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davidsladek · 04-20-2016, 08:44 AM - **1 Like**

Hello, not sure if this has been posted before, but accidentally came across this very handy table of results for Pentax compatible lenses on both ASP-C and FF

Lens Performance Survey - INTERPRETED OUTPUT

Goes to show the different perception some lenses give on the two formats.

stevebrot · 04-20-2016, 09:18 AM

Originally posted by davidsladek

Hello, not sure if this has been posted before, but accidentally came across this very handy table of results for Pentax compatible lenses on both ASP-C and FF

Lens Performance Survey - INTERPRETED OUTPUT

Goes to show the different perception some lenses give on the two formats.

Interesting and all based on user input. It is probably possible to do something similar with the reviews on this site.

Steve

swanlefitte · 04-20-2016, 10:08 AM

They must not post until at least 5 inputs since that was the lowest I saw and a number of lenses are missing like most of mine. Interesting to see.

**dms** · 04-20-2016, 10:56 AM

-- I would suggest adding coma, as a specific item.
-- There should be a way of not using a reviewer(s) ratings if statistically highly questionable. I suggest the lens overall rating be used as the figure of merit--and if outside the average +/- 3 standard deviations it/they not be used.
-- Breaking out (for the same lens) full frame and half frame as two separate lens categories makes a lot of sense.
-- Nevertheless I believe the commentary is still far more important than a set of numbers.

stevebrot · 04-20-2016, 12:21 PM

Originally posted by stevebrot

Interesting and all based on user input

I had to grin when I read about the lenses that I own. Apparently there is a clutch of high distortion, bad flare FA 35/2 out there. Either that or folk are submitting multiple reviews. I also chuckled that some lenses were deemed cool on one format and warm on another (APS-C vs. 35mm FF)

Steve

bxf · 04-20-2016, 04:29 PM

Does make you wonder a bit about the accuracy of some of these numbers when a lens (Tamron 28-75) is shown as having greater vignetting on APS-C than it does on FF

**monochrome** · 04-20-2016, 05:15 PM

Pictures (usually) don't lie.

Lititz · 04-21-2016, 04:55 AM

Originally posted by stevebrot

I had to grin when I read about the lenses that I own. Apparently there is a clutch of high distortion, bad flare FA 35/2 out there. Either that or folk are submitting multiple reviews.

Yes, the FA35 report is quite odd: if I'm reading it right, the report shows more distortion, and more flare, on APS-C than on FF. If (stress on "if") format really can make a difference in such matters, I might have expected any problems to show more readily the other way around, given that more of the glass is in use in FF.

normhead · 04-21-2016, 05:36 AM

All Pentax lenses are slow or very slow focussing. Something is rotten in Denmark.

stevebrot · 04-21-2016, 08:42 AM

Originally posted by normhead

All Pentax lenses are slow or very slow focussing. Something is rotten in Denmark.

...or Deutschland, as may be...

Almost all the non-Pentax lenses too.

Steve

04-20-2016, 08:44 AM - 1 Like	#1
davidsladek Veteran Member Join Date: Sep 2006 Location: Surrey Photos: Gallery \| Albums Posts: 346	Very handy Lens Comparison query on Photozone Hello, not sure if this has been posted before, but accidentally came across this very handy table of results for Pentax compatible lenses on both ASP-C and FF Lens Performance Survey - INTERPRETED OUTPUT Goes to show the different perception some lenses give on the two formats.

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04-20-2016, 09:18 AM	#2
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by davidsladek Hello, not sure if this has been posted before, but accidentally came across this very handy table of results for Pentax compatible lenses on both ASP-C and FF Lens Performance Survey - INTERPRETED OUTPUT Goes to show the different perception some lenses give on the two formats. Interesting and all based on user input. It is probably possible to do something similar with the reviews on this site. Steve

04-20-2016, 10:08 AM	#3
swanlefitte Pentaxian Join Date: May 2015 Location: Minneapolis Photos: Gallery Posts: 4,068	They must not post until at least 5 inputs since that was the lowest I saw and a number of lenses are missing like most of mine. Interesting to see.

04-20-2016, 10:56 AM	#4
dms Site Supporter Join Date: Aug 2011 Location: New York, NY Photos: Gallery Posts: 2,192	-- I would suggest adding coma, as a specific item. -- There should be a way of not using a reviewer(s) ratings if statistically highly questionable. I suggest the lens overall rating be used as the figure of merit--and if outside the average +/- 3 standard deviations it/they not be used. -- Breaking out (for the same lens) full frame and half frame as two separate lens categories makes a lot of sense. -- Nevertheless I believe the commentary is still far more important than a set of numbers.

04-20-2016, 12:21 PM	#5
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by stevebrot Interesting and all based on user input I had to grin when I read about the lenses that I own. Apparently there is a clutch of high distortion, bad flare FA 35/2 out there. Either that or folk are submitting multiple reviews. I also chuckled that some lenses were deemed cool on one format and warm on another (APS-C vs. 35mm FF) Steve

04-20-2016, 04:29 PM	#6
bxf Veteran Member Join Date: Jul 2010 Location: Lisbon area Posts: 1,660	Does make you wonder a bit about the accuracy of some of these numbers when a lens (Tamron 28-75) is shown as having greater vignetting on APS-C than it does on FF

04-20-2016, 05:15 PM	#7
monochrome Loyal Site Supporter Join Date: Mar 2008 Location: Working From Home Photos: Gallery \| Albums Posts: 26,276	Pictures (usually) don't lie.

04-21-2016, 04:55 AM	#8
Lititz Forum Member Join Date: May 2011 Location: greater Philadelphia area Posts: 83	Originally posted by stevebrot I had to grin when I read about the lenses that I own. Apparently there is a clutch of high distortion, bad flare FA 35/2 out there. Either that or folk are submitting multiple reviews. Yes, the FA35 report is quite odd: if I'm reading it right, the report shows more distortion, and more flare, on APS-C than on FF. If (stress on "if") format really can make a difference in such matters, I might have expected any problems to show more readily the other way around, given that more of the glass is in use in FF.

04-21-2016, 05:36 AM	#9
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451	All Pentax lenses are slow or very slow focussing. Something is rotten in Denmark.

04-21-2016, 08:42 AM	#10
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by normhead All Pentax lenses are slow or very slow focussing. Something is rotten in Denmark. ...or Deutschland, as may be... Almost all the non-Pentax lenses too. Steve

Very handy Lens Comparison query on Photozone

Win a Pentax Limited Lens: Raffle Now Live!