Here is the Canon RF 100mm f/2.8L IS USM Macro

[chrysoberyl]

You don't really need focus fine tuning with a RF lens, you can variable focus speed so that it can focus in very fine increments. Ideal for manual macro focusing.

from TDP

View attachment 196833

All RF lenses are focus by wire? Can anyone advise whether they are fiddly like the Sigma 70mm Art?

 

[Mt Spokane Photography]

All RF lenses are focus by wire? Can anyone advise whether they are fiddly like the Sigma 70mm Art?

So far they are. The setting is in the body, not the lens.

 

[SteveC]

But we all know EF tubes are useless for RF!

Nope. EF air is compatible with RF air. But not the other way around.

 

[deleteme]

It's not quite a ring, but a few solid stops. I can imagine if this is focus bracketing, every step is a defined amount different backwards or forward from the focused point. That would let you make your focus brackets in specific amounts, and if it's electronic, you could probably define how far of focus every step is.

Fiddling with a ring seems to be a way to maximize camera movement in a process that wants to avoid that. I use silent shutter and control my camera with CamRanger precisely so I don't have to touch my camera.

 

[Sparky]

SA = Sony Alpha control? How many Sony’s you can neutralise within 100yds!

 

[Dockland]

SA = Sony Alpha control? How many Sony’s you can neutralise within 100yds!

I think it says 5A

 

[bks54]

According to Nokishita, the SA ring controls spherical aberration for bokeh adjustment. Magnification up to 1.4x.

 

[John Wilde]

According to Nokishita, the SA ring controls spherical aberration for bokeh adjustment. Magnification up to 1.4x.

 

[chrysoberyl]

So far they are. The setting is in the body, not the lens.View attachment 196860

An interesting implementation. I'll have to rent this lens and a body at some point to see whether I like it, because focus by wire has consistently disappointed me thus far, and I almost always focus manually.

Thank you for the information!

 

[Sludz]

Essentially would blur corners more and split the light spectrum. I can’t imagine you would want to control this aside from I don’t think you can control it. Canon is using a special blue coating that helps realign the spectrum.

This didn’t age well

 

[miketcool]

This didn’t age well

Chromatic aberration and spherical aberration are the same thing right?

I followed this up with the Nikon 105mm DC lens that has the same ability to adjust spherical aberration. It’s helpful in portraiture when you stop down because of the narrow range of DoF. I still can’t see the benefit in Macro shooting. To Canon’s credit, the EF 100mm macro likely sold more copies for portrait work than macro work with it’s cheap complaint being harsh bokeh stopped down. At least portrait shooters have an expensive tool to add to their bag.