Lots of different cameras to choice from and many are great and many are over priced too. I currently use a Wildview IR model I bought earlier this year. I was a bit worried at the quality/craftsmanship/look and the price was only $89 on clearance at Mills Fleet Farm. I have used it all spring, summer, fall, and now in the winter and have not been displeased at all! It has been a work horse all year and has never given me any trouble. Its a bit slow at times depending on how the deer are moving but it takes crisp pics most of the time. I used a set of batteries in it of like 3 weeks and it worked great and then I bought the 12 volt StealthCam battery kit from Walmart.com for like $30-35 bucks deliveried site to store for pickup (way cheaper that way, but does take longer) and that has been the best purchase ever! I took over 900 pictures the first time before I had to recharge the battery. I just got 1040 pictures in like 8 days on a turnip foodplot and the battery was still kick'n! The camera and battery have been will worth it and the camera is fool proof to use. In fact I have been so impressed this year I bought another Wildview IR ($80 at Dick's) for "my" Christmas present and cant wait to open it and get it out in the woods.
I not 100% sure on the flash/IR issue....I do know from personal experience that I have used 35mm flash cams in the past and unless I was putting out some "treats" by the cam the mature bucks (3-4 year old deer) would never come back for a second picture. My hunting buddy uses 2 Leafy River flash and 1 StealthCam flash and I dont remember ever seeing a mature buck hit a scrape more than once this season after the flash went off.
I am not ashamed of the gospel, because it is the power of God for the salvation of everyone who believes: first for the Jew, then for the Gentile. Romans 1:16