Quote:
Originally Posted by pHz  its fine to use the longrod
but
first check the longrod is straight by holding something straight (i use an arrow) against the sight window and checking it thats parallel with the longrod - if it is then using the longrod is OK - if its not then you have to take note of the angle at which your longrod is out by and compensate for that when checking alignment
(IIRC this is the method outlined by simon needham)
slainte  rob |
On the Simon Needham DVD, he also uses a piece of card at the far end of the long rod with horizontal gradations so that when using the long rod in combination with an arrow (see above), you can take note of any deviation from true and align the rest from that mark.
An excellent idea which I couldn't be bothered to do.....the alignment on my riser/long rod was close enough for the level that I was tuning too.