Re: Re: Lesson 4 Photography Classes Online – Icon Photography School › Forums › Photography Lessons › Lesson 4 › Lesson 4 › Re: Re: Lesson 4 November 8, 2010 at 2:19 am #19912 Duncan RawlinsonKeymaster Lesson 4 is about filters not lenses. You can buy a filter for $20 used at a camera shop. Do you want to try to get one? Let me know. Also I could probably send you one if you like. What do you think? Email me email@example.com and we can figure it out.