Deeper f/stop Q's
I understand what the numbers mean and what they do. I can control depth of field, I love my nifty fifty, my slow 18-200mm tweaks my melon in lower light action sometimes...but why, please explain...
WHY CANNOT EVERY LENS BE OPENED RIGHT UP TO F/1? :dunno Why not? If your lens had poor light transmission, wouldn't you want it to get more light by opening the aperature? :dunno
pls 'splain. Thanks,
VI
WHY CANNOT EVERY LENS BE OPENED RIGHT UP TO F/1? :dunno Why not? If your lens had poor light transmission, wouldn't you want it to get more light by opening the aperature? :dunno
pls 'splain. Thanks,
VI
0
Comments
pyroPrints.com/5819572 The Photo Section
Here is a sample of a relatively simple lens: my 200/2.8 has a filter diameter of 72mm. 200mm/2.8 = 71.4mm.
Large objectives are hard to manufacture. For telephoto lenses, you'll find that the objective diameter is a fairly good predictor of the price of the lens. In particular, lenses objectives larger than around 77mm tend to be frighteningly expensive.
And heavy!
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The real answer is that manufacturers already make most lenses in as fast an aperture as most folks are willing to pay. Check out the price difference between the Canon EOS 85mm f1.8 and the 85mm f1.2 L - The price quadruples, and in many ways the cheaper lens is the better lens in terms of size, weight, and focusing speed.
The market for lenses that cost more than $2K or $3K apiece is pretty small unless you are spending OPM (other people's money) - that is to say, only governments are willing to spend unlimited sums to shoot pictures in very low light.:D It is cheaper to buy a good Speedlite.
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VI: less confused, and now loaded with more (to my friends) UFI
Canon 40d | Canon 17-40 f/4L | Tamron 28-75mm f/2.8 | Canon 50mm f/1.8 | Canon 70-200mm f/4 L
Imagine how truly huge that thing would have been at f1.0? You'd need a truck to move it, and a second mortgage to buy it (not like this one doesn't).
http://www.chrislaudermilkphoto.com/