> Why, then, don't we see the same penalty in 80-200/2.8 zooms or 100-300/4s?
You do see the penalty. The F/FA 80-210 f4.7-5.6 uses a 49 mm. filter. So does the older F70-210 f4-5.6. If these were constant f2.8 lenses, the front element and filter would be enormous. Joe - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
