This or the sony 35mm oss? w/c is better?

This is notably larger. Also consider the Sony FE28 f2, also a sharp lens. On APS-C it has T stop of 2, sigma has t-stop of 1.8 on this f1.4 lens. The Sony FE28 lens fits the app-c body's better than sigma lens. I went with the sigma though but I'm not sure I would a second time, due to size.

How does this compare to the Sigma 30mm f/2.8? Are there different purposes for each? I am looking for the sharpest focus throughout the photo.

I have the 30mm f2.8 and this 1.4 and I don't notice much difference under normal conditions. Maybe other more extreme conditions this f1.4 would be better

Is this a full frame lens?

This lens is designed for the aps-c sensor, that's a crop sensor format.

hola le queda a una sony A7III

Si, es la misma montura, asegúrate que cuando lo coloques activar el modo apsc, si bien le hace no es tan recomendable porque se te va a recortar la imagen ya que el lente es de apsc

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Description

📸 Elevate your mirrorless game with pro-level sharpness and buttery bokeh!

WHISPER QUIET AUTOFOCUS - Stepping motor delivers fast, silent AF ideal for both photos and cinematic videos.
STUNNING F 1 4 BRIGHTNESS - Capture ultra-sharp images with dreamy bokeh that rivals premium Art lenses.
COMPACT LIGHTWEIGHT DESIGN - Perfectly balanced for mirrorless APS-C cameras, ensuring effortless portability all day.
ADVANCED OPTICS WITH ASPHERICAL ELEMENTS - Minimizes distortion and chromatic aberration for edge-to-edge clarity.
DURABLE THERMALLY STABLE COMPOSITE BUILD - Precision-engineered for long-lasting performance and smooth aperture control.

The Sigma 30mm f/1.4 DC DN is a compact, lightweight prime lens designed for APS-C mirrorless cameras. Featuring a bright f/1.4 aperture, advanced aspherical optics, and a quiet stepping motor autofocus, it delivers exceptional image quality with beautiful bokeh and fast, smooth focusing. Engineered with durable Thermally Stable Composite materials, this lens offers professional-grade performance in a portable form factor, making it a must-have for creative professionals and enthusiasts alike.

Specifications

Package Dimensions L x W x H	13.7 x 10.7 x 10.5 centimetres
Package Weight	0.44 Kilograms
Product Dimensions L x W x H	7.4 x 6.6 x 6.6 centimetres
Item Weight	265 g
Brand	Sigma
Camera Lens	SIGMA 30mm f/1.4 DC DN Contemporary Lens for Sony Mirrorless Cameras and APS-C format e-mount The lens is made in Brazil and features a maximum aperture of f/1.4, high-quality optical design with aspherical and high-refractive index elements, and a stepping AF motor for smooth, near-silent autofocus.
Colour	Black
Country of Origin	Japan
Has image stabilisation	No
Included components	lens and lens hood
Lens Fixed Focal Length	30 Millimetres
Max Focal Length	30 Millimetres
Min Focal Length	1 Millimetres
Model year	2016
Plug profile	Sony E
Objective Lens Diameter	64.8 Millimetres
Part number	302965
Size	52 mm
Zoom Type	fixed
Lens Design	Prime
Maximum Aperture Range	8
Focus type	Autofocus
Style	SONY E
Photo Filter Thread Size	52 Millimetres
Guaranteed software updates until	unknown

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