Paul wrote:

but bracketing is limited to +-3EV

No Paul, it's ±2EV
as most Canon camera's, but there is a solution:
http://www.youtube.com/hdriblog
http://promotesystems.com/products/Promote-Control.html
300$ :-(

I doubt there will be more details at a 7D with a sig 8 than a 450D
I can hardly see differences between the 400D and 450D with this lens and a 7D won't help
Go for a 5D2 for just 2-300 Eu more or go for a second hand 5D (7-900 Eu) + Tokina or Sig 15.
grtz
Frank

I handled a Canon 7D for about one minute today.  The larger eyepiece and viewer along with the increased number of focus points is a fabulous improvement.  I saw another person using the leveling feature.

The light meter displays +/- 3 EV  ( manual page 38)
The exposure bias may be set up to +/- 5 EV, but only +/- 3 EV will be displayed  ( manual page 104 )
The auto exposure bracketing may be separated by +/- 3 EV in 3 exposure brackets ( manual page 105 )
( too bad they did not increase the number of exposure brackets.  Who cares about more separation.  I want more brackets )

I am skeptical about the noise and dynamic range when Canon crams 17.9 megapixels on a APS-C sized sensor.  The camera probably has the improved coverage microlenses, improved light transmission infrared filter, better photodiode design, and better signal processing algorithms from the 5D mark II technology.  If you use a medium sized RAW at 10 megapixels instead of a large 17.9 megapixel RAW it probably will not improve the signal to noise ratio or the dynamic range.  The photodiodes will be smaller due to the greater number of pixels and additional data paths needed to transfer captured charge information off of the chip.  A photodiode that is smaller has less capacity for charge and is more susceptible to noise. ( If the same photodiode design is used )  Earlier Canon image sensors had added preamplifier's for each photodiode before analog to digital conversion which helped with different DC offsets at different photodiodes.

** 1. http://www.imaging-resource.com/PRODS/E7D/E7DA.HTM
2. http://www.devicemag.com/2009/09/01/can … led-today/
3. http://www.dpreview.com/previews/canoneos7d/

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Je me suis occupé un Canon 7D pour environ une minute aujourd'hui. L'oculaire de plus en spectateur avec le nombre accru de points de focalisation est une amélioration fabuleux. J'ai vu une autre personne en utilisant la fonction de nivellement.

Le compteur affiche light + / - 3 IL (page de manuel de 38)
Le biais d'exposition mai être mis en place à + / - 5 EV, mais seulement + / - 3 IL sera affiché (page de manuel de 104)
Le bracketing de l'exposition automatique mai être séparés par + / - 3 IL en 3 tranches d'exposition (page de manuel de 105)
(Dommage qu'ils n'ont pas augmenté le nombre de tranches d'exposition. Qui se soucie de la séparation sur plus. Je veux parenthèse)

Je suis sceptique au sujet du bruit et une gamme dynamique où Canon bourre 17,9 mégapixels sur un format APS-C de capteurs. L'appareil a probablement le microlentilles amélioration de la couverture, la transmission améliorée filtrent la lumière infrarouge, une meilleure conception photodiode, et de meilleure qualité des algorithmes de traitement du signal de la technologie 5D Mark II. Si vous utilisez un RAW de taille moyenne à 10 millions de pixels au lieu d'un grand RAW 17,9 mégapixels il ne sera probablement pas à améliorer le rapport signal sur bruit ou de la gamme dynamique. Les photodiodes sera moindre en raison du nombre plus élevé de pixels et d'autres chemins de données nécessaires pour transférer les informations saisies charge hors de la puce. Une photodiode qui est plus petit a moins de capacité de charge et est plus sensible au bruit. Préamplificateur (Si la conception même photodiode est utilisé) Au début de capteurs d'image Canon avait ajouté pour chaque photodiode avant la conversion analogique-numérique qui a contribué avec des décalages différents DC à photodiodes différentes.

** 1. http://www.imaging-resource.com/PRODS/E7D/E7DA.HTM
2. http://www.devicemag.com/2009/09/01/can … led-today/
3. http://www.dpreview.com/previews/canoneos7d/

Last edited by Castillonis (2009-10-01 02:05:38)

GURL wrote:

...Possibly, a 58% rendering (rather than 100%) would compensate for the tiny pixels noise...

I remember some time ago, probably before v2.0, some test made by DrSlony showing that reduction before rendering was not as accurate than rendering at 100% then resize under image editor. Alexandre said to have improved APP but can't get the best. That's why I try to render first at 100% then resize when needed.
I guess I should test again now APP accuracy with downsized rendering.

Im impressed with the quality of the 7d its near on par with the 5d. But when you consider the 7d is faster at 8fps and printable quality at iso 6400 its a good thing. the video modes are more flexible to than the 5dmkii. Its also about 700 quid cheaper the 7d. The full frame is nice. But between a full frame cam print and a cropped sensor its neither here or there. I use a Olmec op1000 printer and the difference cannot be seen unless its pixel peeping time. At true 600 ppi max resolution on a 9x6 the real advantage of the 7d for me is the 8fps. Rather get the shot than miss it on a slower camera.
But its all down to the type of photography I guess.

Model photography 5d mkii. Super large prints 5dmkii. True Ultra Wide photos.
Not as fast for writing to mem cards

Fast, sports, zoom, wildlife and a4 to a3 prints the 7d.
Faster than 5dmkii for writing to mem cards

Also if you already have a cropped sensor and a few Eps, APS-C lenses its saves on that part to.

The 100-400mm L lens I use should work wonders with the extra 8 million pixels I can still crop and print with decent res and effectively increase the zoom to an equiv 1100mm lens (with the 1.4x extender) about 1500mm. Sweet! The extra iso is also a huge benefit to this type of lens in lower light conditions.

Turns and roundabouts really.

Last edited by jamma-pcb (2009-11-20 01:38:04)

my collegue is currently reporting an "overheating alert" if the canon 7d is used for HD filming outside with 28-35 degrees outside temperature...
its alerting but filming is not interupted...
Georg