shimming 101

[sanmich]

Well, since you'll be testing the shims, we should know soon right?

Once you get the close focus issue fixed, just shoot the moon for practical purposes, and if it shows up aligned in RF, lens is racked to inf. or on inf. mark, and image of moon at say 100% crop is tack sharp, then all is well.

I'm just not seeing how moving an optical cell assembly inside a threaded fixed rotation barrel can let close focus be adjusted away, while infinity distance of element remains constant, with just shimming, and not adjusting some stops or threads.

But let's just wait for the results, if the moon stays good and sharp now, and after at 3.5 or wide open, after you fix the close focus, then it seems all good.

Good idea, but how do you shoot the moon?
I mean what exposure do you use for it?

 

[ampguy]

with film, tripod and cable release would be good

with film, tripod and cable release would be good

With the M8, I just use 1.4 or 1.5 and line it up in the RF with AE -1.3 EV so maybe bracket 1/4, 1/8, 1/15 with some good 800 or 1600 film @ 3.5

Good idea, but how do you shoot the moon?
I mean what exposure do you use for it?