Originally posted by WPRESTO Excuse on the basis of an aging film shooter who can only think of 28-35-50-55.
Or an RF photographer like me who mostly thinks of FL in regards to rangefinder framelines. 28~50 35~75 90~135
Originally posted by Fenwoodian The dynamic range of the Sigma is impressive.
Dynamic range is not an optical property. The contrast range represented in an image is a result of accurate exposure and the inherent contrast range the sensor is able to record.
Originally posted by Fenwoodian highlights that the Sigma handled nicely were totally blown out with the Pentax 20mm lens.
This indicates the sigma lens was transmitting less light than the prime lens was. Lower T. Stop, this is not a favorable property.