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Message: <blockquote data-quote="Swissboy" data-source="post: 1878919" data-attributes="member: 4926">Apparently, the objective diameter has been reduced in the FZ35/38. Usually, it is rather the other way around. In this case, the FZ35/38 has a 46 mm thread and thus does not need a step-down ring. But there is not enough space around the lens barrel for the two releasing knobs on the side. The overall diameter over these knobs is 54 mm, and they get stuck when the lens is retracted. Thus, a 58 mm set-up would be of even less use in my case. If anything, I'd need extension rings of 46 mm diameter. But I still have a question about your set-up. Does the extension ring still allow you to focus to infinity? I recall from my analog cameras that the extension rings allowed closer macro pictures, but at the cost of losing the possibility to focus at the long-distance side. In fact, I wonder why you should have a retraction problem in the first place with that wider barrel.46 mm tubes are also available though a bit more expensive, e.g. here:   <a href="http://cgi.ebay.co.uk/46mm-PANASONIC-LUMIX-LX3-Filter-Adapter-Tube-Lens-Cap-B-/370097135229?cmd=ViewItem&pt=UK_Photography_DigitalCamAccess_RL&hash=item562b821e7d" target="_blank">http://cgi.ebay.co.uk/46mm-PANASONIC-LUMIX-LX3-Filter-Adapter-Tube-Lens-Cap-B-/370097135229?cmd=ViewItem&pt=UK_Photography_DigitalCamAccess_RL&hash=item562b821e7d</a>So my question about your system is more than just academic.</blockquote>