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Thread started 19 Feb 2017 (Sunday) 10:34
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New Sigma lenses

 
DarthVader
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Feb 21, 2017 22:40 as a reply to post 18281141 |  #31

You are richer than most people in the poor country :)


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Ah-keong
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Feb 22, 2017 20:38 |  #32

I must say it is an expensive hobby for me.
If Sigma release the 105mm Makro lens.... wow.

I got to rob the bank to pay for all these poison.... :-D


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KenjiS
"Holy crap its long!"
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Feb 26, 2017 01:56 |  #33

I'd love Sigma to do a crazy new macro lens of some type...

Maybe bump the aperture on a 105 to f/2 or something, make it 2:1... built in macro LED light? :D


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ma11rats
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Feb 26, 2017 11:17 as a reply to KenjiS's post |  #34

Why would you want a faster macro lens? DOF is already tiny with an f2.8 lens. Stopping down to f11 rarely gets enough in focus. The best resulting macro images are usually a stacked set of images. A 105 f2 macro doesn't make sense, it'd be huge and you'd never/rarely use it at f2. You might, might, get one of the setting prongs on a ring completely sharp, but you'd never get the whole diamond in focus. You might get part of an eye on an insect in focus but you'd never get the whole insect in focus.

I like the idea of a light built in but the issue with adding a light at the end of the barrel is loss of contrast and inducement of flare if the light is near the first element. They would have to raise it up a bit like the eos m 28mm macro or make it like how a ring-light attaches to the front of the lens. An LED light to cover the size of a FF lens would have be WAY bigger than the lens to be powerful enough to actually illuminate your subject, especially at f11 or so. Think of the power that ring-lights emit. It's basically a speedlite, way more than a tiny strip LED.

I think a 180mm lens would make more sense for a 2:1 lens. You'd have a lot more working distance with a 180 over a 100 and you'd need WAY more light at the same settings if you're doubling the magnification. I think it'd be very cool, but not a lot of customers would know how to use it properly. Take the Canon macro 1-5 http://www.the-digital-picture.com ...5x-Macro-Lens-Review.aspx (external link)


I like your thinking out of the box though!


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KenjiS
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Apr 27, 2017 00:28 |  #35

ma11rats wrote in post #18285615 (external link)
Why would you want a faster macro lens? DOF is already tiny with an f2.8 lens. Stopping down to f11 rarely gets enough in focus. The best resulting macro images are usually a stacked set of images. A 105 f2 macro doesn't make sense, it'd be huge and you'd never/rarely use it at f2. You might, might, get one of the setting prongs on a ring completely sharp, but you'd never get the whole diamond in focus. You might get part of an eye on an insect in focus but you'd never get the whole insect in focus.

I like the idea of a light built in but the issue with adding a light at the end of the barrel is loss of contrast and inducement of flare if the light is near the first element. They would have to raise it up a bit like the eos m 28mm macro or make it like how a ring-light attaches to the front of the lens. An LED light to cover the size of a FF lens would have be WAY bigger than the lens to be powerful enough to actually illuminate your subject, especially at f11 or so. Think of the power that ring-lights emit. It's basically a speedlite, way more than a tiny strip LED.

I think a 180mm lens would make more sense for a 2:1 lens. You'd have a lot more working distance with a 180 over a 100 and you'd need WAY more light at the same settings if you're doubling the magnification. I think it'd be very cool, but not a lot of customers would know how to use it properly. Take the Canon macro 1-5 http://www.the-digital-picture.com ...5x-Macro-Lens-Review.aspx (external link)


I like your thinking out of the box though!

Sorry for the late reply

More because sometimes I use a macro lens for non-macro things, it would make it more of a dual purpose lens basically

My only experience with a ringlight wasnt terribly positive, I preferred using my 580EX off camera on a cord, but it met the concrete and is dead now.. Have yet to decide what im replacing it with...


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