[Frameworks] UV Lens Filters and Lens

[Kevin Timmins]

Hi, I purchased a bundle of Super 8 stuff a while back and wondered if anyone can tell me what the following items are:
First there is a selection of 4 UV lenses. Now I realize that the purpose of these lenses are fairly self explanatory, that is to keep out extra sunlight. I'm wondering however how the grading system works exactly? As you will see from the pictures there is a -0, +1, +2 and another that says S L39.3. The two Nahlinse filters are concave, does this effect the light coming in some how? Are any of these worth keeping or should I sell them off on ebay? If sell then how should I price them?
Secondly there is some kind of Lens, a rather large lens that extends quite a bit when twisted. The lens case says EMC on it and the lens itself twists from infinity to 0.7. Once again is it worth keeping, if I decide to sell it how much should it be priced at etc?
Thanks for any help to comeKevin  		 	   		  
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