Performance evaluation of the Chrosziel CDM-100 follow focus motor

المعدات

Zephyrهل أستطيع تشغيل Alexa أو RED على Zephyr؟389

Master Seriesهل يستحق جهاز Master Series مستعمل الشراء كأول جهاز كبير؟191

BFDكيف أشغّل مستقبل BFD من الكاميرا أو من الـ sled؟186

Voltهل أستطيع تركيب Volt على الـ sled أو الـ gimbal الحاليين عندي؟168

Artemisكيف أشغّل الكاميرا والإكسسوارات من sled Artemis؟166

MDRأين أركّب Preston MDR على الـ rig؟143

Modulusهل يوجد خيار HD لاسلكي من Modulus؟141

G-70هل تركّب الـ G-70 على الـ vest أو الـ gimbal أو الـ sled عندي؟126

FI+Zهل أستطيع التحكم في iris وzoom لاسلكياً وليس focus فقط؟60

HU3أين أصلح الـ HU3 أو أجدّده أو أعيد طلاءه؟60

CineLiveكيف أعبّئ جهاز CineLive وأشحنه بحقائب مناسبة للنقل؟54

G-70Xكيف يقارن الـ G-70X بـ Pro Titan وXarm وبقية الأذرع؟46

Trinity 2هل firmware الإصدار SUP 3.0 لـ Trinity 2 آمن أم فيه أعطال؟46

Ultra Vestأي vest أختار حسب مقاسي وراحتي ونوع عملي كمشغّل؟39

2015منتدى Follow Focus

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The CDM-100 motor is extremely compact and lightweight, making it suitable for setups where size and weight are critical constraints.
Performance varies depending on which gear configuration is installed—the smaller of two available gear sizes produces significantly faster operation.
Speed performance is comparable to established motors like Betz and Heden models when properly configured, achieving similar response times on standard cinema lenses.
Torque output is reduced compared to heavier-duty motors, which limits its suitability for lenses with high resistance or demanding focus pulls.
The motor operates quietly during normal use.
At the $900 price point, the motor offers practical value for backup applications, iris control, or budget-constrained productions.
Some users experienced minor chattering noise when used with Preston MDR focus control systems, though the cause was unclear.
Real-world performance on actual productions has been satisfactory for moderate workloads, though it has not been extensively tested under demanding conditions.
The motor functions as an effective iris motor regardless of its focus application performance.

Testing was conducted on specific lenses including an Angenieux 24-290 and a Canon lens, which may have different drag characteristics than other cinema lenses.
Limited field experience exists—most observations come from controlled tests and light commercial work rather than extended production use.
Chattering behavior with Preston MDR systems remains unexplained and potentially unresolved.
Gear configuration significantly affects performance, and users must verify which gear is installed for consistent results.
The reduced torque makes it unsuitable for demanding focus pulling tasks or high-resistance optics.