Canon EOS 7D Mark II Spec List [CR2]

[Sporgon]

The body is made of magnesium.

Air has a permeability of 1.000 000 37
Magnesium has a permiability of 1.000 12
Steel and iron are around 100
Mu-Metal, used for electromagnet shielding, is around 20,000 to 50,000

Think of permeability as the materials ability to react to (attenuate) radio signals.

In other words, the magnesium body is  for all practical purposes, transparent to electromagnetic waves (radio)..... and even if it wasn't, there are dozens of holes through the metal shell.

It has been a long time sense I took electrodynamics courses in collage but this just did not sound right.  This is true for the magnetic quality but magnesium is still conductive.  Air is not.   In fact aluminum is used for EMI shielding all the time and it has a permeability of 1.000021.  This is greatly dependent on frequency at 2.4 Ghz the penetration of electromagnetic waves or skin depth of magnesium is only around 5.7 micro-meter.  I would say that you will need a RF window for any wireless to work.  I imagine that 800 Mhz  would just go right through it. But we are talking wireless so that is 2.4 Ghz or higher.   Just because something is not magnetic does not mean that it is a poor at EMI shielding.

 

If you do not want to take my word for it I found a like to a company that makes magnesium alloy casting touting EMI shielding as one of the advantages.  It is named Wellcharter.  The site will not let me post the link here.

This kinda rings true with me: I don't think Canon would have used a plastic top plate on a $2000 camera unless there was a good reason for it.

[RustyTheGeek]

EMI/RFI Shielding has little to do with permeability that is being discussed.  I worked in a lab a long time ago that used simple screen mesh (like on a screen door) for shielding an entire small room.  It was well GROUNDED.  And only a specific range of frequencies were being attenuated.  (You can only minimize the signal to a lower level, you don't actually block it entirely.)  You can even shield (attenuate or minimize) with a thin coating of special paint or foil tape.  It all depends on the frequency range and power levels in question.  Radio frequency engineering is a complex subject.  You see simple shielding all the time.  Inside your laptop or cell phone.  Inside your microwave oven door.  The grounded door mesh completes a simple Faraday Cage and along with the metal box, it shields you from the microwaves inside.  It works well because it is engineered for those specific frequencies and the fixed orientation of the radio wave emission.

Bottom Line is that if an EMI/RFI Engineer wants to use plastic instead of metal regardless of permeability, I'm not going to question the design because I want to assume they did a little testing and determined that to be the best solution.  Even if a metal enclosure passes the signal, the effective range will likely still be better with a non metal enclosure.

[simonxu11]

Love the ironies...

And its so ironic, too...we bitch about having AA filters....they bitch about NOT having them. We bitch about having too many fps...they bitch about none of their cameras competing with the 7D line.

Ah, the ironies. SO MANY IRONIES!

in terms of price, FPS, the 7100 seems more on-par with an x0D than a 7d. Especially if it's a pentamirror VF instead of a pentaprism... which as neuro pointed out, is more xx0 than x0. Higher MP, sure, but that's what Nikon's all about, isn't it? I feel like this doesn't put that much pressure on an upcoming 7d2

How come it's pentamirror,it says pentaprism on Nikon official website
http://www.nikon.com.au/en_AU/product_details.page?DCRPath=templatedata/en_AU/saleable_product_information/data/Digital%20SLR%20Cameras/D7100.xml&currentProductTab=3&CategoryID=gp11zkm9

So you guys believe the future X0D will have 100% VF, two SD slots, similar AF from flagship model, 1080i 60??

[neuroanatomist]

How come it's pentamirror,it says pentaprism on Nikon official website

Thanks, that makes more sense (and is why I questioned the person who posted that it was a pentamirror).

[Don Haines]

The body is made of magnesium.

Air has a permeability of 1.000 000 37
Magnesium has a permiability of 1.000 12
Steel and iron are around 100
Mu-Metal, used for electromagnet shielding, is around 20,000 to 50,000

Think of permeability as the materials ability to react to (attenuate) radio signals.

In other words, the magnesium body is  for all practical purposes, transparent to electromagnetic waves (radio)..... and even if it wasn't, there are dozens of holes through the metal shell.

It has been a long time sense I took electrodynamics courses in collage but this just did not sound right.  This is true for the magnetic quality but magnesium is still conductive.  Air is not.   In fact aluminum is used for EMI shielding all the time and it has a permeability of 1.000021.  This is greatly dependent on frequency at 2.4 Ghz the penetration of electromagnetic waves or skin depth of magnesium is only around 5.7 micro-meter.  I would say that you will need a RF window for any wireless to work.  I imagine that 800 Mhz  would just go right through it. But we are talking wireless so that is 2.4 Ghz or higher.   Just because something is not magnetic does not mean that it is a poor at EMI shielding.

 

If you do not want to take my word for it I found a like to a company that makes magnesium alloy casting touting EMI shielding as one of the advantages.  It is named Wellcharter.  The site will not let me post the link here.

This kinda rings true with me: I don't think Canon would have used a plastic top plate on a $2000 camera unless there was a good reason for it.

My mistake! I was thinking magnetic shielding...

Pure magnesium is a relativly poor blocker of RF, but some of the alloys are quite good... and the Canon bodies are a magnesium alloy....

Once again... OOPS!!!

[AvTvM]

D7100 in the mix: -- let's take a quick first look -- the ...--100% pentamirror viewfinder...

Are you sure about that?  Pentamirrors are cheaper (which is why they're used in the Rebel/xxxD line) and dimmer than the preferable pentaprisms.

Of course its a Pentaprism Viewfinder ... as in the predecessors of their upper-,iod-level DSLRs .. all the way back to the D70/D80/D90/D7000.

Source
http://www.dpreview.com/previews/nikon-d7100/2
and also Nikon themselves: http://www.nikon.de/de_DE/product/digital-cameras/slr/consumer/d7100
just got the Nikon germany link quickly

As per Nikon Germany spec sheets, the D7100 VF appears to be unchanged from the D7000:
* Pentaprism
* Coverage 100 % (vertical and horizontal)
* Magnification approx. 0,94x (50mm-lens at f/1.4, focus infinite and –1,0 dpt
* eye point 19,5 mm @ –1,0 dpt
* Dioptre adapt -3 to +1 dpt

btw:  try to find such detailed product information on European Canon websites .. good luck!

[gecko]

Hope it has a 'direct print' button.

[aznable]

in terms of price, FPS, the 7100 seems more on-par with an x0D than a 7d. Especially if it's a pentamirror VF instead of a pentaprism... which as neuro pointed out, is more xx0 than x0. Higher MP, sure, but that's what Nikon's all about, isn't it? I feel like this doesn't put that much pressure on an upcoming 7d2

of course it is...it costs 1100€

the real question is...the 70D will ba able to compete with this, feature wise or it will be another overpriced camera like 60D?

[aznable]

Hope it has a 'direct print' button.

canon.it

MIRINO

Tipo
Pentaspecchio

Copertura (verticale/orizzontale)
Circa 95%

Ingrandimento
Circa 0,80x¹

Campo visivo
Circa 21mm (from eyepiece lens center)

Correzione diottrie
Da -2,5 a +0,5 m-1 (diottrie)

Schermo di messa a fuoco
Fisso

Specchio
Metà specchio a ritorno rapido (trasmissione: rapporto di riflesso 40:60, no cut-off specchio con EF 600 mm f/4 o inf.)

Informazioni sul mirino
Informazioni AF: punti AF, luce conferma messa a fuoco
Informazioni esposizione: velocità otturatore, valore apertura, sensibilità ISO (sempre visualizzata), blocco AE, livello/compensazione esposizione, cerchio lettura spot, avviso esposizione, AEB
Informazioni flash: flash pronto, sinc. alta velocità, blocco FE, compensazione esposizione flash, luce riduzione occhi rossi
Informazioni sull'immagine: priorità toni chiari (D+), scatto monocromatico, velocità di scatto massima (indicazione a 1 cifra), correzione del bilanciamento del bianco, informazioni sulla scheda SD

Anteprima profondità di campo
Sì, assegnata al pulsante SET mediante la funzione C.Fn-8-5

Otturatore oculare
Su cinghia

per i moderatori:
ma questa specie di troll molesto non è ancora stato bandito da questo forum?

[bseitz234]

per i moderatori:
ma questa specie di troll molesto non è ancora stato bandito da questo forum?

c'è un moderatore che parla italiano?


New thought: AF-point linked spot metering. I was just rereading TDP's 1dx review, because I like to taunt myself like that. And I realized that's listed under "1dx advantages over 5d3". Any chance of the 7d2 getting this? I guess it comes back to giving a lower-numbered camera features that the higher-numbered, more expensive camera doesn't have, vs. pro-level / enthusiast level in the two separate lines (FF and APS-C). But for something so small, I can't help but think AF-point-linked spot metering would be really helpful for the kind of shooting people use these cameras for...

[Marsu42]

New thought: AF-point linked spot metering. I was just rereading TDP's 1dx review, because I like to taunt myself like that. And I realized that's listed under "1dx advantages over 5d3". Any chance of the 7d2 getting this?

I somehow doubt it because the reason why the 1dx has it and the 5d3 hasn't is the different metering system - so for the 7d2 with supposedly a more complex af system as the 7d Canon would also have to add another completely new metering system. Of course they could if they wanted to, but one the one hand it'd drive up the costs for sure.

[bseitz234]

New thought: AF-point linked spot metering. I was just rereading TDP's 1dx review, because I like to taunt myself like that. And I realized that's listed under "1dx advantages over 5d3". Any chance of the 7d2 getting this?

I somehow doubt it because the reason why the 1dx has it and the 5d3 hasn't is the different metering system - so for the 7d2 with supposedly a more complex af system as the 7d Canon would also have to add another completely new metering system. Of course they could if they wanted to, but one the one hand it'd drive up the costs for sure.

Ah. Fair point. I assumed dedicated processor for AF, forgot the 1dx had one for AE. Too many letters...

oh well, I'll keep dreaming.

[aznable]

per i moderatori:
ma questa specie di troll molesto non è ancora stato bandito da questo forum?

c'è un moderatore che parla italiano?

of course not, but i wanted to use just italian for the entire message

[Bosman]

I know i am kinda late to the party but I keep trying to buy a 7D but keep stopping myself...The current 7D just doesn't out do my 1D Mark III so i guess i can't justify the regular 7D until I have gotten an upgrade. Why why why does this have to come out in the fall. I'd buy it right now like i bought the 5DM3 last March. Oh God I'd be so happy if they released it 2 weeks from now. Heres to unrealistic hope.

[Etienne]

I know i am kinda late to the party but I keep trying to buy a 7D but keep stopping myself...The current 7D just doesn't out do my 1D Mark III so i guess i can't justify the regular 7D until I have gotten an upgrade. Why why why does this have to come out in the fall. I'd buy it right now like i bought the 5DM3 last March. Oh God I'd be so happy if they released it 2 weeks from now. Heres to unrealistic hope.

Great quote comes to mind: "The best time to buy a new digital camera is when it's NEW."

I wouldn't buy a 60D, T4i, or 7D today. They will all be replaced soon.
Wait or buy a 6D, 5DIII, 1Dx etc.