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Minolta 300mm F2.8 APO Old, advice needed please

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Badr View Drop Down
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Posts: 16 		Post Options Post Options   Quote Badr Quote  Post ReplyReply Direct Link To This Post Posted: 24 December 2020 at 13:45
Merry Christmas and a happy festive season t


Update
Well, after I explained how I wanted the chip to be installed and took an 8 pin reference lens I got it back last week (I hope the photo link works). The lens is identified by the camera and aperture is controlled nicely however, it is continuously hunting on all 3 of my cameras. Not sure if it is a faulty chip or wrong fit. the pins seem well aligned. A bit disappointed and not sure what to do next.
options are
1- To try and fit a 50mm lens chip.
2-Order another chip (already emailed James with the issue)
3- Use it manually.

Now I am more tempted to go with the first option.

IMG_20201218_230425 by Badrelmaarif Elsammani, on Flickr


Edited by Badr - 30 December 2020 at 21:58
 



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neilt3 View Drop Down
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Posts: 2611 		Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 01:35
How did you get on ?

Funnily enough as I've posted on this thread I get notifications of posts made ( along with it's content ) .

On the 24th December you made a post saying you were having problems with the lens hunting for focus though the aperture was working fine .
Strange thing is that this post has been removed from this thread .

Did you get it sorted out ?
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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stiuskr View Drop Down
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Posts: 11403 		Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 11:48
Originally posted by neilt3 neilt3 wrote:

How did you get on ?

Funnily enough as I've posted on this thread I get notifications of posts made ( along with it's content ) .

On the 24th December you made a post saying you were having problems with the lens hunting for focus though the aperture was working fine .
Strange thing is that this post has been removed from this thread .

Did you get it sorted out ?


For some reason the forum's software hid the Dec. 24 post Pending Approval which has just been approved. Sorry about that.
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 CZ24-70G2 KM28-75D So70-200G1 So70-300G So70-400G1| SonyF60 AD200R2
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neilt3 View Drop Down
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Posts: 2611 		Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 12:52
Originally posted by stiuskr stiuskr wrote:

Originally posted by neilt3 neilt3 wrote:

How did you get on ?

Funnily enough as I've posted on this thread I get notifications of posts made ( along with it's content ) .

On the 24th December you made a post saying you were having problems with the lens hunting for focus though the aperture was working fine .
Strange thing is that this post has been removed from this thread .

Did you get it sorted out ?


For some reason the forum's software hid the Dec. 24 post Pending Approval which has just been approved. Sorry about that.


Too much Christmas cheer perhaps ?
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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mambo View Drop Down
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Posts: 1731 		Post Options Post Options   Quote mambo Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 14:43
Originally posted by Badr Badr wrote:

Merry Christmas and a happy festive season t


Update
Well, after I explained how I wanted the chip to be installed and took an 8 pin reference lens I got it back last week (I hope the photo link works). The lens is identified by the camera and aperture is controlled nicely however, it is continuously hunting on all 3 of my cameras. Not sure if it is a faulty chip or wrong fit. the pins seem well aligned. A bit disappointed and not sure what to do next.
options are
1- To try and fit a 50mm lens chip.
2-Order another chip (already emailed James with the issue)
3- Use it manually.

Now I am more tempted to go with the first option.




I had a similar issue with the first chip that James sent to me for my Minolta 600G. It was as it the lens was trying to focus too quickly and ended up missing focus altogether. James the created a second chip at no cost that was perfect. His argument was that he did not have a telephoto lens to try out the chip on. If he is sending a second chip, I suggest that you offer to pay a faster courier service as the standard shipping took six weeks in my case.
Charles M

A99, Minolta:|200f2.8HS|∑35f1.4Art|A6400|A7Riii| Viltrox 85f1.8|SEL200600G|Zeiss32f1.8|Sigma16f1.4|Samyang 45 f1.8; 35 f2.8; 24 f2.8|
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neilt3 View Drop Down
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Posts: 2611 		Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 15:07
The chip I got off him was a 600mm f/4 which I fitted into my 2x Minolta teleconverter , for when it's fitted to my Minolta 300mm f/4 .

It tricks the camera to AF where it would usually be disabled as when fitted the lens become f/8 .

Providing there's adequate light and a good target , AF works well .
Mounted to a Minolta 200mm f/2.8 , it works as intended .
Granted EXIF and image stabilization is out .
But it does confirm the chip works as intended .

If the aperture works correctly , it does suggest it was fixed in the correct position , so replacing with a replacement chip would be best , rather than using a 50mm chip .

Hopefully you'll get it sorted sooner rather than later .

If I need another chip , I wouldn't hesitate to get another off James .
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
 



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Badr View Drop Down
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Joined: 02 February 2018
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Posts: 16 		Post Options Post Options   Quote Badr Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2021 at 23:30
Hey all

Hope you've enjoyed a lovely Christmas and New year.

Sorry for the late reply and thanks for the replies.


I was checking for sometime waiting for my post to be approved.



Yes it looks like a chip problem as the pins seem to be aligning well when compared to other lens.

Got me frustrated I think because of high starting expectations. On the bright side I had the chance to know my local repair man. Not only he brought to life some of my gear but he is a nice person to know too.


James hasn't replied yet to my eBay massage and I don't want to order another before him knowing first.


I am sure I will get to the bottom of it oneday
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neilt3 View Drop Down
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Joined: 13 September 2010
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Posts: 2611 		Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 10 January 2021 at 01:09
The fact the aperture works correctly and the lens identifies itself means the contacts are correctly located .
Hopefully you'll hear back from James soon and get a replacement chip & contacts .
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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Miranda F View Drop Down
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Location: Bristol
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Posts: 3580 		Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 10 January 2021 at 20:37
It's quite difficult to get a mechanical/electrical control loop to operate properly if you don't have one to play with and you have no idea how fast it moves, how much mechanical inertia there is (inertia versus friction ratio) and how much mechanical dead play there is ...
A few of the Minolta lenses got speeded up in later versions which affects that too.
I'm sure James will come back with a better fit.
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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