Question about a theoretical lens.

CanonFanBoy

Really O.K. Boomer
Jan 28, 2015
4,962
2,969
Irving, Texas
I'm not saying this will ever happen, but there are a lot of smart guys here who will know how to calculate this. I'm wondering what the size (front filter thread or front element?) of a 70-135 f/1.8, f/2 or 70-150mm might be, and whether or not it would be even practical from a size point of view. With what Canon has been producing lately, I am wondering whether there is a possibility that Canon would make a shorter zoom than a 70-200 f/2.8 with a wider aperture. For a guy that focuses almost exclusively on portraits, model boot camps, or fashion show runways, something faster and shorter would be really nice in a zoom, from my perspective.
 

AlanF

Stay alert, control the camera, save photos
Aug 16, 2012
6,665
5,491
The minimum diameter for a front element for a 70-135 f/1.8 would be 75mm, at f/2 would be 67.5mm, and for 70-150mm would be 83.3mm for f/1.8 and 75mm for f/2.
 

SecureGSM

2 x 5D IV
Feb 26, 2017
2,029
940
The minimum diameter for a front element for a 70-135 f/1.8 would be 75mm, at f/2 would be 67.5mm, and for 70-150mm would be 83.3mm for f/1.8 and 75mm for f/2.
Would be around 105mm in Sigma Art money :)

The Sigma 50-100/1.8 Art (APS-C) thread filter
Size : 82mm

Sigma 105mm/1.4 Art (Monstrosity) - 105mm

I have got one up for sale for months and not a single punter. they all run away as soon as the lens being taken out of the box. It is a scary large 105mm prime. :D
 
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