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<blockquote data-quote="Brian" data-source="post: 248287" data-attributes="member: 17621">I guess to be very specific, using the adapter changes the effective focal length of the combined lens. You could also change the spacing between elements in a lens to change the focal length, or add auxiliary lenses to change the effective focal length of the combined optics. I turned a Canon 50/0.95 RF lens into a 35/1.2 retro-focus wide-angle lens for the Nikon F using large negative elements in front of the lens and an extension tube in back. I was not going to nit-pick for a conversation at this level, the OP posted a question- I tried to keep the answer simple. The &quot;wide-converter&quot; reduces the image circle, which increases the effective aperture as well. Nikon made a DSLR in the 1990s with built in reduction optics that sat at the image plane of the lens, it reduced/projected the image to a 2/3&quot; sensor. Nikon rated the ISO of the sensor much higher than it's native rating to compensate for the increase in brightness of the image circle.For the OP- get a 35/1.8 DX lens. That will get close to using a 50mm lens on a FX body.</blockquote>

[QUOTE="Brian, post: 248287, member: 17621"] I guess to be very specific, using the adapter changes the effective focal length of the combined lens. You could also change the spacing between elements in a lens to change the focal length, or add auxiliary lenses to change the effective focal length of the combined optics. I turned a Canon 50/0.95 RF lens into a 35/1.2 retro-focus wide-angle lens for the Nikon F using large negative elements in front of the lens and an extension tube in back. I was not going to nit-pick for a conversation at this level, the OP posted a question- I tried to keep the answer simple. The "wide-converter" reduces the image circle, which increases the effective aperture as well. Nikon made a DSLR in the 1990s with built in reduction optics that sat at the image plane of the lens, it reduced/projected the image to a 2/3" sensor. Nikon rated the ISO of the sensor much higher than it's native rating to compensate for the increase in brightness of the image circle. For the OP- get a 35/1.8 DX lens. That will get close to using a 50mm lens on a FX body. [/QUOTE]

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