hflare Loc: Florida

I own a Nikon D80 body....

I have a sigma 28 mm 70 mm DG 2.8

Is this a digital lens?

I want to buy a ultra wide angle lens. I found a

Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Nikon Digital SLR Cameras

which is in my price range... and I only want to take outdoors photographs so the 4.6 is alright for me)

My question is: Is the mm size on both of these lens from a digital measure or is one of the old MM sizes with film camera.

I mean if I look at the 10-20 mm on the potential new lens
am I looking at the same numbers as the 28-70 mm lens?

I was told earlier that when I look at a digital mm I must multiply that MM 2.5 times the actual number on the lens.

for example if I had a 20 mm digital lens, the mm would really be 45 mm in the film lens. (I only understand the film mm's)

Sorry I am getting old......

I guess the simplest way for some of you to help me is to tell me whether this new 12 mm would be actually twice as small as the 28 mm on my other lens....

Thank you if you can figure this out enough to give me some help... I have saved my money for one year and I have enough and I am ready to order.. I live in a very remote area and there is not any camera shops near by. I do not want to spend my money to have to return the item....

Monte

rpavich Loc: West Virginia

When you see lens sizes they are always in reference to what they are with no crop factor math. i.e. 10mm is 10mm.





No. the 10mm with a crop factor of 1.5 (which is what your D80 has) makes the lens' field of view equal to 15mm. the 28mm with the same crop factor makes the field of view equal to 42mm.




Not correct. Your D80 has a multipler of 1.5.




See previous answer. You have the idea but the crop factor seems excessive.




The ratio is the same for each as I said in the first answer.




You have a D80 so the crop factor is 1.5.

The 10mm-20mm is like a 15mm-30mm on your camera.


The 28mm-70mm is like a 42mm-105mm.

bioteacher Loc: Brooklyn, NY

hflare Loc: Florida

I have a Nikon D80 digital camera

rpavich Loc: West Virginia

I edited my answer once I realized you had a D80.

See my updated answers.

There is no such things as a "digital lens" that takes in to consideration your crop factor and marks the lens accordingly.

The lens' are what they are....your crop factor is 1.5.

hflare Loc: Florida

I do not have the gift for writing what I feel....

I have the 28-70 lens.. which is great for my general photographing.. but I have always been so fascinated
with photographs which were taken with these extreme wide angle lens but not to the fish eye perspective..

I am looking for a off brand lens, Sigma etc.. which might give me a door into that wonderful focal lengths with the least cost too me.

I want a lens which in the film cameras would be like 13 mm to 18mm ... it can be a zoom lens or one focal length like a 15 mm as the film camera view would be..

I found this 12-24 Sigma on sale at a price I could afford now.

How ever I can wait and do some more odd jobs, I am retired but can get work at the ranch I live at for some extra income.

I do not have any camera place here to go and try out the lens.

So, is the Sigma 12-24 mm digital lens one which will give me that 15mm look? without that fish eye look... warped!

Or should I wait, save my money and go for some other more expensive lens?

I own a Nikon D-80

Thank you .....

rpavich Loc: West Virginia

[quote=hflare]

No.

The 12mm-24mm with your 1.5 crop factor gives you an apparent focal length of 18mm-36mm.

It might seem that 15 and 18 are very close but they will appear different.

To get an apparent 15mm "look" on your camera you need a 10mm lens.

The Sigma that you mentioned in your first post would do it and it's a great lens..I had one.

MT Shooter Loc: Montana

Sigma differentiates their lenses via "DG" meaning Digital Grande (Full Frame), and "DC" meaning Digital Crop. DC is equivalent to DX in Nikon speak.
28mm is 28mm no matter which "format" it is used on.

Bigdaver

Digital lenses refer to antireflection coatings on the rear element of the lens. Where film didn't reflect, digital sensors do and cause loss of contrast possibly if the rear element isn't coated.

snowbear

To get the look of 15mm you will need 10mm. You probably will not see that much difference between the photos taken with a 10mm non-fisheye lens and the 12-24mm lens.

If you can take a couple of test shots before you buy the Sigma, do so and see if you like the outcome before you buy it.

Nikonian72 Loc: Chico CA

This diagram may help you understand about "crop factor". All lenses project the same field-of-view on every camera. The difference is the size of each camera's sensor.

"Full frame" (FX) digital cameras have sensors the same size as 35-mm film ratio used in film cameras: 24-mm x 36-mm.

"Cropped" (DX) digital cameras have smaller sensors (approx 16-mm x 24-mm) which see & record a smaller area of the image projected by the lens. This is generically called an APS-C size sensor.

On Nikon DX cameras, we use a crop factor of 1.5x to figure the apparent view, which would match the lens needed on a 35-mm film camera to capture the same field-of-view.

Sensors - FX vs DX Field Comparison

hflare Loc: Florida

Gentlemen... and may a Lady.. not sure with those Avatars...

Maybe it would be easier for you to say and for me to understand..

I have the 28 mm Sigma DG zoom lens..

I love the softer quality it gives in my photos....

without understanding.. which I admit I stepped out on the wrong foot... my apologies, as I am not very keen in math..

I want to go as wide as I can in a lens, focal lengh fixed or in a zoom lens. I have a saved amount of money now, but I can save up some more... but I do have a limit of how long I might want to wait...

What lens would you all suggest for me to look at?

I do not want to get into that fisheye effect...

I see these wonderful landscapes, with subjects in the front of the lens just as sharp as the objects to the rear of the photo.. and it just calls to me to see what I can do.....

I hope that you can forgive me for taking you to New York from Texas to L.A....





Thank you so much for your time and efforts of so far..
and I certainly appreciate your inputs.. and I do intend to attempt to comprehend those subjects most of you gave to me in order to understand the lens..

ward5311 Loc: Georgia

OK...I'll ask...can you share your budget with us?

ward5311 Loc: Georgia

OK..Looks like you are talking about $500. My advice would be to save $200 more and buy this lens:
http://www.kenrockwell.com/tokina/11-16mm.htm

hflare Loc: Florida

Yes, I can go another month, have some saved, Tuesday will make it four hundred in the pocket, next month four weeks from then, another four, I took a job painting a fence, starting this week end, and can add a few hundred more as I am waiting for next month... so, I can afford this lens..

I like the spec's.. I just spent a hour reading the reports on the lens you suggested, it seems to have most of the others beat and that includes the Nikon one also...

And such a fast one.. 2.8 aperture.. for the smallest setting...

Thank you I am very delighted with this lens, and will be looking to obtain it next month.. if you have any other views or lens to have me look at, considering my budget.. let me know...

I will now go and see if I can find some photos taken with the lens.. and check them out...

Thanks dude..!!!