Using OM lenses - aperture control

The adapters have an internal tab (often a screw) so that when the lens is mounted the lever that stops down the aperture is held in place. It essentially works the same as having the dof preview button permanently pressed down.

 

Welcome and Hello from Scotland  

I use OM lenses myself, and they work well.

All the best,

Colin

 

Depends on the prevailing light conditions. On a bright day where I live the screen view is fine even at f11. In darker conditions you may need to focus wide open and then choose you aperture.

 

You may have to use 'stop-down' focussing - ie focus wide open and then stop down to shoot. In A mode the camera will take care of exposure.

 

You must manually stop down the lens, and Liveview will give you the actual depth of field for the image.

Remember that DOF marks on a lens are very subjective, and make a number of assumptions about scene content and viewing distances. As the lens is stopped down at the time of exposure, and you have "Liveview" for the image- What you See is What you Get.

 

DOF is similar to FF, but off by two stops, and remember Field of View (FOV) is also narrower as if the FL were doubled. So, a 50mm 1.4 lens at 1.4 on an m43 camera will give you similar FOV and DOF as a 100mm 2.8 lens on FF (though exposure is still at f/1.4). Makes the math simple! You sound experienced, so once you try it out, you'll understand pretty quickly.

 

Yes , as long as you always control for the same framing. Which is why Voigtlander made the 25mm 0.95, so it acts like a 50/1.8 in terms of DOF.

I don't use hyperfocal much, so I couldn't say, but I think it's a linear relationship, so it should hold true, but perhaps others can comment.