Anyone got some resution chart result from DFA* 70-200?

Lev · 09-17-2021, 12:41 PM

Originally posted by stevebrot

Go out and take pictures. If it does not perform to your expectations, haggle with the seller. If that seems clumsy, sell the lens.

I would expect that if members here had done such testing, they probably would have posted something and a tradition of sorts might have sprung up. Strangely, few, if any, have the patience or expertise to actually do that kind of testing. I can't remember seeing such in the fifteen years or so I have been on PF.

Steve

Steve, looks like I'm only one here who gone crazy. Anyway, testing charts and all related stuff is very complicated thing, I understand that, and there is no need for normal user to know every details there but very basics like sharpness and decentering tests are imho important when someone is purchasing new or used lens, doesn't matter. It is just for me, better to use dedicated chart for this purpose instead of shooting rocks.

normhead · 09-17-2021, 02:15 PM

Originally posted by Lev

Steve, looks like I'm only one here who gone crazy. Anyway, testing charts and all related stuff is very complicated thing, I understand that, and there is no need for normal user to know every details there but very basics like sharpness and decentering tests are imho important when someone is purchasing new or used lens, doesn't matter. It is just for me, better to use dedicated chart for this purpose instead of shooting rocks.

Not that there's anything wrong with shooting rocks...

Lev · 09-17-2021, 02:34 PM

Originally posted by normhead

Not that there's anything wrong with shooting rocks...

Welcome to the thread!! which only god knows why I have started by the way.

**c.a.m** · 09-17-2021, 05:09 PM

Originally posted by Lev

only god knows why I have started by the way.

Your original post made sense to me.

I've used various charts to examine the 'sharpness' profile and focus accuracy of my lenses. However, the resulting images are not the sort of thing I would have posted here for general discussion. I think that there probably are other members who also tinker with this type of testing.

Regrettably, I do not own a DFA* 70-200.

- Craig

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Architecture Test of a DFA* 70-200 mm f/2.8 on a K3 @ 70 - 100 and 200 mm FL and f/11.	RICHARD L.	Post Your Photos!	9	09-13-2021 04:32 AM
Still Life First test of my new DFA* 70-200 mm f/2.8 @ 200, 140, 100 and 70 mm and f/6.3 on K3	RICHARD L.	Post Your Photos!	2	01-27-2021 06:14 PM
Dilemma: Portrait Shooting between DFA 24-70 or DFA 70-200	Gerard_Dirks	Pentax SLR Lens Discussion	22	10-05-2017 04:34 PM
eye chart? what eye chart??	dcmsox2004	Post Your Photos!	5	08-20-2009 06:41 AM

09-17-2021, 12:41 PM	#16
Lev Veteran Member Join Date: Aug 2015 Location: Tbilisi, Georgia Posts: 1,197 Original Poster	Originally posted by stevebrot Go out and take pictures. If it does not perform to your expectations, haggle with the seller. If that seems clumsy, sell the lens. I would expect that if members here had done such testing, they probably would have posted something and a tradition of sorts might have sprung up. Strangely, few, if any, have the patience or expertise to actually do that kind of testing. I can't remember seeing such in the fifteen years or so I have been on PF. Steve Steve, looks like I'm only one here who gone crazy. Anyway, testing charts and all related stuff is very complicated thing, I understand that, and there is no need for normal user to know every details there but very basics like sharpness and decentering tests are imho important when someone is purchasing new or used lens, doesn't matter. It is just for me, better to use dedicated chart for this purpose instead of shooting rocks.

09-17-2021, 02:15 PM	#17
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451	Originally posted by Lev Steve, looks like I'm only one here who gone crazy. Anyway, testing charts and all related stuff is very complicated thing, I understand that, and there is no need for normal user to know every details there but very basics like sharpness and decentering tests are imho important when someone is purchasing new or used lens, doesn't matter. It is just for me, better to use dedicated chart for this purpose instead of shooting rocks. Not that there's anything wrong with shooting rocks...

09-17-2021, 02:34 PM	#18
Lev Veteran Member Join Date: Aug 2015 Location: Tbilisi, Georgia Posts: 1,197 Original Poster	Originally posted by normhead Not that there's anything wrong with shooting rocks... Welcome to the thread!! which only god knows why I have started by the way.

09-17-2021, 05:09 PM	#19
c.a.m Site Supporter Join Date: Jan 2013 Location: Ottawa, Canada Photos: Gallery \| Albums Posts: 4,189	Originally posted by Lev only god knows why I have started by the way. Your original post made sense to me. I've used various charts to examine the 'sharpness' profile and focus accuracy of my lenses. However, the resulting images are not the sort of thing I would have posted here for general discussion. I think that there probably are other members who also tinker with this type of testing. Regrettably, I do not own a DFA* 70-200. - Craig