A broad APS-C zoom with optical stabilization and a variable maximum aperture; distortion correction is automatic.
- Connection
- Direct mount
- What was checked
- Direct-mount stills in APS-C capture, with only the explicitly named RAW or movie-mode exceptions. Online manufacturer documentation; no hands-on test.
- Sources checked
The next source check for this pair is overdue. Next source check due .
Sensor coverage & crop
LimitedThis APS-C lens gives 27–202.5 mm full-frame-equivalent framing in cropped capture.
- a7 IV APS-C capture; still-image size limits follow the linked crop rule.
Autofocus
SupportedSet both camera and lens to AF; the lens minimum focusing distance is 0.45 m from the sensor plane.
- Direct mount; stills in AF-S or AF-C. The minimum is not measured from the front element.
Manual focus
SupportedManual focus works with either camera or lens set to MF. Temporary AF from a camera AF/MF control requires the lens switch to remain at AF.
- Use the focus ring for MF; the temporary-AF case specifically uses camera MF and lens AF.
Stabilization
SupportedThe lens has optical SteadyShot; its parts list has no SteadyShot switch, so stills stabilization is controlled from the camera.
- Stills; SteadyShot On in the body menu. No combined lens/body effectiveness rating inferred.
Lens corrections
LimitedDistortion compensation is fixed to Auto for this exact combination.
- Direct mount; this does not establish how an external RAW processor applies corrections.
Aperture control
LimitedMaximum aperture changes from F3.5 to F5.6 across this zoom’s range.
- Native 18–135 mm optical zoom; F3.5 is not available at the long end.
Not covered by the sources
- The reviewed exact-pair page gives no numeric minimum firmware for ordinary lens operation. Null firmware fields mean unspecified versions, not universal all-version support.
- Maximum burst rate, sustained subject-tracking performance and combined stabilization effectiveness for this exact pair were not verified.
- The reviewed crop rule covers JPEG/HEIF stills. Uncompressed/compressed RAW output details and a complete video-format matrix remain outside its scope.
- Lens manuals warn that focus switches or hold buttons may differ by camera; the exact a7 IV page lists no such exception, but every custom-button assignment was not separately verified.
Sources and review notes
Firmware in scope: camera not stated, lens not stated, adapter not stated. “Not stated” means the documents do not give a version range. It does not mean every version works.
Researched 2026-09-07 by an AI research agent reading the documents below, then source-checked 2026-09-07. Nobody has tested this pair by hand. How the research works
- ILCE-7M4 + SEL18135 — Compatibility Information — Exact body/lens result and restriction bullets. Opened through direct HTTPS after web fetch failed. APS-C framing is listed. Distortion compensation is set to Auto. Accessed 2026-09-07.
- E 18-135mm F3.5-5.6 OSS — Specifications — Lens Specifications. Exact lens identity, E-mount, APS-C format, equivalent field of view, aperture, focus distance and stabilization specification. Accessed 2026-09-07.
- ILCE-7M4 Help Guide — APS-C S35 Shooting — Menu item details and Note. On/Auto permit APS-C lenses; Off remains selectable for stills but can darken edges. 4K60p/50p locks On. No firmware minimum stated. Accessed 2026-09-07.
- ILCE-7M4 Help Guide — JPEG Image Size/HEIF Image Size — 3:2 table; Hint; Note. APS-C cannot select L; L temporarily becomes M. M is 14M, 4608×3072 for 3:2. Does not establish every RAW format. Accessed 2026-09-07.
- E 18-135mm F3.5-5.6 OSS — Operating Instructions — 4-698-437-02(1); PDF page 1, English Parts, Focusing and Specifications. AF/MF switch, temporary AF/MF button conditions, 0.45 m minimum focus from sensor, OSS; no SteadyShot switch in the identified parts. Accessed 2026-09-07.
- ILCE-7M4 Help Guide — Selecting the focus method — Menu item details; Note. Body AF-S/AF-C, DMF and MF operation; only AF-C and MF in Movie/S&Q. AF-A has its own phase-detection prerequisite and is not asserted in these packets. Accessed 2026-09-07.
- ILCE-7M4 Help Guide — SteadyShot (still image) — Menu item details; Note. Camera menu turns stabilization on/off unless the lens has a SteadyShot switch; that switch then controls the setting. Accessed 2026-09-07.
- ILCE-7M4 Help Guide — Specifications — System; Image sensor; SteadyShot. Exact body is full-frame E-mount with sensor-shift stabilization. No combined lens/body stop rating inferred. Accessed 2026-09-07.
- ILCE-7M4 Help Guide — Lens Compensation — Distortion Comp.; Note. Some compatible lenses lock distortion correction to Auto. Exact pair pages, rather than this general warning alone, identify four such lenses here. Accessed 2026-09-07.
Related rules: a7 IV stills with these five APS-C lenses →