You need to specify the lens speed you want. Most zooms come in 2 speed classes.
Since M42 original era zooms are both rare and mediocre generally, consider researching what has been made in Tamron Adaptall 2 as you can get both generic M42 and ESII M42 adapters for Tamron Adaptall 2 lenses. That said, here is my "lightweight" M42 lens package. 24mm 3.5 SMC Takumar PRIME 28-85 F4 RMC Tokina (exceptionally good) 80-200 F2.8 Tamron Adaptall 2 (fantastic but large) 300 mm SMC Takumar PRIME The two zooms cover most of the shots. I often use 2 bodies so I don't need to switch lenses. JCO -----Original Message----- From: Sid Barras [mailto:[EMAIL PROTECTED] Sent: Thursday, July 01, 2004 3:49 PM To: Pentax discussion Pentax discussion list Subject: What's the best zoom(s) for M42? HI All, Well, I'm getting less and less inclined to lug around the entire SMC tak prime lens collection these days... So, I'm wondering, to all the screwmount afficanados, I ask the question: The best (available, anyway-- I intend to seek and buy the lens) zoom lenses for M42. My requirements would be two or three good quality zoom lenses in screw mount to cover the 28 (or 24 if I'm really fortunate) to 300 or so zoom lenses. It wouldn't have to be one of those 28-300 mega zooms like the tamron K mount I've got. It could be two three or four even lenses that together would cover that range. Infrared markings would be nice too. Greetings from CajunLand USA South Louisiana Sid Barras
