash would fire and the light would reflect off the subject, entering the lens and exposing the film.  While this was occuring, a small portion of the light would reflect off of the film onto some sort of sensor.  When the sensor received the correct amount of light, the flash was extinguished.  While this works wonderfully, Minolta decided that their onboard computers were now quick enough to quickly read the focus distance of the lens, set the correct flash exposure and fire the flash without a serious lag time.  They began to create new lenses with this "ADI" capability.

The added 3 contacts, I believe (and I could be completely wrong :-) ) work with ADI and SSM both.

Bill

EDIT:  Just as a post thought...ADI only works when the flash is fired directly at the subject, such as an onboard popup flash or an accessory flash pointed straight ahead.  If an accessory flash is used wirelessly, in bounce mode, or in swivel mode, ADI does not work.  The Flash tells the camera that it is wireless or that it is not pointed straight ahead.  At this point, the camera body changes the flash type to TTL pre-flash.  What happens then is a very short micro-burst is sent prior to exposure.  The camera body measures the light that is reflected off of the subject during this pre-flash.  It then sets correct flash output and the shutter is opened, the flash is fired for a correct exposure and the shutter is closed.  This all happens in milliseconds.

I hope this helps.  By the way, most of this can be found by looking up Gary Friedman Archives on the web, then searching his free articles on the Minolta Flash System.

Bill
« Last Edit: March 15, 2009, 05:18:03 AM by Bill »
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Offline tpe

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Re: 1.4 TC and 70-200G SSM
« Reply #6 on: March 15, 2009, 10:19:30 AM »
I must admit i thought that the 8 pin would work with ssm too.

This is what they say on the black forum

1) Minolta APO Original -- has 5 contact pin (for non-HS APO lenses)
2) Minolta APO II -- has 5 contact pin (for HS APO lenses)
3) Minolta APO (D) -- has 8 contact pin, will AF with SSM lenses and (D) lenses compatible.

So if it is the 8 pin version it should have the D nomination and work with both of your lenses.

Is there any dirt on the contacts? I would be very interested to hear that this definatly does or does not work as one day i might have the same lineup. Right now my tc does not work with my 80-200 but does on my 300/4 but that is a question of dimension.

tim

Offline REX (aka TG)

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Re: 1.4 TC and 70-200G SSM
« Reply #7 on: March 16, 2009, 05:39:14 AM »
Thats what i wanted to know in a previous threat

  http://www.dynaxdigital.com/index.php/topic,8934.0.html
« Last Edit: March 16, 2009, 05:42:59 AM by TG »
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Offline mphotoservices

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Re: 1.4 TC and 70-200G SSM
« Reply #8 on: March 16, 2009, 04:00:08 PM »
TPE I know you could use a tamron to get the af on the 80-200 to work as mentioned in other threads. And without getting into the debate on the AF and hunting and wearing out gears. I've used mine outdoors for over 10 years and have never had any issues.
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Offline Rob aka [minolta mad]

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Re: 1.4 TC and 70-200G SSM
« Reply #9 on: March 21, 2009, 09:09:21 PM »
The tc is the minolta APO II with 5 pins, sorry for not mentioning it earlier.


Rob