Compactness & Weight
At this point you are probably thinking that the Zuikos look quite a bit smaller and they are, as evidenced below.
However, there is a fly in this pro-Zuiko ointment and it is down to the adaptors. The Flange-focal distance of the Canon FD lenses is shorter than the Zuikos, meaning that the Canon FD to NEX adaptor is quite a bit shorter. The below photo shows the Canon 28mm f2.8 mounted on its adaptor next to the Olympus 28mm f3.5 on its. As you can see, there is no more than about 5mm in it and unless you are window licking nuts, that just isn’t worth worrying about.
True, packed into a bag, the Zuikos will take up less space than the Canons, but good luck making compartments that small with most bags. The truth is, the bags are going to be the same size, although at a push you might just be able to fit one more Zuiko lens in at a push out of, say, a 5 lens outfit.
Just by way of comparison, here are some photos of Canon FDn lenses shown against native FE Sony/Zeiss lenses:
And it is not quite as overwhelmingly in favour of the Zuikos as expected, when we consider weight. Based on internet posted weights, a comparable outfit of 20/21mm, 28 2.8, 50 1.4 and 85 1.8/2 comes in at 1055g for the Canons and 855g for the zuikos. That 200g difference is as a result of the differences in the 20/21mm and 85mm lenses. Compare a 24, 35 and 50mm outfit and the Canon comes out a little lighter.
A 24, 35, 50, 85 outfit comes in at 985g for the Canons and 915g for the Zuikos, but I’m not convinced by the internet weights in all cases. Placed on the palm of your hand (so bulk does not skew things) the Zuiko 28 3.5 feel clearly heavier than the Canon 28 2.8, yet they are supposed to be within 10g of each other. Whichever way you look at it, there is not a lot in it. Under most circumstances the OM kit will weigh a touch less, but not necessarily.
Now there is the adaptor’s weight. The Canon FDn to NEX adaptor is shorter and also has much thinner walls (see below photos). With the Novoflex examples I have, I would say the Zuiko OM adaptor is a good 50% heavier.
So all in, the Canon FDn outfit is not going to weigh much (if any) more than the Zuiko OM and the bulk difference does not seem significant to me (especially on camera). There won’t really be any difference to the volume of bag required either, so a sound decision is going to have to be based on other factors.
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