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Nikon F4s vs F90x |
| Feature | F90X | F4s |
| Matrix metering segments | 8 | 5 |
| 3D matrix metering (with D lenses that give distance) | yes | no |
| Matrix and center-weighted meter EV range | -1 : 21 | 0 : 21 |
| Spot meter EV range | 3 : 21 | 2 : 21 |
| Mercury switch that detects horizontal or vertical camera position used to change matrix metering from horizontal to vertical pattern | no | yes |
| Matrix metering works with AI lenses | no | yes |
| Center-weighted metering pattern | 75/25 | 60/40 |
| 5 segment TTL off the film "matrix-like" flash meter | yes | no |
| Center-weighted TTL off the film flash meter | no | yes |
| Autofocus module | AMD246 | AMD200 |
| Number of pixels in autofocus CCD | 246 | 200 |
| Cross-type autofocus (can autofocus on objects with either horizontal or vertical details) | yes | no |
| Horizontal autofocus module (has trouble with objects that only have vertical details) | no | yes |
| Wide area autofocus option (in addition to spot AF) | yes | no |
| Autofocus speed | faster | fast |
| Focus tracking - max frames per second | 4.1 | 3.4 |
| FP High-speed flash sync (1/250 to 1/4000) | yes | no |
| Slow flash sync (below 1/60) | yes | no |
| Red-eye reduction | yes | no |
| 3D multi-sensor balanced fill flash (SB-25 or SB-26) | yes | no |
| Monitor pre-flash (part of prior feature) | yes | no |
| With SB-26, flash failure gives read out of exposure error (like you were 2/3 ev under exposed) | yes | no |
| Flash bracketing (with databack/link) | yes | no |
| Minimum manually settable shutter speed | 30 seconds | 4 secs |
| Exposure compensation range | +5 ev | +2 ev |
| Can mount old F (non-AI) lenses (stopped down metering) | no | yes |
| Mirror lock-up | no | yes |
| Make AF lock button lock exposure and AF both databack/link | yes | on body |
| 250 exposure back option | no | yes |
| Replaceable finder | no | yes |
| 6X full-frame high-magnification finder option | no | yes |
| Waist-level finder option | no | yes |
| Action finder option (arm's-length finder) | no | yes |
| Optional back to leave leader out at end of rewind | no | yes |
| Multiple exposure databack/link | yes | on body |
| DX decoded ISO film speed displayed? | yes | no |
| Highest continuous frames per second (all systems "go") | 4.3 | 5.7 |
| Continuous "silent" mode (CS) about 1 frame per second | no | yes |
| Lithium batteries usable (official Nikon position) | yes | not mentioned |
| Rechargeable nicad cartridge battery option (MB-23 with MN-20 and dedicated charger) | no | yes |
| Number of optional replaceable focusing screens | 2 | 12 |
| Built-in diopter correction in finder ( to -3) | no | yes |
| Program-hi exposure mode | no | yes |
| Flexible program (allows you to control f-stop to shutter speed relationship within programmed modes) | yes | no |
| Vari-program (7 variations on "programmed AE" mode) | yes | no |
| Computer interface (to Sharp Wizard) | yes | no |
| Databack (MF-23 and MF-24) can print date/time, shutter speed, aperture and exposure compensation values ***between*** frames (other databacks can print various information, but only on your picture) | no | yes |
| Manual rewind (as an alternative to power rewind) | no | yes |
| Variable self-timer | yes | no |
| Two-shot self-timer | no | no |
| Vertical shutter release | optional (MB-10) yes | on body (MB-21) |
| Viewfinder coverage | 92% | 100% |
| Shutter duty cycle | 50,000 | 200,000 |
| Rubber-armored | no | yes |
| Weight (gram) | 755 | 1279 |