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7D vs 5D2???

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EOBeav:

--- Quote from: neuroanatomist on November 20, 2012, 04:00:14 PM ---Thus, the main difference is that with the 7D you have 18 MP, and with the 5DII you have 8 MP.
--- End quote ---

Help me out here, neuro. My 5DmkII has way more than 8MP...it's 21.1.  What do you mean by 8MP?

n/m, I see what you're doing. However, I usually don't crop my photos like that. If I need to zoom in, I either get closer to my subject or increase my focal length. Or both.

Marsu42:

--- Quote from: DCM1024 on November 20, 2012, 04:16:35 PM ---I found my 7D to be one stop better for ISO than the T2

--- End quote ---

... um, but, but, they have the same sensor?! And looking at sample shots the 7d is probably worse because it has higher banding due to the dual readout channels.


--- Quote from: EOBeav on November 20, 2012, 04:17:15 PM ---
--- Quote from: neuroanatomist on November 20, 2012, 04:00:14 PM ---Thus, the main difference is that with the 7D you have 18 MP, and with the 5DII you have 8 MP.
--- End quote ---
Help me out here, neuro. My 5DmkII has way more than 8MP...it's 21.1.  What do you mean by 8MP?

--- End quote ---

Let me interpret what our good Dr. Neuro is trying to say, it was a rather large textblock which tends to confuse people :-p ... if you crop back the 21mp shot to match the 1.6x crop factor, then there are 8mp left - if that's all you need you're ok with ff over crop because the iq is similar in this case (sharpness vs iso noise). I hope I've got it right :-p

neuroanatomist:

--- Quote from: EOBeav on November 20, 2012, 04:17:15 PM ---
--- Quote from: neuroanatomist on November 20, 2012, 04:00:14 PM ---Thus, the main difference is that with the 7D you have 18 MP, and with the 5DII you have 8 MP.
--- End quote ---
Help me out here, neuro. My 5DmkII has way more than 8MP...it's 21.1.  What do you mean by 8MP?

--- End quote ---

The 7D is a 'crop sensor' - that means it samples only a small portion of the FF image circle.  That's the basis of the 'reach' argument for APS-C (red is FF, blue is APS-C):



If you crop the 5DII image down to the field of view of the 7D (e.g. crop the red image to the blue image, above), you'd be left with 8 MP of your original 21 MP. 

neuroanatomist:

--- Quote from: EOBeav on November 20, 2012, 04:17:15 PM ---n/m, I see what you're doing. However, I usually don't crop my photos like that. If I need to zoom in, I either get closer to my subject or increase my focal length. Or both.

--- End quote ---

Right.  But what if you're already shooting with a 100-400mm lens at 400mm, and if you walk any closer to the bird or wild critter, it will fly/run away?  You could do what I did - get a 600mm lens to use on your FF camera.  But buying a $13,000 lens to get a longer focal length is not a realistic option for everyone.  400mm is a pretty hard limit if you like autofocus, with the forthcoming exception of 560mm/600mm on the 5DIII (400mm f/5.6 with a 1.4x TC or 300mm f/4 with a 2x TC).. and even that exception is a lot more $ than the OP is talking about, from what I can tell, since the 5DIII was not on the table for discussion.

gmrza:

--- Quote from: Marsu42 on November 20, 2012, 03:44:08 PM ---
--- Quote from: houston1852 on November 20, 2012, 03:29:20 PM ---I'm sure this has been covered a dozen times before

--- End quote ---

Indeed ... but I can understand that these decisions are not easy so asking again is tempting :->

Except for absolutely stellar tele primes extenders are for occasional use and not for "always on" because they heavily depend on the iq of the base lens - the 100-400L isn't a promising choice for this and it'll be f8 which has af problems (I can tell, I've got the 70-300L which is sharper). That's why most budget wildlife shooters who want tracking and fast fps are on the 7d - the alternative is about $5000-$10000 more.

Upgrading from the 550d->7d with the same sensor also doesn't seem that smart to me unless you get a very good deal ... better wait for the 7d2 or 70d with probably a better sensor that'll solve your problem.

Btw: You should get a Kenko 1.4x anyway for even on crop, it's very nice on the macro :-)

--- End quote ---

I agree with the view to avoid buying another crop frame camera, if you already have one of the bodies which has an 18MP sensor.  All the indications are that Canon's crop sensors are due for a refresh next year, so if you want to stay on crop, it may be better to hold out for one of the new bodies coming out next year.

Apart from hopefully having a better sensor, the replacement for the 7D would have better integration with some of Canon's latest accessories, like the Speedlite 600-EX-RT - for instance, only bodies of 2012 vintage or later integrate 100% with the use of the colour-correction gels supplied with the 600-EX-RT.  The 7D also requires a USB cable connection to integrate with a GPS receiver. - If any of these features mean anything to you, it may be another reason to wait.

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