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Beyond is the info I found so far regarding this mode. So far, no definitive conclusion can be made regarding your problem... but I would venture to say that legacy lenses seem to have no aperture limitation.

##From the manual, no aperture limitation##

The manual of the Olympus OM-D E-M1 Mark II doesn't provide any hint about aperture limitation when using High Res Shot. The dedicated section can be found page 48 and page 99.

The only parts related to High Res Shot's limitation can be found on the following pages:

• Page 91:

Bracketing can not be combined with HDR, interval-timer photography, digital shift, multiple-exposure photography, or high res shots.

• Page 97:

The following is not available while keystone compensation is in effect : [...] High Res Shot

##From Internet: no aperture limitation ?!##

This website gets more in depth about how the High Res Shot mode works. Aperture is mentioned 13 times, mostly about focus shifting issues when stopping down a lens BUT, in the commentary you can read:

With native lenses you are limited to f8 or wider, legacy lenses can be used at whatever aperture you like of course.

So it seems that legacy lenses can be used!

This website, apparently from on Olympus employee, indicates:

Camera settings limitations: shutter speed not longer than 8 sec, aperture not narrower than F8, ISO not higher than 1600 and flash sync not faster than 1/50sec (previously in E-M5 Mark II or PEN-F, flash sync limit was 1/20sec)

Ok, no precision regarding the type of lens...

This page says, when using High Res Shot mode (lens not mentioned):

No aperture we tried (from f/2.8 to f/8) was able to begin resolving any of dots with the E-M5 II, so diffraction limiting is not to blame.

It only confirms that High Res Shot mode is working at least from f/2.8 to f/8.

##Conclusion##

No clear indication regarding fully manual legacy lenses that don't report aperture to the camera... but I would venture to say that legacy lenses seem to have no aperture limitation.

Beyond is the info I found so far regarding this mode. So far, no definitive conclusion can be made regarding your problem... but I would venture to say that legacy lenses seem to have no aperture limitation.

From the manual, no aperture limitation

The manual of the Olympus OM-D E-M1 Mark II doesn't provide any hint about aperture limitation when using High Res Shot. The dedicated section can be found page 48 and page 99.

The only parts related to High Res Shot's limitation can be found on the following pages:

• Page 91:

Bracketing can not be combined with HDR, interval-timer photography, digital shift, multiple-exposure photography, or high res shots.

• Page 97:

The following is not available while keystone compensation is in effect : [...] High Res Shot

From Internet: no aperture limitation ?!

This website gets more in depth about how the High Res Shot mode works. Aperture is mentioned 13 times, mostly about focus shifting issues when stopping down a lens BUT, in the commentary you can read:

With native lenses you are limited to f8 or wider, legacy lenses can be used at whatever aperture you like of course.

So it seems that legacy lenses can be used!

This website, apparently from on Olympus employee, indicates:

Camera settings limitations: shutter speed not longer than 8 sec, aperture not narrower than F8, ISO not higher than 1600 and flash sync not faster than 1/50sec (previously in E-M5 Mark II or PEN-F, flash sync limit was 1/20sec)

Ok, no precision regarding the type of lens...

This page says, when using High Res Shot mode (lens not mentioned):

No aperture we tried (from f/2.8 to f/8) was able to begin resolving any of dots with the E-M5 II, so diffraction limiting is not to blame.

It only confirms that High Res Shot mode is working at least from f/2.8 to f/8.

Conclusion

No clear indication regarding fully manual legacy lenses that don't report aperture to the camera... but I would venture to say that legacy lenses seem to have no aperture limitation.

##From the manual, no aperture limitation?##

The manual of the Olympus OM-D E-M1 Mark II doesn't provide any hint about aperture limitation when using High Res Shot. The dedicated section can be found page 48 and page 99.

The only parts related to High Res Shot's limitation can be found at the following pages:

• Page 91:

Bracketing can not be combined with HDR, interval-timer photography, digital shift, multiple-exposure photography, or high res shots.

• Page 97:

The following is not available while keystone compensation is in effect : [...] High Res Shot

##From Internet: no aperture limitation !##

This website gets more in depth about how the High Res Shot mode works. Aperture is mentioned 13 times, mostly about focus shifting issues when stopping down a lens BUT, in the commentary you can read:

With native lenses you are limited to f8 or wider, legacy lenses can be used at whatever aperture you like of course.

So it seems that legacy lenses can be used!

This page says, when using High Res Shot mode (lens not mentioned):

No aperture we tried (from f/2.8 to f/8) was able to begin resolving any of dots with the E-M5 II, so diffraction limiting is not to blame.

So it confirms that High Res Shot mode is working at least from f/2.8 to f/8.

Beyond is the info I found so far regarding this mode. So far, no definitive conclusion can be made regarding your problem... but I would venture to say that legacy lenses seem to have no aperture limitation.

##From the manual, no aperture limitation##

The manual of the Olympus OM-D E-M1 Mark II doesn't provide any hint about aperture limitation when using High Res Shot. The dedicated section can be found page 48 and page 99.

The only parts related to High Res Shot's limitation can be found on the following pages:

• Page 91:

Bracketing can not be combined with HDR, interval-timer photography, digital shift, multiple-exposure photography, or high res shots.

• Page 97:

The following is not available while keystone compensation is in effect : [...] High Res Shot

##From Internet: no aperture limitation ?!##

This website gets more in depth about how the High Res Shot mode works. Aperture is mentioned 13 times, mostly about focus shifting issues when stopping down a lens BUT, in the commentary you can read:

With native lenses you are limited to f8 or wider, legacy lenses can be used at whatever aperture you like of course.

So it seems that legacy lenses can be used!

This website, apparently from on Olympus employee, indicates:

Camera settings limitations: shutter speed not longer than 8 sec, aperture not narrower than F8, ISO not higher than 1600 and flash sync not faster than 1/50sec (previously in E-M5 Mark II or PEN-F, flash sync limit was 1/20sec)

Ok, no precision regarding the type of lens...

This page says, when using High Res Shot mode (lens not mentioned):

No aperture we tried (from f/2.8 to f/8) was able to begin resolving any of dots with the E-M5 II, so diffraction limiting is not to blame.

It only confirms that High Res Shot mode is working at least from f/2.8 to f/8.

##Conclusion##

No clear indication regarding fully manual legacy lenses that don't report aperture to the camera... but I would venture to say that legacy lenses seem to have no aperture limitation.

The manual of the Olympus OM-D E-M1 Mark II doesn't provide any hint about aperture limitation when using High Res Shot. The dedicated section can be found page 48 and page 99.

The only parts related to High Res Shot's limitation can be found at the following pages:

• Page 91:

Bracketing can not be combined with HDR, interval-timer photography, digital shift, multiple-exposure photography, or high res shots.

• Page 97:

The following is not available while keystone compensation is in effect : [...] High Res Shot

The passage about bracketing might be the source of the confusion.

##From the manual, no aperture limitation?##

The manual of the Olympus OM-D E-M1 Mark II doesn't provide any hint about aperture limitation when using High Res Shot. The dedicated section can be found page 48 and page 99.

The only parts related to High Res Shot's limitation can be found at the following pages:

• Page 91:

Bracketing can not be combined with HDR, interval-timer photography, digital shift, multiple-exposure photography, or high res shots.

• Page 97:

The following is not available while keystone compensation is in effect : [...] High Res Shot

##From Internet: no aperture limitation !##

This website gets more in depth about how the High Res Shot mode works. Aperture is mentioned 13 times, mostly about focus shifting issues when stopping down a lens BUT, in the commentary you can read:

With native lenses you are limited to f8 or wider, legacy lenses can be used at whatever aperture you like of course.

So it seems that legacy lenses can be used!

This page says, when using High Res Shot mode (lens not mentioned):

No aperture we tried (from f/2.8 to f/8) was able to begin resolving any of dots with the E-M5 II, so diffraction limiting is not to blame.

So it confirms that High Res Shot mode is working at least from f/2.8 to f/8.