Sigma 30mm f1.4 EX DC HSM

still playing around with my new favorite lens. loving it so far wish i had time to go around and take more photos so i have been limited to messing around the house.

i have manually adjusted mine because it was front focusing just a little but not enough to complain but enough to mess up a headshot if i took one and its set to +8 on my 7D is that a lot? i have no clue if i did it right but the focus is more on now

My Muse

jabrowski wrote in post #12736251

IMAGE LINK: http://www.flickr.com/​photos/jabrowski/58964​60222/
Poutie Face by j_dabrowski, on Flickr

F 1.4 :drool:

What's the distance between you and the subject? I'm going to assume that pic was cropped a good bit.

If I were to take a pic like that and that was the un-cropped image, especially wide open), my 30 would have front focused on the brim of the hat and everything else would be a giant blur. Haha.

FadedBlackSocks wrote in post #12775291
What's the distance between you and the subject? I'm going to assume that pic was cropped a good bit.

If I were to take a pic like that and that was the un-cropped image, especially wide open), my 30 would have front focused on the brim of the hat and everything else would be a giant blur. Haha.

.62m from exif.

eskimochaos wrote in post #12775358
.62m from exif.

Thanks. I don't have a Flickr account nor will my browser's Exif reader find any useful data. Thanks again.

are you using single point AF i dont see why it would front focus that much when you are close to the subject. mine doesnt do that and i have test mine right at the minimal focus distance to see what happens

this photo (posted above) is right at the minimal focus distance and is straight out of camera uncroped

http://farm7.static.fl​ickr.com …45723857_c21b72​7d86_b.jpg

FadedBlackSocks wrote in post #12775391
Thanks. I don't have a Flickr account nor will my browser's Exif reader find any useful data. Thanks again.

Your browser won't find any data if the image is embedded from flickr... and you don't need an account to see EXIF data, if the photographer shares the info, just follow the link to flickr and on the right, click on the camera model...

Brian_R wrote in post #12775632
are you using single point AF i dont see why it would front focus that much when you are close to the subject. mine doesnt do that and i have test mine right at the minimal focus distance to see what happens

this photo (posted above) is right at the minimal focus distance and is straight out of camera uncroped

http://farm7.static.fl​ickr.com …45723857_c21b72​7d86_b.jpg

My 30 is hit or miss. I've been meaning to send it in for calibration but been lazy.

Also, there's a pic I took of a friend at f/1.8 and I was about 3-4ft away from him. I moved the focus point up one and to the right one (on a 7D) to focus on his eye. After importing to the computer, everything was OOF except for the very tip of his nose (no his nose isn't that big either). It practically focused as if I was using the center focus point. The DOF was incredibly shallow thus everything being OOF.

How do you guys take pictures at such close distances wide-open and have the entire subject in focus?

mguffin wrote in post #12775753
Your browser won't find any data if the image is embedded from flickr... and you don't need an account to see EXIF data, if the photographer shares the info, just follow the link to flickr and on the right, click on the camera model...

Heh, thanks. That's really good to know.

On a 7D with a 30mm lens at f/1.4, and a subject distance of 3.5 feet, the DoF amount is .22 feet (2.6"). So, to answer your question, you won't have everything in focus, aim for the eyes, and call the rest art

FadedBlackSocks wrote in post #12776639
How do you guys take pictures at such close distances wide-open and have the entire subject in focus?

shoot at smaller aperture and that will give you a deeper depth of field

i have had my 30 for a week now and although it performs great i dont know if i adjusted perfectly so i dropped it off today at camera repair japan in duluth, GA and hopefully they will calibrate it to my body and get it tack sharp

Time for me to contribute... This one is wide open.

IMAGE LINK: http://www.flickr.com …/14260699@N08/5​952529818/

IMAGE LINK: http://www.flickr.com …/14260699@N08/5​951974841/

IMAGE LINK: http://www.flickr.com …/14260699@N08/5​952532040/

that could possibly be the result of lack of a high contrast area for the camera to actually focus on. its kind of light pointing the camera at a solid color wall and trying to focus on it, the camera will struggle because it is trying to figure out what to focus on

i think that is the problem most of the time. especially in a dark club i would think

Brian_R wrote in post #12777869
shoot at smaller aperture and that will give you a deeper depth of field

i have had my 30 for a week now and although it performs great i dont know if i adjusted perfectly so i dropped it off today at camera repair japan in duluth, GA and hopefully they will calibrate it to my body and get it tack sharp

This I know.

What I'm asking is how do people shoot wide-open and get everything in focus?

mguffin wrote in post #12777824
On a 7D with a 30mm lens at f/1.4, and a subject distance of 3.5 feet, the DoF amount is .22 feet (2.6"). So, to answer your question, you won't have everything in focus, aim for the eyes, and call the rest art

According to www.dofmaster.com, 30mm at f/1.4 on a 7D with a 2.03ft (0.62m) distance yields a 0.07ft (0.84in) DoF.

The subject's face, or any human's face for that matter, is not that shallow. The picture has plenty in focus yet it's supposed to have less than one-third of the DoF of my shot in question.

I pretty much settled for "calling it art" a while ago (haha), but my curiosity is getting the best of me; that's why I ask.

i mean you can stand further away from your subject to get a deeper DOF but you will get less bokeh in the result as well. its the perfect combination of distance and fstop and possible crop of the image as well.

also because you cant see the entire head it doesnt have to been completely in focus as the illusion will be there if enough if in focus. but to get just the entire face from tip of nose to back of ears in focus is not too hard just play around with the factors that go into DOF and ultimately produce different bokeh