Novoflex Leica L/T to Nikon F Adapter on my Leica SL2-S

[bherman01545]

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All;

Many of my questions were answered on an 8-year-old thread, but now my latest one  - 

I have another couple of questions now that (with your help) I've mostly figured out the Novoflex LET/NIK adapter.

1.) If I turn the blue ring to the large "O", it lets me view the image with what appears to be open aperture, but when I turn the actual aperture ring on the lens, it doesn't change the exposure. It is only when I turn the lens to the small "o", it recognizes the changes in aperture, but it looks like stopped down metering - i.e. setting the aperture to F/16 darkens the image in the EVF, so I really need to focus and compose with the lens aperture wide open and then stop down or set the aperture accordingly, correct?

2.) The other question related directly to the menu settings in my Leica SL2-S. I stumbled upon this after mounting the Novoflex adapter and my 55mm Micro Nikkor lens. I noticed that Image Stabilization is grayed out in the menu. I called my local Leica store, and we pretty much figured this out together. 

To fix the IS issue:

• Go to Page 4 in the menu
• Camera Settings>Lens Profiles,>other profiles
• Put in Focal Length of the lens, e.g. 55mm
• Image stabilization is now ‘on’
• Then Save the User Profile, e.g. NIKKOR MF

There are no in-camera automatic adjustments (lens corrections made) simply by inputting the focal length. The camera doesn't know which lens I'm using, right? 

When I punch in the specific focal length, does the camera do anything specific with that - if I were to input 28mm or 55mm? 

Thanks again!

-Brad

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[BernardC]

15 hours ago, bherman01545 said:

There are no in-camera automatic adjustments (lens corrections made) simply by inputting the focal length. The camera doesn't know which lens I'm using, right? 

When I punch in the specific focal length, does the camera do anything specific with that - if I were to input 28mm or 55mm? 

There is no lens-correction applied for two reasons. First, the camera doesn't know anything about the lens you attached, other than the focal length. It could be a macro, like your lens, or an old-school 55/1.2. Second, lens correction, as implemented by Leica, is a way to correct for some characteristics of rangefinder lenses when used on digital sensors. It's not trying to improve the lens, just to make older M lenses perform like they did on film.

The focal length is used to calculate the amount of IBIS needed. The camera knows how much it is moving, but it also need to know the image magnification in order to counteract that shake. One thing to note: you may get better results with your Micro lens by inputting a longer focal length at high magnifications. Classic macro lenses extend the helical at close focus, so your 55 is effectively a 110 at 1:1 (if it goes that far). I believe that the old Nikkor 55 only goes to 1:2, but that would be the equivalent of around 70mm, as far as stabilization is concerned.

Modern internal-focus macros work more like zooms. Many (but not all) decrease the focal length at high magnifications.