08-07-2010, 12:46 PM
[quote name='geriatric' timestamp='1281163284' post='1563']
Surely a lens maker does not differ between crop and full frame. As I mentioned earlier regarding the Tamron 28-75mm lens. The specs are identical and the description only mentions DI. I am confused about this.
[/quote]
APS-C lenses just have to have a less wide image circle, making them potentially lighter, and cheaper to make.
Full frame lenses can be used on both ASP-C and full frame lenses.
Canon calls their APS-C lenses EF-S, full frame lenses are called EF (electro-focus). The S stands for Short, the distance between sensor and lens can be a bit shorter for their APS-C lenses.
Lens brands and their APS-C naming conventions:
Brand : full frame / APS-C
Canon : EF / EF-S
Tamron : Di / Di II
Sigma : DG / DC
Tokina : - / DX
Nikon : - / DX
Sony : - / DT
Pentax : A big mess.
Surely a lens maker does not differ between crop and full frame. As I mentioned earlier regarding the Tamron 28-75mm lens. The specs are identical and the description only mentions DI. I am confused about this.
[/quote]
APS-C lenses just have to have a less wide image circle, making them potentially lighter, and cheaper to make.
Full frame lenses can be used on both ASP-C and full frame lenses.
Canon calls their APS-C lenses EF-S, full frame lenses are called EF (electro-focus). The S stands for Short, the distance between sensor and lens can be a bit shorter for their APS-C lenses.
Lens brands and their APS-C naming conventions:
Brand : full frame / APS-C
Canon : EF / EF-S
Tamron : Di / Di II
Sigma : DG / DC
Tokina : - / DX
Nikon : - / DX
Sony : - / DT
Pentax : A big mess.