Contax RTS repair & common faults
Excellent coverageThe Contax RTS was the first camera to carry the Contax name after Zeiss, Yashica and Porsche Design joined forces, launched in the mid 1970s as a professional 35mm SLR built around Zeiss T* optics. It is an electronically governed camera through and through: aperture-priority metering, an electronically timed shutter and a release built for minimum lag, rather than the mechanical, spring-and-lever bodies of the decade before. Most faults that come in are age related, drifted electronics and perished foams, rather than anything that failed from hard use.
Aperture-priority auto exposure with manual override · Electronically governed vertical metal focal-plane shutter · CdS TTL metering · Battery-dependent electronics throughout · Contax/Yashica (C/Y) bayonet mount
Common Contax RTS faults
Contax RTS shutter won't fire
This is an entirely electronic release, so a dead shutter usually points to the electronics rather than a jammed mechanism, whether that is corroded battery contacts, a weak cell or a release relay grown sticky with age. If the meter needle also fails to move, the fault sits somewhere wider in the circuit rather than just the release path. A fresh battery is worth trying before assuming the worst.
Contax RTS meter needle erratic or jumps around
The RTS meters through a CdS cell, and those cells drift and lose sensitivity with age, so a needle that wanders, lags or gives inconsistent readings between shots is often just the cell reaching the end of its accurate life. It can equally be a corroded contact inside the metering circuit rather than the cell itself, the two look identical from the finder and need testing to tell apart.
Contax RTS mirror is noisy or slow to return
A loud slap or a mirror that hangs before dropping back down is almost always the damper foam inside the mirror box, which perishes to a sticky residue after decades and stops cushioning the swing. Old grease on the pivots can add a slow, dragging return on top of that. This is a mechanical damping fault rather than an electronic one, and common at this age.
Contax RTS shutter speeds inaccurate or slow
Because the shutter is timed electronically rather than mechanically, its accuracy depends on the timing circuit and capacitors staying within range, and both drift with age, usually showing up as slower speeds running long. A shutter that sounds uneven or where the blades visibly drag points at old lubrication on the mechanism rather than the electronics. A weak battery can mimic this and is worth ruling out first.
Contax RTS light leaks or foam turned to goo
The foam light seals around the back door and hinge perish with age on cameras of this generation, and the RTS is no exception, turning into a sticky residue that stops blocking light and often smears onto the film chamber. It shows up as streaks or fogging along the edges of frames, usually worst near the hinge, and is one of the most common faults on a camera this old.
Stuck on your Contax RTS?
Describe the fault or drop in a photo. The technician reads the service data, marks up what it sees, and walks you through it. Pay as you go, no subscription.
Try it now ›Scatto is a reference tool for people who service film cameras. It explains mechanisms and quotes service data, but it cannot see your camera at the bench, so verify anything load-bearing before you act on it.