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Need input on "secret handshake" 28-135mm

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arpphoto View Drop Down
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Post Options Post Options   Quote arpphoto Quote  Post ReplyReply Direct Link To This Post Topic: Need input on "secret handshake" 28-135mm
    Posted: 03 March 2024 at 16:53
Hi. I bought a copy of the 28-135mm lens and would like some input from others who use it or have used it.

#1 - My copy is sharp wide open... however, step down to 5.6, 8, 11, and it progressively becomes softer. I have tested it on all of my A mount cameras and it has the exact same performance. It is not focus shifting: I have performed AF Micro Adjustment both wide open and stopped down and it achieves its sharpest results at the same values.

This is the opposite of all other lenses I own. Typically: soft wide open and sharpens up as stepped down and micro adjustment is performed one stop stepped down due to focus shift (mostly on f1.4, f1.8 and f2.0 lenses).

#2 - On all of my A mount cameras the lens performs sharpest at a micro adjustment of 0 ~ -4. "0" on cameras I have performed a AF sensor calibration, most others fall in the -2 ~ -4 range.

I have never had a lens so consistent across multiple camera bodies. I have bodies that require +12 micro adjustment and the same lens on another body would be -6.

Is this normal for this lens?

Thanks

Adam
|a900|a850|CZ24~70|Min70~200SSM|CZ24|Son35|CZ50|CZ85|CZ135|Min17~35|Min20|Min28|Min35|Min50|Min85|Min100|Min200|Min300|Min300SSM|Son500|Min600|Sig800|Sig28|Sig20~40|Sig14|Sig50|Sig85|
 



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Sönke Henning View Drop Down
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Post Options Post Options   Quote Sönke Henning Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2024 at 08:51
I've used one 28-135 since about 20 years. It is a very (!) sharp lens in its medium focal range (about 35-100) if stopped down. As stevemark of artaphot showed, there is very little sample variation to be expected.
So I guess there's something wrong with your copy.

H.
http://www.caucasus-pictures.blogspot.com
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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2024 at 13:06
Never heard of a lens getting worse when you stop it down .
I don't have any problems with mine .
As above , it's probably not as sharp at the extremes of it's focal length, same as most lenses .

One common problem I found was that three screws inside it can come loose or fall out .
So when you focus , especially at the long end , the front of the barrel drops , effectively giving you a tilt lens .
If it's caught in time you can tighten the screws up again after removing the rubber grip , but if they've come out altogether a proper repair is needed.
This might be what your seeing .

I bought mine about seventeen or eighteen years ago .
The first one I went to buy suffered from this , but I already knew what to look for , so don't buy it .
I'd bought it off eBay but had gone to collect it as the shop was local in Manchester, and to pay on collection.
It's a good job I did as they tried to con me !
Even contacting me threw eBay demanding payment after they'd already relisted it as faulty !
Cheeky f****** !
It's a shop I've always tried avoid dealing with as the two that were running it always seemed shifty , especially with their pricing .
I've been in there looking at stuff when two separate people asked about the same item .
The second person that came in wearing a flash suit was given a price £200 more than the previous person .
So never go in their looking like your flush .
I prefer to deal with London Camera Exchange ( LCE) as they price their used gear up .
( You can still haggle or part exchange gear though)

The second lens I bought was spot on though .

Edited by neilt3 - 11 May 2024 at 13:15
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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japp View Drop Down
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Post Options Post Options   Quote japp Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2024 at 15:59
heei, i don't know if is the case with your lens but mine had problem with focus. specifically i had just micro adjusted the lens, and after using it for around two Hours the focus was off again. eventually after doing this 3 or 4 times, i saw the front lens was touching the lens behind it and thereby screwing up the focus. i don't know if this is the case with your 28-135 but if it is, it is an pretty easy fix. just unscrew the little screw below the filter thread and then unscrew the front lens element. after this you can screw in the loose lens that is now up front. after doing this i could use this lens perfectly without any problem reoccurring.

hope this helps!
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dxqcanada View Drop Down
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Post Options Post Options   Quote dxqcanada Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2024 at 22:23
I looked back through my LR library and checked the images that I took when I had that lens on my A55 ... no softness at smaller apertures.
Focus was pretty spot on with that camera even though it has no micro adjustment feature.
Sony A77mII, A57, Nex-6 | Minolta Maxxum 9000, Autocord
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