我想了解NIKON F90与F90X的区别，望各位DX指教。

当年 SB-26：gray market $310， USA $380-$400。
SB-26 二手的现在得在 $300 左右好象。

现在 SB-28 USA 的才 $310 左右，gray $270。

冬绒兄，

SB-26 上的没有无线 TTL 功能，只有无线触发闪光。
不要以讹传讹。

SB-28 的便宜，主要原因还就是偷工减料。

哈哈，fotobug 悲痛欲绝！

90 和 90X 的区别俺曾经细列过，Cut&Paste 如下：

Autofocus faster, which are the result of: 1) shorter mirror
  movement time; 2) shorter shutter charge time; 3) coreless
  motor makes film advance faster; 4) AF CPU now twice as fast;
  5) 25% faster lens drive; 6) newer AF algorithm (rumored to be
  a bug-fix of that in N90)
Autofocus tracking speed of 4.1 fps instead of 3.6 fps
Shutter speed changes in S and M modes are in 1/3 stop instead
  of full stop increments.
Weather resistance added
Redeye-reduction indicator on camera body's LCD panel
Vertical grip (MB-10) provides secondary shutter release
Can use lithium AA batteries in the body
Beeping functions need to be activated via software instead
  of a switch. Thus the power switch becomes on-off two-position
  switch instead of off-on-beep three- position one
Few more options for customizing the camera setting (via
  software) such as "easy compensation" for
Aperture-Priority Auto exposure mode, showing metering deviation
  between matrix and center-weighted meters
Has significantly larger data storage capacity: 33 rolls of
  shooting data instead of 2 rolls.
Stripped off the "two-shot self-timer" feature.

吐冬狨：

多灯联闪的TTL闪光控制功能跟机身基本上没有关系。什么机器
都可以联上多个灯（当然得配适当接座、线）实现有线的TTL闪
光控制。新出的SU-4实现无线的TTL闪光控制。

MS-11 用在* MB-10 手柄上。当然也可以用在 F90 上。

补充一点：
F90X还取消了F90的蜂鸣声响提示。

F90的快门是1/2档步进，F90X（S）是1/3档，
另外，F90不能用锂电池。