This was done on a d100 with older sigma 70-210 2.8 lens w/ $100 quantaray 2x converter.. somewhat equal in focal length to a 630mm lens and even at that I needed to crop in alot.. I want to get a kenko 3x $150 (hoya glass )
that used with my 70-210 would give me 210-630 F8 lens plus 1.5 crop factor
= 315 - 945 F8 )
