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Minolta 100mm macro 2.8

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Bob T View Drop Down
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Post Options Post Options   Quote Bob T Quote  Post ReplyReply Direct Link To This Post Topic: Minolta 100mm macro 2.8
    Posted: 14 June 2019 at 22:18
I'm using a Minolta 100mm 2.8 macro on a a99. I find the focus hunting unbearable to the point that I seldom use autofocus on the lens. Obviously this means it can only be used with a tripod and still life. I know from reading reviews that focus hunting can be a problem with macro lenses. Are any of the newer macro lenses, such as the Tamron 90mm any better at autofocussing? Or do I learn to live with what I have?
 



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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2019 at 00:04
My old 272E Tamron 90 is slow to focus but once it gets there it locks on fairly quickly and hunting is not an issue. Have you tried using the a99's AF Range control? It's an in-body focus limiter that works really well. Press the AF Range button on the back panel and then you can limit how close and how far it will AF using the control dials or the joystick.
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Post Options Post Options   Quote waleskeg Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2019 at 02:37
I've owned the Minolta 100mm macro as well as 2 different copies of the Tamron 90mm macro and hunting has been a minor equal offender between the 2 of them, no better, no worse from one to the other and as @stiuskr said slow focusing but once there, not an issue.
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2019 at 08:11
I found the 272E pretty reliable at focussing on the A58 and A900 (like the non-RS macro 50f2.8), but to be honest I rarely use AF in near-macro, preferring focus peaking to show me how much of the image is in focus, unless the DOF is large enough for that not to be an issue.
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Bob T View Drop Down
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Post Options Post Options   Quote Bob T Quote  Post ReplyReply Direct Link To This Post Posted: 20 June 2019 at 20:38
Thanks for the replies, folks. I tried the AF Range limiter on the camera. It worked in that it reduced the range of movement on the lens, but didn't make it any easier to lock focus
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Snegren View Drop Down
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Post Options Post Options   Quote Snegren Quote  Post ReplyReply Direct Link To This Post Posted: 20 June 2019 at 21:51
Modern SSM lenses focus much better than screw drive lenses. If you are looking for better AF, this is where you should be heading.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 21 June 2019 at 05:48
Originally posted by Snegren Snegren wrote:

Modern SSM lenses focus much better than screw drive lenses. If you are looking for better AF, this is where you should be heading.
Well, SSM lenses are better because they are (much) better at micro adjustments. This advantage might not be the solution for the problem at hand. This advice is too general. In fact, it sounds to me that there is something wrong with Bob's lens. But without more information (pictures of situations were it hunted), it is impossible to know.
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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 21 June 2019 at 13:56
Yeah, intended usage and sample shots with EXIF data to look at camera settings would be very helpful. He could be wanting to use it in situations that it wasn't designed for, i.e. tracking moving subjects such as kids at play, sports or animals.

Edited by stiuskr - 21 June 2019 at 13:59
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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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 21 June 2019 at 17:14
I wonder if there is a problem with the lens too.

My best focusing lens for macro is the Tamron SP 60 F2 Di II. I am not sure its exact motor type--Tamron doesn't list it.
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awa54 View Drop Down
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Post Options Post Options   Quote awa54 Quote  Post ReplyReply Direct Link To This Post Posted: 09 August 2019 at 17:01
Interesting... on my a900 the 100/2.8 RS is fast and positive for distant subjects (limiter on or off) and it does pretty well at short distance as well. I use center area and single AF only, though, so the camera can't distract its self by picking alternate focus points.

Of course being a macro lens with a long focus throw means it'll never be as fast as a normal 100mm.
a900, a700 and plenty of glass ;)
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Post Options Post Options   Quote Roger Rex Quote  Post ReplyReply Direct Link To This Post Posted: 09 August 2019 at 18:35
Originally posted by awa54 awa54 wrote:

Interesting... on my a900 the 100/2.8 RS is fast and positive for distant subjects (limiter on or off) and it does pretty well at short distance as well. I use center area and single AF only, though, so the camera can't distract its self by picking alternate focus points.

Of course being a macro lens with a long focus throw means it'll never be as fast as a normal 100mm.


Precisely my experience with this camera/lens combination. That said, I am always on a tripod for my macro work. The only problem has been with very soft, very low contrast flower petals but that is to be expected.
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2019 at 03:07
The last time I tested, I'm pretty sure my original 100 macro (with the infinity focus limiter engaged) focused faster than my 100/2, and as accurately.
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awa54 View Drop Down
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Post Options Post Options   Quote awa54 Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2019 at 04:43
Originally posted by sybersitizen sybersitizen wrote:

The last time I tested, I'm pretty sure my original 100 macro (with the infinity focus limiter engaged) focused faster than my 100/2, and as accurately.



I don't own the 100 f2, but my 135 f2.8 is faster and less prone to hunting than the 100 macro, this isn't to say that the 100 f2.8 macro has lousy focus characteristics, just that a rear focus tele that has a longer MFD is faster.

obviously YMMV :)
a900, a700 and plenty of glass ;)
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sybersitizen View Drop Down
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2019 at 05:30
Originally posted by awa54 awa54 wrote:

... a rear focus tele that has a longer MFD is faster.

Yes, it generally is. My comment was not about that subject, but about the often repeated idea that macro lenses are doomed to be slower focusing than non-macro lenses. My experience is that they are not if things like drive type and focus distance range are kept on an even playing field.
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