Focal reducers?

[erwiurewurwehu]

I recently started reading about focal reducers and it sounds like an interesting concept. But I can't find any information about when it can be used and when not and what the drawbacks are. In particular I wonder about:

- Does the lens have to be a full frame or can you use an APS-C lense?

- Could you make the Fuji 10-24 into a super super wide angle 2.8 lens?

 

Does anybody have a link to an article that explains the basics or can explain here? The adapters I have found a re a little too expensive to just try out.

[milandro]

focal reducers, as you call them, are meant to adapt old lenses on cameras with a sensor smaller than 24mm x 36mm so that there is no magnification used on a smaller format compared to their original one when used on a larger format

 

They gain you also a stop.

 

They don’t work with all lenses because a lens protruding too much inside will touch the optical elements which they contain.

 

You cannot use it to make a fuji lens wider than it is.

 

just google  the words focal reducer and fujifilm X, you will find plenty of information

[erwiurewurwehu]

focal reducers, as you call them, are meant to adapt old lenses on cameras with a sensor smaller than 24mm x 36mm so that there is no magnification compared to their original one when used on a large 

 

They gain you also a stop.

 

They don’t work with all lenses because a lens protruding too much inside will touch the optical elements which they contain.

 

You cannot use it to make a fuji lens wider than it is.

 

just google  the words focal reducer and fujifilm X, you will find plenty of information

Thanks for clarifying. There is a lot of information on the web but none as concise as your response :-)

[milandro]

[erwiurewurwehu]

Great diagram! It looks like this will work only with a lens that has "unused" sections of the front element like a full frame on APS-C. 

[rdelbar]

This is one blog post I wrote on the topic.

[Dis]

This is one blog post I wrote on the topic.

That's great to meet you here. These posts are great and helped me lot. Thank you very much!