Sigma 30mm f/1.4 DC A (Art) AF Lens for Pentax APS-C DSLR {62}

Sigma's proven 30mm f/1.4 Art prime for Pentax APS-C shooters

On an APS-C sensor, 30mm lands at roughly a 45mm equivalent field of view, close enough to the classic "normal" perspective that your eye reads images as natural, but with enough working distance to stay out of your subject's space. The f/1.4 maximum aperture is the real draw here. It gives you a full stop over f/2 glass, which matters in low-light venues where ISO is already working hard, and it produces enough subject separation at close focus distances to make backgrounds read as distinctly out of focus without resorting to telephoto compression.

The 8-blade diaphragm shapes the out-of-focus rendering, and the HSM ultrasonic motor drives autofocus quietly with full-time manual override, grab the ring and adjust without flipping any switches. At 430g and 59mm long, the lens sits well-balanced on mid-size Pentax bodies without front-heavy handling. The 62mm filter thread is a practical size with no shortage of options. Seven elements in seven groups is a tight optical formula for a fast prime, and Sigma's Art designation reflects the optical standard this design was built to meet.

Who It's For

Street and documentary photographers working Pentax bodies will find the normal-equivalent field of view and f/1.4 aperture a natural pairing for available-light work in bars, markets, or evening events where slower glass just doesn't cut it. Portrait shooters on a tight budget get meaningful subject separation at f/1.4 without moving to a longer focal length. Event photographers shooting in dim reception halls benefit from the HSM motor's quiet operation and the ability to fine-tune focus manually mid-sequence. Student photographers building a Pentax kit get a fast, optically serious prime as a foundation lens.

Key Features

• 30mm prime with f/1.4 maximum aperture for APS-C format
• HSM ultrasonic autofocus motor with full-time manual override
• 8-blade diaphragm for controlled out-of-focus rendering
• 7 elements in 7 groups optical design
• Pentax KAF mount with 62mm filter thread
• 430g weight, 59mm length for compact build
• 0.40m minimum focus distance

FAQ

What field of view does the 30mm focal length give on Pentax APS-C?

On APS-C, 30mm yields roughly a 45mm equivalent field of view - close to the classic normal perspective. You get enough working distance for portraiture without feeling compressed, and your eye reads the framing as natural.

How does the f/1.4 aperture perform in low light?

f/1.4 gives a full stop over f/2 glass, which matters when ISO is already working hard in venues like dimly lit interiors. It also provides enough subject separation at close focus distances to render backgrounds distinctly out of focus.

Does the autofocus have manual override?

Yes. The HSM ultrasonic motor supports full-time manual focus override. Grab the focus ring and adjust without flipping any switches or disengaging autofocus.

What's the minimum focus distance?

0.40 m (15.75 inches). Close enough for detailed work, though not a macro lens.

Is this lens weather sealed?

No. The Sigma 30mm f/1.4 DC Art has no weather sealing. Keep it dry in wet conditions.

What filter size does it take?

62mm. Standard thread size with no shortage of filter options available.

Does it balance well on mid-size Pentax bodies?

Yes. At 430g and 59mm long, the lens maintains balanced handling on mid-size Pentax APS-C bodies without front-heavy weight distribution.