[Aavso-photometry] What to use when there are no suitable comparison stars in the field?

[Terry Bohlsen]

Dear All
I have been taking mostly images of long period variables and these have all had a nice selection of suiatable comparison stars. 
I thought I would like to try to take some time series of stars suggested in the AVSON southern CCD target lists. One from 24/7/08 suggested AS Ind, SZ Ind and AR Ind. They are all in the same CCD filed for my setup. I have taken a short series but the problem is a lack of comparison stars with photometry data. There is one star in the field TYC 8794-1530-1 with a tycho V mag of 9.589 but this is pretty bright compared to the variables. With a 60 sec exposure it half fills the dynamic range of my CCD but the variables are still a bit dim with a S/N giving errors of ~0.1 mag. It would be better to double the exposure but this will make the tyco star not usable.
There are lots of other stars in the field (see chart 1013bh) but I have only got GSC or USNO-a2 mags for them that are pretty unreliable.
I'm not up to measuring the mags using all sky photometry so what are the choices?
I can just do differential mags but this seems to be not as good as producing non transformed mags.
I could measure one of the mag ~13 stars in the field using the tycho star and then use that measurement as the comparison star on longer exposures but I assume this will potentially add more error.
Any suggestions or do I not bother with this field?

Thanks in advance

Terry Bohlsen
Armidale NSW