Irix 15mm f/2.4 with EF-RF adaptor

I recently bought a Canon RP camera with the original Canon EF-RF adaptor. Checking how my EF lenses work with the adaptor (and they do work fine), I noticed that with my Irix 15mm f/2.4 Firefly there is no focus confirmation, as it was the case when I used this lens with my previous DSLR camera (Canon 6D mark II). I am still using this lens with the camera in the AV (Aperture Value/Priority) mode and I can still change through it the aperture, which means that there is indeed communication between the camera and the lens through the adaptor, but still I don't get the focus confirmation as in my DSLR. Is this a limitation of the EF-RF adaptor or do I have to change something in the settings of the camera?

Thanks in advance for your help.

VT

vtzerpos wrote:

I recently bought a Canon RP camera with the original Canon EF-RF adaptor. Checking how my EF lenses work with the adaptor (and they do work fine), I noticed that with my Irix 15mm f/2.4 Firefly there is no focus confirmation, as it was the case when I used this lens with my previous DSLR camera (Canon 6D mark II). I am still using this lens with the camera in the AV (Aperture Value/Priority) mode and I can still change through it the aperture, which means that there is indeed communication between the camera and the lens through the adaptor, but still I don't get the focus confirmation as in my DSLR. Is this a limitation of the EF-RF adaptor or do I have to change something in the settings of the camera?

Thanks in advance for your help.

VT

I don't know about the adapter and how it may affect the indicator, but on my Samyang 14mm f2.4 XP (I didn't buy the Irix because the first 3 lenses I tried were defective - 2x Firefly and 1x Blackstone) on my 6D ii the focus indicator is sort of superfluous.

The reason being I think is that the DoF with these UWA lenses, even wide open is so big that it is fairly hard not to be in focus (good enough for daytime purposes) simply setting the focus using the distance scale (which I think from memory steps from 3m to infinity, so pretty much everything outdoors is infinity). I can rotate my focus ring quite some distance before the focus indicator will change state.

And, of course for stars (my main subject for my 14mm) the focusing has to be done MUCH more accurately than could be achieved using the focus indicator.

Colin

I sent my question to Irix and they replied, saying this: “For mirrorless cameras, you need to enable "focus peaking" in the settings. This should solve your problem.”

vtzerpos wrote:

I sent my question to Irix and they replied, saying this: “For mirrorless cameras, you need to enable "focus peaking" in the settings. This should solve your problem.”

Do you want this focusing aid for normal daytime work, or for astro/stars ?

IMO for daytime or indoor use with a UWA lens like this the focus distance scale is perfectly adequate to achieve very good (if not perfect) focus.

For astro/stars, no focus indicator or focus peaking is going to be accurate enough to achieve sharp stars. The only way to achieve decent focus is either with a physical aid like a Batinov filter or doing what most of us do, which is to use Live View and maximum magnification to find a bright star and adjust focus on it.

Colin