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Message |
    
Norman
Tinkerer
Username: Norman
Post Number: 27
Registered: 03-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 17, 2010 - 05:17 pm: | 
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I have a Fuji GW690 and wish to replace the front lens group. I bought a brand new front lens group that was advertised for the GW690II but as they are both fitted with an EBC Fujinon 90mm f3.5 lens I thought that it might be worth the chance. I tried a rough and ready test by photographing a newspaper at 6ft. The new lens assembly produced a much less sharp image. Could this just be a matter of shimming the lens or have I got the wrong parts? If it is a matter of shimming how best should I proceed? Thanks for any advice. Norman |
Norman
Tinkerer
Username: Norman
Post Number: 28
Registered: 03-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 20, 2010 - 06:34 am: |
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Can anyone help? |
Sevo
Tinkerer
Username: Sevo
Post Number: 61
Registered: 09-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 20, 2010 - 02:41 pm: |
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The optical construction should be the same, but as the II has a integrated sunshade, it might well be that the mechanical construction is different.
To exclude that it is a matter of shimming, you'll simply have to iterate through a series of tests, unscrewing the front lens in 1/8 turns between steps. |
Norman
Tinkerer
Username: Norman
Post Number: 29
Registered: 03-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 20, 2010 - 06:11 pm: |
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The two lens groups are identical externally, my concern is that the optics might differ. Is the spacing between the two lens groups critical? |
