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TT artisan 25mm f/2.0 on Canon RF mount experiences?

Started 4 months ago | Questions thread
Sittatunga Veteran Member • Posts: 5,406
Re: TT artisan 25mm f/2.0 on Canon RF mount experiences?
1

Wiedehopf wrote:

Dear R community. Recently it seems that TT Artisans have added an RF-mount version of their new 25mm f/2 manual lens (for $65 or €75!). https://www.dpreview.com/news/6963154172/ttartisan-releases-55-25mm-f2-lens-for-aps-c-camera-systems

I was looking for a very lightweight, compact (basically 'pancake') around 30-40mm for my RP. Not so worried that its an APS-C rather than a FF.

Have never used an MF (totally manual) lens on my Canons (100D, 60D and since 2 weeks an RP) so I have some beginners questions:

1. there is no electrical contacts on this lens; to get the correct exposure do I have to set manually on my RP the same aperture as on the lens, or with TTL it just knows what exposure to use?

The camera can't set the aperture on a lens when it knows that there isn't one mounted because it's not getting an electronic response from the mount - the EXIF data will record F00 anyway. That means you can't use TV or P modes at all, and Av mode is basically what Canon used to call "Stopped-down Av mode" 40-odd years ago with the A-1. Auto ISO will work on Av and M modes. Apart from the auto ISO, it's a vintage experience working with lenses like these, which is fun, in a back-to-the-60s way.

2. To set up the RP to use a manual lens I need to a) set 'focus mode' to manual (shoot/menu tab 7) b) enable MF peaking setting (Shoot/tab 8) and then enable 'release shutter without lens' (C.Fn/Cust Fct III/tab 7).

Focus peaking on the EOS R (and the M100) lights up over an in-focus range at least two stops wider than the depth of field for an A4 print at the aperture you're using, so I don't find it quick for critical focussing. It's either back-to-the-60s, focus wide open then stop down manually to the working aperture, or a bit of see-sawing to get the middle of the focus peaking range to your point of interest. I prefer focus magnification for critical focus, but that makes framing a moving subject tricky.

Anything else to do?

Set crop mode, as this is a crop format lens for the R10 and the R7. You'll get nearly 10Mpx rather than the 18Mpx from your 100D, but that's still more than enough for an A4 print. You might be able to crop a bit wider from full-frame, depending on how sharp and bright you like your corners and how far you've stopped down.

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