Re: B4 2/3" to E-mount for F3
 

I bought the MTF B4 to F3 and I must say I am not very impressed. It tends to flex and leaks light regardless of how well I support the lens. I resorted to putting on a little gaff tape to seal the leaks.

Works as advertised, but barely. As always, you get what you pay for.

Re: B4 2/3" to E-mount for F3
 

maybe your adapter is defective, have you contacted MTF or your supplier? I know my first MTF adapter for the F3 had issues and I had to exchange it for another one..

Re: B4 2/3" to E-mount for F3
 

Yes, it designed to work with an F3 to EF adapter, so F3(FZ)-EF-B4.

I'm using one with an F5 up here in arctic Norway shooting the Aurora, or at least I should be, it's been rather cloudy so far.

Re: B4 2/3" to E-mount for F3
 

John sorry to hear you are not impressed with your adapter. I'm looking to buy one used, so if you have any interest in selling yours please let me know.. thanks,

Re: B4 2/3" to E-mount for F3
 

When using one of these adapters, which aspect ratio of the is preferred. ie. 4:3 or 16:9 lens?

Re: B4 2/3" to E-mount for F3
 

The aspect ratio really makes no difference.

Re Light leaks. I assume you are using the supplied support arm for the adapter? This is there to minimise the flex in the mount. Making a a bolt on cover to go across the FZ to EF part of the mount was considered. This would prevent any light leaks and firm up the mount, but make it hard to quickly switch between different cameras and mounts. Light leaks is not a common issue, the EF mount has 3 adjustable tabs that can be expanded with a small screwdriver to give a tighter fit.

Re: B4 2/3" to E-mount for F3
 

Thanks, what is the difference then between 4:3 and 16:9 mode on a B4 lens and would I care to have one over the other for use on the F3 or F5/F55 ?

Re: B4 2/3" to E-mount for F3
 

Anyone know?

Re: B4 2/3" to E-mount for F3
 

I assume you are talking about a lens with a ratio converter built in. The 4:3 option introduces a 0.82x reducer into the image path so that the image circle becomes smaller to make best use of a 4:3 crop from a 16:9 sensor. As soon as you engage the 2x extender though, the ratio conversion is removed anyway. So you can leave it on 4:3 or 16:9 it won't make any difference with the MTF adapter as you will need to have the extender engaged for that.

Re: B4 2/3" to E-mount for F3
 

Thanks for confirming that. Appreciate it.