100-400 mk2 vs sigma 150-600

[paulbrogden10]

Hi all been thinking about the sigmas 150-600 both s and c vs 100-400 mk2 any comments the sigmas are cheaper and have much longer reach.

sigma c 150-600 £750

sigma s  150-600 £1200

Canon 100-400 mk2 £1400-1700

The sigma c seems a bargin dont it?

[Waddizzle]

"You make a valid point. But truthfully, I've never seen that advertised as an advantage of a battery grip."

Honesty, I have never seen them advertised that way either. Usually it's all about having the buttons for portrait mode.

Batteries are capable of outputting only so much maxium current per unit of time.  The larger the load, the more the source voltage drops when the load is being fed.  The more the source voltage drops, then more current must be delivered to maintain a given power level of power being delivered.  An inadequate source of battery power is a downward spiral until it discharges itself.

[TTMartin]

---

@Waddizzle wrote:

"You make a valid point. But truthfully, I've never seen that advertised as an advantage of a battery grip."

Honesty, I have never seen them advertised that way either. Usually it's all about having the buttons for portrait mode.

Batteries are capable of outputting only so much maximum current per unit of time.  The larger the load, the more the source voltage drops when the load is being fed.  The more the source voltage drops, then more current must be delivered to maintain a given power level of power being delivered.  An inadequate source of battery power is a downward spiral until it discharges itself.

---

Exactly, a battery grip puts two batteries in parallel. So when a load is applied there is less voltage drop since the load is applied across both batteries, instead of just to one.

[paulbrogden10]

TTmartin I was using battery grips on both cameras when testing these lenses has any one out their exsperienced very slow focus with the 7D on the 100-400II?

[paulbrogden10]

I use battery grips on my cameras all the time.

[TTMartin]

---

@paulbrogden10 wrote:

TTmartin I was using battery grips on both cameras when testing these lenses has any one out their exsperienced very slow focus with the 7D on the 100-400II?

---

Were they genuine Canon grips or 3rd party grips?

In theory it shouldn't make a difference. But, as we know 'In theory, there is no difference between theory and practice. But, in practice, there is.'

[paulbrogden10]

I only use orginal canon ones

[Waddizzle]

---

@paulbrogden10 wrote:

I only use orginal canon ones

---

There are a few factors that can determine how long your batteries last. 

Cold temperatures are not good for long battery life.

Lots of focusing in AI Servo mode can shorten battery life.

The constant activity of the IS motors can shorten battery life.

Extended use of the LCD screen [reviewing images and historgrams] shorten battery life.

No doubt there are more, but that's what popped into my head as I devour my lunch. [Pizza, spinach and garlic]

[TTMartin]

---

@Waddizzle wrote:

The constant activity of the IS motors can shorten battery life.

---

I do use Mode 3 IS with my EF 100-400 L IS II, I'm not sure if that has a positive impact on battery life or not.

[Waddizzle]

---

@TTMartin wrote:

---

@Waddizzle wrote:

The constant activity of the IS motors can shorten battery life.

---

I do use Mode 3 IS with my EF 100-400 L IS II, I'm not sure if that has a positive impact on battery life or not.

---

There is one settings that can have an impact on lens performance, and battery drain.  It is "Lens Drive When AF Impossible".  I had noticed noises coming from my Sigma 150-500mm lens, and realized that just merely walking around the OS system was trying to function. 

You didn't even need to press the shutter.  As long as the camera was "awake", the stabilization systems would remain active.  I noticed two things could stop it.  One was disabling the aforementioned "Lens Drive" option, or enabling a back button to turn on/off the IS system, just like you would for the AF system. 

The above is from the instruction manual for the 5D3.  This "IS" function assignment is found in many camers, including the 6D.  I tried it, and it seemed to stop the lens from making motor noises while carrying it.  But, this was too many buttons to be pushing while handholding a heavier lens like the Sigma 150-500mm. 

[RobertTheFat]

---

@TTMartin wrote:

---

@Waddizzle wrote:

The constant activity of the IS motors can shorten battery life.

---

I do use Mode 3 IS with my EF 100-400 L IS II, I'm not sure if that has a positive impact on battery life or not.

---

Don't lose focus, Guys. Battery life isn't the issue, is it? It's the ability (or not) of a single unassisted camera battery to supply enough current to drive a large lens's autofocus motor at its rated speed.