That's pretty brutal advice telling a landscape photographer not to use a red or orange filter! But compared to conventional films, I have noticed some very strange things with the T-Grain films with regard to filters. In comparing Delta 100 with TMX in Colorado (lots of blue light up here), TMX is more than 1 stop slower than Delta 100 with an orange (O2) filter. Even without any filters, TMAX is about 1 stop slower than Delta 100 up here. I have tested with Rodinal and XTOL. I am not sure I mind the "weird" color renditions, but getting accurate exposures is pretty difficult.(posted 8355 days ago)