DSLRUsers.com

Posted: **Mon Aug 21, 2006 11:08 pm**

Just looking at these leses and contemplating and I notice the DC an DG tags. Does anyone know the difference? There appears to be very little difference between these three lenses (below) but the prices vary.

Any help appreciated.

Rob

http://www.centre.net.au/Sigma_AF_18_50 ... 007XC.html
http://www.centre.net.au/Sigma_AF_24_60 ... 007XC.html
http://www.centre.net.au/Sigma_AF_28_70 ... 007XC.html

Posted: **Mon Aug 21, 2006 11:18 pm**

DC = digital
DG = 35mm and digital
EX = Superior build and optical quality

Posted: **Tue Aug 22, 2006 12:06 am**

you can also get DF EX lenses ...
i think they were the ones before the DG came out

Sigma AF 28-70mm f2.8 EX Aspherical DF Lens for...........

http://shop.centre.net.au/index.html?ca ... it=product

Posted: **Tue Aug 22, 2006 12:18 am**

From Sigma's website:

EX (EX Lens)
The exterior of this lens is EX-finished to denote the superior build and optical quality, and to enhance its appearance.

DG (DG Lens)
These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs.

DC (DC Lens)
These are special lenses designed so that the image circle matches the smaller size of the image sensor of most digital SLR cameras. Their specialized design gives these lenses the ideal properties for digital cameras, the compact and lightweight construction is an added bonus ! including compact and lightweight construction.

The DG lenses typically have anti-reflective coatings on the rear elements to reduce possible reflections from the sensor (shinier than film). Other manufacturers such as Canon use similar coatings in some lenses, but don't bother making it part of the model name.

Obviously DC lenses can't be used on "full-frame" cameras.

Posted: **Tue Aug 22, 2006 12:18 am**

as i understand it DC lenses can't be used on cameras with a full frame sensor or film. DG refers to a special type of coating that is supposed to be offer better performance on digital cameras.

Posted: **Tue Aug 22, 2006 1:29 am**

if your contemplatign 3 sigma primes

save your money and get the Sigma AF 28-70mm f2.8 EX Aspherical DF Lens
that covers the range and save up for a dedicated canon equivallent prime like the 85mm f1.2

Posted: **Tue Aug 22, 2006 8:56 am**

wendellt wrote:save your money and get the Sigma AF 28-70mm f2.8 EX Aspherical DF Lens

What is a DF lense then?

Is it comparable to this?
http://www.centre.net.au/Sigma_AF_28_70 ... 007XC.html

Posted: **Tue Aug 22, 2006 1:06 pm**

wendellt wrote:save your money and get the Sigma AF 28-70mm f2.8 EX Aspherical DF Lens
that covers the range and save up for a dedicated canon equivallent prime like the 85mm f1.2

How will the Sigma 28-70/2.8 be compared to the Nikon 28-70/2.8? Performance in wide open, colour/contrast and bokeh wise?

DSLRUsers.com

Difference between Sigma EX DC and DG lenses?

Difference between Sigma EX DC and DG lenses?