Have to say I am having trouble posting and getting this error:
vBulletin Message
Your submission could not be processed because a security token was missing.
If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error.
DC-3 Dreams Communication Center
I any case, will try to read as you suggested. I am a bit skeptical that I will get better focusing with an offset than using the actual filter.