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

highdesertmesa

R5 | 50R | Q | M
CR Pro
Apr 17, 2017
348
485
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I understand that, but there were clearly comments about soft focus, for example, and I don't see any reason why Canon would choose to include that human specific portrait feature on a macro lens of all things. Macro lenses are not at a loss for bokeh, the primary goal of most macro work is to get the most detail and depth of field out of a very shallow depth of field and often diffraction limited sharpness. No one is looking to smooth the skin of a fly.
Increasing spherical aberration would not be a soft focus effect, it would be control over bokeh rendering and focus falloff, which would be a unique and valuable tool. In the normal position, the lens would be closer to an APO design. Increasing SA would transform the lens into a completely different design more suited for artistic subject isolation.
 

jhpeterson

EOS RP
CR Pro
Feb 7, 2011
264
33
I'm likely to assume that SA stands for spherical aberration.

If so, it's one more feature to add to the mix of what is already a stellar performing lens, smoothing out those out-of-focus backgrounds and foregrounds. Not that it's the first lens I'll buy for my R1 bodies, but I'm sure I'll have to get one at some time.
 

HMC11

Travel
CR Pro
Sep 5, 2020
28
12
Assuming the 'SA' slider adds valuable additional capability for macro photography, Cannon is really pushing the boundary for the RF mount, and we should rejoice.....except for the price, that is. And, it looks like a costly one. 'SA' could well stand for 'Sanity Adjustments', ie. how far above or below the expected price one actually pays, which means the negative markings are an optical illusion.
 
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LostToFollowUp

I'm New Here
Apr 5, 2021
10
2
I would love if the SA is as others have guessed is "Scale Adjustment" as I would love to see it be capable of going 2:1 macro like the laowa lenses, it would be a grand slam I'd assume if this is the case as the last time we saw a canon macro lens with the ability to go beyond 1:1 macro was a very long time ago. On that note I'd even more love to see something capable of going up to 5:1 macro like the Canon MP E Macro 65mm F2/.8
 

Trout Bum

EOS R EOS M6 II
Aug 30, 2019
32
98
Are you aware that to macro photographers the photo of a plant or insect is actually a portrait, just not a portrait of a person? Can’t believe I have to even say that, LOL.
I can't believe that anyone could misinterpret the meaning of “portrait” on a photography forum. Yes, to you (and to me) a bug pic is a ”portrait”, but please...we know what was meant by that- portraits of human beings, LOL.
 

highdesertmesa

R5 | 50R | Q | M
CR Pro
Apr 17, 2017
348
485
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I can't believe that anyone could misinterpret the meaning of “portrait” on a photography forum. Yes, to you (and to me) a bug pic is a ”portrait”, but please...we know what was meant by that- portraits of human beings, LOL.

The EF version has been very popular for dual-use macro and (human) portraits. But whether we're talking about people, plants, insects, or objects, they all can benefit from having control over SA.
 

pape2

EOS 90D
Mar 19, 2021
116
147
SA could be startpoint adjuster for macro stacking. You can adjust startpoint what is different where autofocus is locked.
Like when shooting fly face from front, autofocus always hits too back to shoulder hairs, eyes stay out of focus.
i been using manual override for this with RP but its darn tricky.
 
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2Cents

I'm New Here
Nov 2, 2020
9
16
I'm not sure if that's "SA" or "5A", and I'm thinking "5 axis"


EDIT: nvm. I didn't read the original post properly.
Maybe "stabilization assistance", who knows...
It does look like "5A." Either way you might be on to something
 

Tangent

EOS 90D
Nov 13, 2015
137
93
Increasing spherical aberration would not be a soft focus effect, it would be control over bokeh rendering and focus falloff, which would be a unique and valuable tool. In the normal position, the lens would be closer to an APO design. Increasing SA would transform the lens into a completely different design more suited for artistic subject isolation.

I, too, like the slider idea, but, as you say, spherical aberration modification seems more likely. I read somewhere that Japanese macro photographers tend to favor a style of wide open shooting -- a narrow depth of field and an aesthetic management of bokeh. Given that predilection, it would make sense to seek to implement an enhanced capability in that direction. Keep the SA setting in the middle and use a rail for focus stacking, would be my guess. This new capability sounds rather intriguing, actually. Hypothetically.
 

LSeries

EOS 90D
Aug 14, 2014
136
10
Finland
jussilind.photography
Interesting... the lens looks fairly similar to the EF 100mm L IS f/2.8 macro (which I own).
Obviously the control ring at the front (a given) was going to be different / new.
The "SA Control" I am guessing is some ability to change the dynamics of spherical aberration perhaps?
If so, that's something new and quite interesting! I love my EF 100mm L IS macro... and had expected to use it with a RF-EF converter.
Though if there are certain benefits of the new RF 100mm f/2.8 lens, that may persuade me to buy it in time.... and use it instead!
I love my EF 100mm L IS f/2.8, too. It's also not that expensive so you can have the best of the best for your (macro) work - instead of buying budget lenses because you cannot afford some stupid expensive EF 600mm f/4L for birding.
 
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Oct 31, 2020
106
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When the patent for the macro lense hit the internet, I remember that especially some germans websites said it would a 1:1,4 macro. CR and CN said it was 1,4:1 macro. Maybe both were correct and the ring is indeed a "scale adjustment" so you can go from 1:1,4 to 1,4:1 and have a 1:1 macro if you wish. To me, this would make a lot of sense, but so do some of the other suggestions here.

But I'm very excited to see some real innovation with the added bonus of keeping us guessing until the lense is officially introduced :) please more of that Canon!
 
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Berowne

... they sparkle still the right Promethean fire.
Jun 7, 2014
312
181
I’m hoping it’s for “Slider Adjustment” or “Slider Advance”. The major missing feature in macro work is the ability to focus stack using just the lens. When you’re shooting magnified subjects, you often need to rely on a focus rail to incrementally slide the lens in and out to capture the narrow range in focus to stack. Simply moving the internal components in and out would achieve this control without the need of a rail and tripod. What a revolutionary idea this would be for macro shooting!!

EDIT:
Having looked at the patent, I’m gonna guess it does move the entire internal assembly in and out. SA could also be “Scale Adjustment” where you could change the magnification from 1:1 to 1.4:1 etc.
For stacking you have to slide camera and lens, ie the distance of the sensor plane to the object. Moving only the lens or parts of it inevitably changes the frame. This is useless for stacking.
 

Del Paso

M3 Singlestroke
Aug 9, 2018
1,141
1,186
I almost guarantee you that the SA adjustment ring is related to a macro function. It would make absolutely no sense for Canon to add excess portrait-related features to a professional high-end 1:1 macro lens, I know people use this for portraits, but the point of a 1:1 macro is... macro. I'm more willing to believe that the SA is for focus bracketing, or possibly for higher than 1:1 macro. Possibly "Step Adjustment control?"


Sidenote: It happens a 25mm extension tube gives you 1.4X life size on a 100mm macro. If the patent says there's a 1.4X macro, I wouldnt be surprised if this pulls off some sort of internal extension tube for bonus macro lengths.
But what would be the reason for those + and - markings on the lens-barrel ?
Spherical Adjustment could make more sense...
 
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