there is no optics from any manufacturer except the old nikonos UW camera optics that would make the list. putting feather edge seals on a lens and some O rings on a body will not prevent long term infiltration due to the mechanical movement. primes would be the closest due to their very limited external movements but if there is a need to change them out let us say you have to \"open that can of worms\" when you get to it.
there is a lot to determine like what will be your exposure level and time involvment.
there is no optics from any manufacturer except the old nikonos UW camera optics that would make the list. putting feather edge seals on a lens and some O rings on a body will not prevent long term infiltration due to the mechanical movement. primes would be the closest due to their very limited external movements but if there is a need to change them out let us say you have to \"open that can of worms\" when you get to it.
there is a lot to determine like what will be your exposure level and time involvment.
