December 18, 2017, 04:07:58 AM

Author Topic: Tamron Announces the 100-400mm f/4.5-6.3 Di VC USD, Available November 16  (Read 4615 times)

AJ

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Re: Tamron Announces the 100-400mm f/5-6.3 Di VC USD, Available November 16
« Reply #15 on: October 27, 2017, 12:06:11 PM »
Not fond of the f/6.3 aperture at 400, but that's necessary to produce the smaller lens. It will be interesting to see how it performs vs. the Sigma.
If they made these just for EFS wouldnt it be about this size but larger effective aperature? One wonders why there are so few EFS long lenses when most are probably sold to owners of that mount cameras anyway.
No not for telephoto lenses.
For this lens, 400 mm / 67 mm front element size yields f/6.3.  This is irrespective of the imaging circle.
An f/5.6 lens will have a front element of 400 mm / 5.6 = 72 mm minimum front element size.
This is why telephoto lenses typically have the larger imaging circle covering 35 mm.  There's no advantage to only cover APSC.

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Re: Tamron Announces the 100-400mm f/5-6.3 Di VC USD, Available November 16
« Reply #15 on: October 27, 2017, 12:06:11 PM »

Talys

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Re: Tamron Announces the 100-400mm f/5-6.3 Di VC USD, Available November 16
« Reply #16 on: October 27, 2017, 12:43:36 PM »
About this lens... price looks great.  Assuming the IQ is also great, autofocus speed, accuracy and consistency is going to be what makes or breaks it.

Stabilization as well. According to reviews that's not the strongest suit of the Sigma counterpart.

Yes, true -- especially at f/6.3, you'll at least need a couple of good IS stops to get decent handheld shots.

I played with the Sigma at a camera store, and it felt nice enough, but it's not really a competitor to the Canon 100-400LII for handheld shooting.  f/6.3 autofocus is a real downgrade from f/5.6, sadly.  And, I mean on the same lens -- the AF is much better when zoomed out to allow f/5.6 than when it's in the f/6.3 range. 

I think what these really compete with is the 150-600's by Tamron/Sigma, as a lighter alternative to them.

AlanF

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Re: Tamron Announces the 100-400mm f/5-6.3 Di VC USD, Available November 16
« Reply #17 on: October 27, 2017, 01:15:48 PM »
About this lens... price looks great.  Assuming the IQ is also great, autofocus speed, accuracy and consistency is going to be what makes or breaks it.

Stabilization as well. According to reviews that's not the strongest suit of the Sigma counterpart.

Yes, true -- especially at f/6.3, you'll at least need a couple of good IS stops to get decent handheld shots.

I played with the Sigma at a camera store, and it felt nice enough, but it's not really a competitor to the Canon 100-400LII for handheld shooting.  f/6.3 autofocus is a real downgrade from f/5.6, sadly.  And, I mean on the same lens -- the AF is much better when zoomed out to allow f/5.6 than when it's in the f/6.3 range. 

I think what these really compete with is the 150-600's by Tamron/Sigma, as a lighter alternative to them.

The guy who comes last in the 400m sprint is still a competitor of the guy who comes first as both are in the same distance race. The Sigma and Tamron are direct competitors of the Canon 100-400mm, although they come second and third in terms of build and AF but 1st and 2nd in terms of price and weight. I think the 100-400s complement the 150-600mms rather than compete with them.
5D IV, 5DS R, 400mm DO II, 1.4xTC III, 2xTC III, EF 1.8 STM,  EF 24-105, 100-400 II, EF-S 15-85, Sigma 150-600mm C, EOS-M5 15-45, f/2 22, 11-22, Samyang 8mm f/2.8 fisheye: sold 7D II, EOS-M, Powershot G3 X,  Sigma 10-20, EF 300/2.8 II, 70-200/4 IS.

pknight

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Re: Tamron Announces the 100-400mm f/5-6.3 Di VC USD, Available November 16
« Reply #18 on: October 27, 2017, 09:55:06 PM »
Is the tripod mount an extra? It's described as optional and not listed as an accessory (but neither is the rear cap).

IIRC, a tripod mount is not even an option with the Sigma 100-400.  Better to have it as an option than for it not even being a possibility.

Talys

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Re: Tamron Announces the 100-400mm f/5-6.3 Di VC USD, Available November 16
« Reply #19 on: October 29, 2017, 01:46:26 AM »
The guy who comes last in the 400m sprint is still a competitor of the guy who comes first as both are in the same distance race. The Sigma and Tamron are direct competitors of the Canon 100-400mm, although they come second and third in terms of build and AF but 1st and 2nd in terms of price and weight. I think the 100-400s complement the 150-600mms rather than compete with them.

What I mean, is, in generally, if someone is looking for a 400mm+ zoom and sub $1k is a comfortable price range, I don't think they'd consider a Canon.  OTOH, if someone is seriously in the market for a $2k 400mm, I think they'd feel lik they were settling if they took a Sigma/Tamron 5-6.3. 

You're absolutely right that someone might have both a Sigma/Tamron 100-400 and a 150-600.  I was thinking more along the lines of a person's first long telephoto zoom -- which both appeal to -- they'd consider smaller and easier to shoot handheld + cheaper filters versus 600mm max.

KevinP

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Re: Tamron Announces the 100-400mm f/5-6.3 Di VC USD, Available November 16
« Reply #20 on: November 09, 2017, 12:45:47 AM »
For this lens, 400 mm / 67 mm front element size yields f/6.3.  This is irrespective of the imaging circle.
An f/5.6 lens will have a front element of 400 mm / 5.6 = 72 mm minimum front element size.
This is why telephoto lenses typically have the larger imaging circle covering 35 mm.  There's no advantage to only cover APSC.

Do you have a good source where I can go read on these relationships?  There's a non-intuitive thing going on if that's the whole answer.  Is there a focal length range where lenses are f-stop limited, and a shorter focal range where they're coverage circle limited?

I see a lot on f-number ratio, but I don't see a lot on the actual aperture position.  Is it a theoretical aperture size at the front element? 

Most of the articles I find are piece-meal, with few or no illustrations to clarify what's happening. 
« Last Edit: November 09, 2017, 12:56:37 AM by KevinP »

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Re: Tamron Announces the 100-400mm f/5-6.3 Di VC USD, Available November 16
« Reply #20 on: November 09, 2017, 12:45:47 AM »