I sent a letter and autograph request to duck dynasty with no sase or pic. and got a 11 x 8.5 picture of the cast signed. took about 2 months. used addy in database.

You dont have to if you send to an agency they should have pics but its good to be safe and send one or if you have a specific pic you want signed. Adam sandler sends you a pp dont know about duck dynasty.

Ive found the exact opposite in my 15+ years of collecting, in my personal experience the vast magority of celebrities dont require a photo to so sign, in order to send you an autograph, unless its at a venue, or movie set etc.. However i always try to include an index card in my letter, so if they wont sign without you sending something, then they can sign the index card. However well fewer than 10% of my successes have returned just the index card signed, and its usually much older-era stars too that have been receiving letters for 25+years. However it is nice to include a pic if you have or can get one.

If I send a letter, SASE, and no photo to be signed, but just request an autograph photo, etc.., is there a chance that I will get it or do I have to send a photo ?????

What about Duck Dynasty or Adam Sandler with this question above ?????