OM 40-150mm ED MSC focussing problem?

Started May 29, 2013 | Discussions
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Steve Jamieson Junior Member • Posts: 44
OM 40-150mm ED MSC focussing problem?

Does your copy of this lens change focus when zooming? Is that normal? Also I find the close focus distance to be longer at the short end of the zoom, probably about 1.5m compared to the 0.9m at 150mm. Steve.

JeanPierre Martel Senior Member • Posts: 2,860
Re: OM 40-150mm ED MSC focussing problem?

Steve Jamieson wrote:

Does your copy of this lens change focus when zooming?

Never. However, the settings chosen for my OM-D sets focus when the trigger button is pressed, half-pressed or when the back LCD screen is touched (to set focus or to take a picture).

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Gregm61 Forum Pro • Posts: 14,532
Re: OM 40-150mm ED MSC focussing problem?

Steve Jamieson wrote:

Does your copy of this lens change focus when zooming? Is that normal?

If you focus the lens while set to (for example) 40mm, then zoom it somewhere else, you do have to refocus.

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s_grins
s_grins Forum Pro • Posts: 10,342
Re: OM 40-150mm ED MSC focussing problem?

Are you talking about legacy OM zoom lens?

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Palin0_0
Palin0_0 Contributing Member • Posts: 614
Re: OM 40-150mm ED MSC focussing problem?

The focus change a little bit.....not much...at least in my copy....about  how much chage the focus in the closest setting  i never check .......but i will  tonight and comment back......

regards

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Steve Jamieson OP Junior Member • Posts: 44
Re: OM 40-150mm ED MSC focussing problem?

Yes, focus at 15ft set to 40mm then zoom to 150 mm and the focus goes way out. Steve.

Gregm61 Forum Pro • Posts: 14,532
Re: OM 40-150mm ED MSC focussing problem?

Steve Jamieson wrote:

Yes, focus at 15ft set to 40mm then zoom to 150 mm and the focus goes way out. Steve.

Yep, all of these zooms do that. Even the 12-60 and 50-200 SWD zooms for the Olympus DSLR's I used before do that. Zoom is the generic term, but these really are all varifocal lenses. I have not owned a "true" zoom that held focus when zoomed while set to a specific distance for a long time. Pre-AF (prior to 1985) for sure. Last one I remember using was a Vivitar Series 1 90-180mm f4.5 Flat Field in Nikon F mount, a superb lens.

I'm sure they still exist in some line, but none of these micro zooms are.

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Steve Jamieson OP Junior Member • Posts: 44
Re: OM 40-150mm ED MSC focussing problem?

Hi Greg, Thanks for the reply. Lens is working much better now. I should have added that I was making a repair to the lens, replacing a ribbon cable and the mounting ring after it had been dropped and broken. What I eventually found was that the ribbon cable was fouling the movement of the rear lens element (restricting its movement by only about 1mm) and that was causing the focussing issues. After tucking the ribbon out of the way the situation was much improved. Close focussing distance is as specified 0.9m at both ends of the zoom although there is still a slight focus change when zooming, nothing like as bad as it was though. Really happy with the repair, soldering was very tricky though and I can recommend Luton Cameras in the UK for the parts which only cost £15. Steve.

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