Question 1

What camera bodies is the Mamiya-Sekor C 90mm f/3.8 compatible with?

Accepted Answer

The Mamiya-Sekor C lens series is built for the Mamiya 645 system. That includes bodies like the Mamiya M645 and Mamiya 645 Pro. The 'C' designation is part of Mamiya's lens naming for the 645 system — if you're unsure whether your specific 645 body is compatible, it's worth cross-checking with your body's manual or a Mamiya 645 community resource.

Question 2

What is the equivalent focal length of the 90mm on a medium format 645 camera?

Accepted Answer

On a 645 medium format frame, a 90mm lens gives you an angle of view roughly equivalent to about 55–56mm on a 35mm full-frame camera. That puts it right in 'normal-to-short-telephoto' territory — great for candid portraits and environmental shots without heavy background compression.

Question 3

Is f/3.8 fast enough for portrait and wedding photography on film?

Accepted Answer

For most portrait and wedding scenarios, yes. Medium format film itself tends to produce beautiful subject separation thanks to the larger negative, so f/3.8 gives you pleasantly soft backgrounds even without an ultra-wide aperture. In low light you'll want fast film (ISO 400 or pushed), but in natural daylight or with flash, f/3.8 is a very workable maximum aperture.

Question 4

How does the 90mm focal length work for street photography?

Accepted Answer

On 645 medium format, 90mm works well for street photography if you like a bit of distance between you and your subject — it lets you frame a single person or small scene without getting too close. It's more of a 'quiet observer' focal length than a wide-angle street lens, which suits a deliberate, film-based shooting style well.

Question 5

Is buying a used Mamiya-Sekor C 90mm f/3.8 worth it?

Accepted Answer

Absolutely — Mamiya-Sekor C glass is known for its solid build quality and consistent optical performance, and second-hand copies are widely available in good condition. Since this is a fully manual lens with no electronic components, there's very little to go wrong. That said, do check the aperture blades for oil and the shutter (if present) for smooth operation when inspecting a copy. Every used lens on Camera-tweedehands.nl comes with a minimum 12 months warranty, so you're covered.

Question 6

Can the Mamiya-Sekor C 90mm f/3.8 be used on digital cameras?

Accepted Answer

Technically yes, with a Mamiya 645 to another mount adapter — for example, adapting to a digital medium format body or even a mirrorless full-frame camera. Keep in mind that on a 35mm sensor, only the central portion of the image circle is used, so you lose the medium format rendering. The lens really shines when used as intended on a 645 film body.

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Mamiya-Sekor C 90mm f/3.8

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