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You can look for any 1/2" B4 Mount lens on the market. I'd go for a Canon PH Lens (especially a PH15x7B or a PH14ax6.6B). Lenses ending with KRS have no extender, lenses ending with IRS are with extender, lenses with an "a" before the x are internal focusing lenses. They sell for about 80$ to 400$ depending on condition.
There are 2 Canon fittings, EF for all EOS cameras and EF-S for 'crop' cameras. The Canon extender does not fit crop cameras. Whichever make you look at, make sure it will fit the type of mount you have.
If you have not yet bought your lens of choice, Sigma are good and do their own extender compatible with their own lenses but not Canon's. This may be a good option for you
sounds like lense gears are going bad, when you turn camera on the lense extends, if it does not extend fully probably will not auto focus, call sony for address for estimate of repairs.
lens has been damaged and it's most likely not worth repairing. lens can look fine but internal damage will require more money than it's worth. recommend replace
Apparently, the extender is designed to work only with specific lenses. B&H Camera has a chart available here showing which lenses it is compatible with. Note that even if the extender will fit on a specific lens, autofocus capability is not always possible. All the lenses listed are professional series ("L") lenses, and I don't see any 75-300 or 18-200 listed.
I believe the FZ7 determines that the lense cap is still on when it can't extend the zoom lense because the lense cap is in the way. I would check to see if your zoom lense housing is somehow stuck (could be sand or dirt in it) which is creating enough resistance to make the camera think the lense cap is impeding the zoom lense from extending.
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