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Tamron - Meaning of Di II and Di
On the Tamron website it says the following:.

Di II Lenses:.

Lenses designed for digital SLR cameras with smaller imagers.

Di Lenses:.

Lenses designed for superior use with digital SLR cameras and conventional cameras..

Does this have any influence on quality of the lens? For example, the 28-75 Di vs the 17-50 Di II. Or what does this actually mean?..

Comments (8)

It means that the Di II lenses are designed to produce an image to fit an APS-C sized sensor as fitted to most DSLRs. If used with a film camera or a full frame sensor camera (like the Canon 5D or 1Ds) the image projected by the lens will not cover the whole of the sensor and there will be severe vignetting at the edges..

The Di lenses produce an image to fit a 35mm film frame or a full frame digital sensor. They can also be used on an APS-C camera although the image will be cropped which affects the effective focal length..

There is no inherent difference in quality between the two. However the Di lens may have less distortion when used on an APS-C DSLR than on a full frame DSLR because distortion typically occurs at the edges of the image which will be cropped off on the APS-C sensor.Chris R..

Comment #1

Thanks, this clarifies a lot. Do other manufacturers apply similar processes to their lenses?..

Comment #2

Yes. Canon call their APS-C size lenses EF-S..

Nikon calls theirs DX..

Sigma calls theirs DC..

It'd be easier to remember if everyone used the same name for it..

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window..

Comment #3

Do I understand this wright:.

If I use a Di II lens for a D80 for example, the crop factor won't play since the lens is made for a smaller image sensor. The focus length will be equal to a Di lens (with the same focus lengths) for a D700..

If I use a Di lens for a D80 I will have to multiply the focus length (10-20mm for example) with the crop factor (1,5 for Nikon). Therefore this lens will actually be narrower (15-30mm) and will loose some of it's wide angel effects..

(http://en.wikipedia.org/wiki/Nikon_DX_format#Implications)..

Comment #4

No, in both cases on the D80 you have to multiply the actual focal length by 1.5 to get the effective focal length..

This applies to both types of lens.Chris R..

Comment #5

Zikje wrote:.

Do I understand this wright:.

If I use a Di II lens for a D80 for example, the crop factor won'tplay since the lens is made for a smaller image sensor. The focuslength will be equal to a Di lens (with the same focus lengths) for aD700..

The focal length of a lens is the same whatever DSLR you put it on - cropped sensor or no cropped sensor. What changes is the field/angle of view which varies with the size of sensor..

For better or for worse people have chosen not to use the angle of view to define a lens but rather commonly express that angle as a 35mm equivalent. So a 50mm lens is described as having 35mm equivalent of 75mm (on a Nikon) or 80mm (on a Canon).

If I use a Di lens for a D80 I will have to multiply the focus length(10-20mm for example) with the crop factor (1,5 for Nikon). Thereforethis lens will actually be narrower (15-30mm) and will loose some ofits wide angel effects..

You will have to multiply by the crop factor whatever lens you put on..

Chris Elliott.

*Nikon* D Eighty + Fifty - Other equipment in Profile.

Http://PlacidoD.Zenfolio.com/..

Comment #6

The focal length of a lens is the same whatever DSLR you put it on -cropped sensor or no cropped sensor. What changes is the field/angleof view which varies with the size of sensor..

This is what I meant to say ..

Next year I'm planning to go to Iceland, and that will mean taking many landscape shots. Seen that I will have to multiply a 10-20mm lens by 1.5, will that still be wide enough for landscapes?..

Comment #7

It should be more than adequate. If you encounter a really broad vista for which 10 mm isn't adequate, take a few overlapping shots (on a level tripod) and use a panoramic stitching program. But a 10 mm lens, even with a 1.5 crop factor (15 mm FF equivalent) should be quite sufficient.Art Caputi..

Comment #8

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