Originally posted by barondla Have you tried the Pentax 1.4X Rear Converter with the 120 or 90 macro? It fits the 120, not sure about the 90. Do you find the 90 handles stopping down past f14 better than the 120?
Do you prefer the Irix 150 over the Sigma 180 for image quality, or other reasons?
Thanks,
barondla
no, never tried the teleconverter... if they invent one that doesn't degrade image quality, i'll be all over it. past f14 they're both suffering but i think the 90 is better at f10-14... plus it's great at 2.8, and wr. the 90 really reminds me of the da*300 on ff... doesn't really do anything wrong. the image stablization on the 90 is good.
the irix is shorter (if you need to use a flash/diffuser, lens doesn't block the light as much if the subject is close), weather sealed, handles ca better, faster, cheaper, more flare resistant, readily available, and better at f10 on. the sigma is no slouch though, and sometimes i think it produces more vibrant greens. if you're pointed towards the sun, even with the hood, the sigma can lose contrast.