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Author Topic: More Sigma Primes Coming? [CR1]  (Read 14338 times)

GMCPhotographics

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Re: More Sigma Primes Coming? [CR1]
« Reply #15 on: March 13, 2011, 10:30:53 AM »
I hope Sigma update their 500mm f4.5 to be a true f4. The additonal OS system would be sweet but the real fun with a 500mm begins with a 1.4x TC...which would still AF well with an f4 design.

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Re: More Sigma Primes Coming? [CR1]
« Reply #15 on: March 13, 2011, 10:30:53 AM »

AJ

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Re: More Sigma Primes Coming? [CR1]
« Reply #16 on: March 14, 2011, 06:16:07 PM »
... and I think Sigma would do well to spec a 135 mm prime at f/1.8

MK5GTI

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Re: More Sigma Primes Coming? [CR1]
« Reply #17 on: March 15, 2011, 10:49:15 AM »
... and I think Sigma would do well to spec a 135 mm prime at f/1.8

that would require filter size in the 8xmm size

tzalmagor

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Re: More Sigma Primes Coming? [CR1]
« Reply #18 on: March 15, 2011, 02:13:12 PM »
... and I think Sigma would do well to spec a 135 mm prime at f/1.8

that would require filter size in the 8xmm size

Wouldn't 75mm suffice ?

AJ

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Re: More Sigma Primes Coming? [CR1]
« Reply #19 on: March 15, 2011, 03:04:31 PM »
... and I think Sigma would do well to spec a 135 mm prime at f/1.8

that would require filter size in the 8xmm size

Wouldn't 75mm suffice ?

Yes.  In practice you'll end up with a 77 mm filter.

Canon's 135/2 has a filter size of 72 mm.  Same as the 200/2.8

MK5GTI

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Re: More Sigma Primes Coming? [CR1]
« Reply #20 on: March 31, 2011, 11:40:44 AM »
... and I think Sigma would do well to spec a 135 mm prime at f/1.8

that would require filter size in the 8xmm size

Wouldn't 75mm suffice ?

Yes.  In practice you'll end up with a 77 mm filter.

Canon's 135/2 has a filter size of 72 mm.  Same as the 200/2.8

135 divided by 2 is only 67.5mm, with the barrel thickness, they end up with 72mm filter size
135 divided by 1.8 is already 75mm of opening, + barrel thickness, i don't think 77mm (+2mm) can do, thats diameter, not radius

neuroanatomist

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Re: More Sigma Primes Coming? [CR1]
« Reply #21 on: March 31, 2011, 11:55:43 AM »
Yes.  In practice you'll end up with a 77 mm filter.
Canon's 135/2 has a filter size of 72 mm.  Same as the 200/2.8
135 divided by 2 is only 67.5mm, with the barrel thickness, they end up with 72mm filter size
135 divided by 1.8 is already 75mm of opening, + barrel thickness, i don't think 77mm (+2mm) can do, thats diameter, not radius

It probably could, the barrel is not thicker than 1 mm (so 2 mm added to the diameter).  But it depends more on the optical design of the lens - my guess is that a larger diameter front element will be used to reduce vignetting, and an 82mm filter will be the result.  More lenses are coming with 82mm filters these days (Canon 16-35mm II, which I'll point out increased in diameter from the 77mm filter used on the MkI version of that lens), the TS-E 24mm II (and the MkI version of that lens used only a 72mm filter!). 

In that regard, I really hope B+W comes out with an 82mm ND 3.0 (10-stops) - well, I've been told that they will not, but their parent company, Schneider Optics, might...
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Re: More Sigma Primes Coming? [CR1]
« Reply #21 on: March 31, 2011, 11:55:43 AM »

Bob Howland

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Re: More Sigma Primes Coming? [CR1]
« Reply #22 on: April 01, 2011, 08:14:01 AM »
... and I think Sigma would do well to spec a 135 mm prime at f/1.8

that would require filter size in the 8xmm size


Wouldn't 75mm suffice ?

Yes.  In practice you'll end up with a 77 mm filter.

Canon's 135/2 has a filter size of 72 mm.  Same as the 200/2.8

135 divided by 2 is only 67.5mm, with the barrel thickness, they end up with 72mm filter size
135 divided by 1.8 is already 75mm of opening, + barrel thickness, i don't think 77mm (+2mm) can do, thats diameter, not radius

Nice try but 200 divided by 2.8 is 71.4mm and, as previously stated, the Canon version uses a 72mm filter

nounours18200

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Re: More Sigma Primes Coming? [CR1]
« Reply #23 on: April 02, 2011, 12:32:22 PM »
Quote
I hope Sigma update their 500mm f4.5 to be a true f4. The additonal OS system would be sweet but the real fun with a 500mm begins with a 1.4x TC...which would still AF well with an f4 design.

Me too: a supertele at a good price would be a best seller, but only if it is at a similar level of quality than the Canon 500/4... And this is maybe not a (so) easy challenge, because the level of quality to be reached is high, and the volume of sales not as high as for a basic 50mm...

The current Sigma 500/4.5 has two "problems" compared with the Canon 500/4 IS (not talking about the recent II version): it offers only f/4.5 so no AF when used with a x1.4TC and a non 1D body, and secondly its quality is not as high as the Canon... Despite its lower price, it is not enough to seriously challenge Canon on this top-class telephoto market .

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Re: More Sigma Primes Coming? [CR1]
« Reply #23 on: April 02, 2011, 12:32:22 PM »