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Compare specifications and GLM's editorial notes. Check the source documentation for the exact lens version, then send both families with your project details.

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ARRI / Spherical Prime

ARRI Signature Prime

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IronGlass / Spherical Prime

IronGlass Soviet MKII

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Original illustrations of representative lenses, with simplified details and no shared scale. The overview, use cases and tradeoffs are editorial selection guidance. Test the exact lenses on your camera before committing to a package.

ARRI Signature Prime and IronGlass Soviet MKII: specifications and editorial notes
SpecificationARRI Signature PrimeIronGlass Soviet MKII
OverviewLarge-format LPL primes with a broad focal range. ARRI describes their rendering as warm on skin, with soft bokeh and delicate flares.Rehoused Soviet optics that include the Helios 44-2 58mm. IronGlass preserves distinct donor-lens rendering while adding cine housings and matched 95mm fronts.
Lens typeSpherical PrimeSpherical Prime
Focal range12mm-280mm20–135mm in the six-lens reference set
Max. apertureT1.8-T2.8T2.1–T3.6 in the reference set
Coverage

Super 35 / Full Frame

ARRI specifies coverage up to a 46mm image circle. The 200mm is T2.5 and the 280mm is T2.8; other bare primes are T1.8. Check the chosen sensor mode.

Super 35 / Full Frame

Full Frame in the six-lens reference set. Larger coverage varies by donor lens and sensor mode.

MountsLPLPL
Image circle46 mmNot established
Introduced2018Not established
Use cases
  • Large-format narrative features
  • Premium commercial work
  • Controlled focus-pulling environments
  • Character-led vintage lens packages
  • Close portraiture with Helios or Jupiter rendering
Tradeoffs to test
  • Heavier than classic S35 prime sets
  • Less innate texture than vintage families
  • Aperture and rendering differ among the donor lenses.
  • Custom MKII options extend beyond the six-lens reference package.
Sources
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GLM can use this profile as a starting point for lens strategy, sourcing, or adjacent package recommendations.

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GLM can use this profile as a starting point for lens strategy, sourcing, or adjacent package recommendations.

Coverage can change with focal length, rear optics and sensor mode. Inventory links describe the mapped GLM package; confirm the exact set, price and shoot dates with GLM.

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