I'm going to Mexico City for a few days with my dad in one week. I'm going to shoot slide film and b/w because I prefer the look, I like the archival quality, and I don't want my digital stolen. I will be bringing my Pentax Spotmatic, Pentax ME-F, a tripod, my M42 Super Takumar 50/1.4, my SMC Pentax M 50/1.7, my SMC Pentax M 200/3.5, and I may get an M42 Super Takumar 35/3.5 or 28/3.5. I will bring a warming filter for shooting in shade with the slide film, but most of what I'm going to shoot will be out in bright sunlight. Namely, architectural shots in Mexico City, the Pyramids, the Volcanoes. I will do street stuff, but that will mostly be b/w. So anyway... from what I've heard, Kodachrome 64 is close to unmatched in accurate color reproduction and high natural contrast. I've heard it is the most archival film you can buy, so long as it's kept in the dark. I'm really interested in shooting Kodachrome 64 on my Mexico trip, and I think it would be awesome to see what shots in 1964 would look like, as that's the year my Spotmatic is from, and I'm sure Kodachrome was popular then. I've heard Velvia 100F lacks the vibrant reds of Velvia 50, and I have seen it produce orange instead of red in some flower shots I took at the botanical gardens. I'm worried about red reproduction in Mexican landscapes. My questions are really, if I send Kodachrome 64 directly to Dwayne's, how long should it take? And, if I'm used to shooting Velvia/Provia, would Provia provide similar accuracy in color reproduction? Because obviously, Provia is much more convenient to get developed than Kodachrome. How about Astia? Should I hold on the Kodachrome until after my Mexico trip, in case my inexperience with the emulsion leads to improperly exposed film?