FAQ FAQ  Forum Search   Events   Register Register  Login Login

problem Tamron 90mm macro and LA-EA3

Author
braisim View Drop Down
Senior Member
Senior Member

Joined: 09 November 2011
Country: United Kingdom
Location: Brussels
Status: Offline
Posts: 361
Post Options Post Options   Quote braisim Quote  Post ReplyReply Direct Link To This Post Topic: problem Tamron 90mm macro and LA-EA3
    Posted: 23 November 2021 at 19:23
Hi all, I was wondering if someone might be able to give me some advice.
I'm having a problem with my Tamron lens (SP 90mmF/2.8 Di MACRO 1:1 USD (F004)) with my LA-EA3 adapter on the Sony A7III.

The autofocus no longer seems to work and what's more there is intermittent aperture information shown in the EVF. When I try and select the focus mode on the A7III, it occasionally says that the lens is not supported or is not properly fitted. I've tried cleaning the lens contacts, the lens is quite new.

The only other A-mount lens I have is a Minolta 50 1.7 so obviously no AF with the LAEA3, but at least this lens always shows the aperture in the EVF. The problem is I don't have another A-mount DSLR or SSM/SAM A-mount lens to see if I can eliminate a problem with the adapter.

I've also tried with an LAEA4 adapter. Here the Minolta 50 1.7 works fine. The Tamron won't focus ((is this to be expected?) and shows intermittent 'F--' in the aperture info in the EVF. I'm also hearing a very high-pitched squeal from either the lens or the adapter.

I'm minded to think the lens is defective at this point. Repair is quoted at 250 by the Tamron agent here in Belgium which is not very economic given the value of the lens. I can live without AF on this type of lens but not being able to change aperture is a bit annoying to say the least.

Would someone have some insight on this, or some suggestions? Thanks.
α7 III flickr instagram
 



Back to Top
addy landzaat View Drop Down
Senior Member
Senior Member

Joined: 22 April 2006
Country: Netherlands
Location: Netherlands
Status: Offline
Posts: 12167
Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2021 at 19:36
Did you try it on an A-mount body?

You already cleaned the lens contacts, I would also clean the camera and adaptor contacts just to be sure.

It sounds communication is interrupted, could be a broken cable inside. I guess the repair cost is a flat cost. It is what it is. 250,- is probably cheaper then replacing the lens.
Why not follow me on Instagram? @Addy_101
Back to Top
QuietOC View Drop Down
Senior Member
Senior Member

Joined: 28 February 2015
Country: United States
Location: Michigan
Status: Offline
Posts: 3428
Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2021 at 19:37
Tamron USD lenses should focus on any of the LA-EA adapters. It sounds like the lens is not communicating properly with the adapter.
Sony A7RIV NEX-5T HVL-F45RM LA-EA5 Metabones-IV Sigma MC-11 Yongnuo EF-E II TLT ROKR MD-NEX KR-NEX DA-NEX
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9 AF-P/Q
Back to Top
braisim View Drop Down
Senior Member
Senior Member

Joined: 09 November 2011
Country: United Kingdom
Location: Brussels
Status: Offline
Posts: 361
Post Options Post Options   Quote braisim Quote  Post ReplyReply Direct Link To This Post Posted: 24 November 2021 at 15:26
Thanks for your advice. Looks like the repair is the best option. Unfortunately Addy I don't have a A-mount DSLR at hand to test the lens.
When I bring the lens in I will ask the shop if they can first just test it to make sure (assuming that they have an A-mount body of course...)
Thanks QuietOC for the clarification on the LAEA4. The fact that the lens will focus with neither adapter certainly leads me to believe that it is a lens issue.
α7 III flickr instagram
Back to Top
Dyxum main page >  Forum Home > Equipment forums > Lens Talk > A-mount lenses

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.064 seconds.

Monitor calibration strip

Dyxum.com - Home of the alpha system photographer

In memory of Cameron Hill - brettania

Feel free to contact us if needed.