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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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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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waleskeg View Drop Down
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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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Miranda F View Drop Down
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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.
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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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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addy landzaat View Drop Down
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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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