Dont think so. Taken with my 300mm, 1.4 converter.
Nice shots, the fly is good stuff.
You need a macro lens if you want to get inside, the Pictures you send are considered close ups, but not macro.
The difference is for instans a dandilion, while you get a great closeup shot with the 300 + conv you wil not be able to get a decend shot if you pill the flower apart and do a single seedpod, maybe I should try to insert a picture
Dandylion_edited-1.jpg by Nicolaas C M, on Flickr
Single seedpod floating on Water
So its realy up to you, a macro lens is not as versetile as you combo, but the results can be different.