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OM-1 vs OM SYSTEM PEN

The OM SYSTEM PEN is 9 mm narrower, 17.1 mm shorter, 29.4 mm thinner and 206 g lighter than the OM-1. The OM SYSTEM PEN takes up 55 % less space (the box around the body, without lens).

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OM-1

Width × height × depth: 134.8 × 91.6 × 72.7 mm (5.31 × 3.61 × 2.86 in)
Weight: 599 g (21.1 oz)
Mount: Micro Four Thirds
Price: no recent price

B&H Photo ↗Amazon ↗Adorama ↗

All about the OM-1 →

OM SYSTEM PEN

Width × height × depth: 125.8 × 74.5 × 43.3 mm (4.95 × 2.93 × 1.70 in)
Weight: 393 g (13.9 oz)
Mount: Micro Four Thirds
Price: $1,000 at Adorama

B&H Photo ↗Amazon ↗Adorama ↗

All about the PEN →

Specifications compared

	OM-1	PEN
Sensor	Four Thirds (17.4 x 13.0 mm) stacked BSI Live MOS	Four Thirds
Resolution	20.4 MP	20.4 MP
Stabilization	5-axis in-body, up to 8 EV steps	Sensor-Shift
ISO	200–102400 (default auto 200–25600; LOW approx. 80)	Base: 100*
Burst	120 fps electronic (S-AF, blackout-free), 50 fps C-AF	Up to 30 fps
Video	4K 60p 10-bit 4:2:0; Full HD 240p	4K internal
Autofocus	1,053-point cross-type phase detection AF, contrast AF (1,053 points)	121-point cross-type hybrid AF, human/pet detection
Viewfinder	OLED EVF, 5.76M dots, approx. 1.48x–1.65x, 100% coverage	Electronic (OLED) · 2,360,000 Dot · 1.1x
Screen	76 mm (3.0") vari-angle touch, approx. 1.62M dots	Articulating 3" Touchscreen LCD
Card slots	2x SD UHS-II	Single Slot: SD/SDHC/SDXC (UHS-I)
Battery	BLX-1 rechargeable (included)	BLS-7
Shutter speed	–	1/4000–60 s
Dimensions	–	125.8 x 74.5 x 43.3 mm
Weight	–	393 g with battery & card