TTL loupes is speical lighter weighter desinging. and it is closer to eyes, offering more wide field of views. TTL loupes is custom made loupes, don't need adjustable when using. and the cost is higher than the Flip Up Style. our Portable LED headlight can be mounted on the Normal TTL loupes, our portable LED Headlight also is lighter desinging. mounting the LED headlight on the TTL loupes, the total weight is no less than 50g.