JGobeil
Nature Photographer
Quick test with the TN + Aperture control.
Without the Aperture adapter, the available diameter is 36mm. With the aperture fully opened, it is 25mm and it is 13mm half opened. There is a bit of vignetting at 13mm but it is easily corrected in LR, after that, vignetting kicks in big time.
First photo is with 13mm aperture, second one is 11mm.
3rd photo taken with an aperture opening of 13mm. Images with a 13mm aperture seem to have more contrast than when using the TN without the Aperture Adapter. I was surprised to see that there is no change in the amount of light reaching the camera. 36-25-13-11mm apertures all share the same settings: ISO 800, 1/4000 s.
4th photo is the SW80ED alone, no TN - ISO 800, 1/800 s.. All photos are untouched, except for resizing. TN assembly is 1.65X.
I'll try to test it on birds tomorrow but this quick test seems to indicate that results would be as good with a 13mm black cardboard diaphragm instead of the adapter. I can't see any benefits in being able to adjust the aperture.
Without the Aperture adapter, the available diameter is 36mm. With the aperture fully opened, it is 25mm and it is 13mm half opened. There is a bit of vignetting at 13mm but it is easily corrected in LR, after that, vignetting kicks in big time.
First photo is with 13mm aperture, second one is 11mm.
3rd photo taken with an aperture opening of 13mm. Images with a 13mm aperture seem to have more contrast than when using the TN without the Aperture Adapter. I was surprised to see that there is no change in the amount of light reaching the camera. 36-25-13-11mm apertures all share the same settings: ISO 800, 1/4000 s.
4th photo is the SW80ED alone, no TN - ISO 800, 1/800 s.. All photos are untouched, except for resizing. TN assembly is 1.65X.
I'll try to test it on birds tomorrow but this quick test seems to indicate that results would be as good with a 13mm black cardboard diaphragm instead of the adapter. I can't see any benefits in being able to adjust the aperture.