maximum available apeture of zooms at variable focal lengths of zooms

**aslyfox** · 10-23-2017, 07:14 AM

I have found a review which purports to show the aperture at certain focal lengths of the hd pentax da 16 -85 mm f 3.5 - 5.6:

" The maximum available aperture changes with the focal length as shown in the diagram below, which also compares the 18-85mm to other lenses, including the faster Sigma 17-70mm "Contemporary": "

Read more at: HD Pentax-DA 16-85mm F3.5-5.6 Review - Construction and Handling | PentaxForums.com Reviews

does anyone know of a similar chart showing the aperture at certain focal lengths of other zooms such as the HD Pentax-D FA 150-450mm F4.5-5.6 ED DC AW

thanks for helping me out.

D1N0 · 10-23-2017, 07:35 AM

From the PF review: F4.5 is available until 300mm, at which point F5.6 becomes the widest selectable aperture. Similarly, past 300mm F27 is the minimum aperture, up from F22.

**aslyfox** · 10-23-2017, 07:44 AM

Originally posted by D1N0

From the PF review: F4.5 is available until 300mm, at which point F5.6 becomes the widest selectable aperture. Similarly, past 300mm F27 is the minimum aperture, up from F22.

thanks, I was looking in the wrong spots

looking for a similar chart but there is no need for one

10-23-2017, 07:14 AM	#1
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,581	maximum available apeture of zooms at variable focal lengths of zooms I have found a review which purports to show the aperture at certain focal lengths of the hd pentax da 16 -85 mm f 3.5 - 5.6: " The maximum available aperture changes with the focal length as shown in the diagram below, which also compares the 18-85mm to other lenses, including the faster Sigma 17-70mm "Contemporary": " Read more at: HD Pentax-DA 16-85mm F3.5-5.6 Review - Construction and Handling \| PentaxForums.com Reviews does anyone know of a similar chart showing the aperture at certain focal lengths of other zooms such as the HD Pentax-D FA 150-450mm F4.5-5.6 ED DC AW thanks for helping me out.

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10-23-2017, 07:35 AM	#2
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	From the PF review: F4.5 is available until 300mm, at which point F5.6 becomes the widest selectable aperture. Similarly, past 300mm F27 is the minimum aperture, up from F22.

10-23-2017, 07:44 AM	#3
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,581 Original Poster	Originally posted by D1N0 From the PF review: F4.5 is available until 300mm, at which point F5.6 becomes the widest selectable aperture. Similarly, past 300mm F27 is the minimum aperture, up from F22. thanks, I was looking in the wrong spots looking for a similar chart but there is no need for one