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iMac
2nd May 2010, 08:57 PM
Was a little bored this afternoon and since it wasn't really a nice day out there I decided to do a non scientific test of my lenses for sharpness.

This was performed indoors with on camera flash set to auto, all shots taken with autofocus @ f8 with target pinned to a door 4.5 feet away taken with the E-30 on a tripod and fired with a IR-remote, like I said not too scientific :) here are the results, all cropped close to the same.

Camera Settings - Auto WB, Auto Focus, Popup Flash set to Auto, ISO100, Pattern Metering, cross 5 point focused on the centre "Focus Here" on the target.

First ZD70-300 @ 70mm
http://e-group.uk.net/gallery/data/500/P5025212.jpg (http://e-group.uk.net/gallery/showphoto.php/photo/23132)

ZD40-150MKI @ 40mm
http://e-group.uk.net/gallery/data/500/P5025208.jpg (http://e-group.uk.net/gallery/showphoto.php/photo/23130)

ZD14-54MKII @ 42mm
http://e-group.uk.net/gallery/data/500/P5025211.jpg (http://e-group.uk.net/gallery/showphoto.php/photo/23131)

ZD14-42 @ 42mm
http://e-group.uk.net/gallery/data/500/P5025216.jpg (http://e-group.uk.net/gallery/showphoto.php/photo/23133)

ZD35
http://e-group.uk.net/gallery/data/500/P5025213.jpg (http://e-group.uk.net/gallery/showphoto.php/photo/23134)

OM50/1.8 (Manual focus of course)
http://e-group.uk.net/gallery/data/500/P5025215.jpg (http://e-group.uk.net/gallery/showphoto.php/photo/23135)

Ross the fiddler
3rd May 2010, 12:29 PM
Looks like a typical rainy day thing to do.
So now that you have done it, what are your thoughts on each of the lenses?
I also have that same line up of lenses, with the ZD35 macro (you do mean macro?) being my latest acquisition & the E30 (& E520).

Where did you get this particular focusing test chart? It is useful showing the measuring scale.

Ross

Barrie Norman
3rd May 2010, 01:34 PM
See what happens when you put ideas into my head, I have never trusted my Sigma 150 Macro, I prefer to use manual focus with it anyway but here is the result

http://e-group.uk.net/gallery/data/500/sigma150-E500.jpg (http://e-group.uk.net/gallery/showphoto.php/photo/23136)

By the way according to the test procedures you should have your camera at an angle of 45 degrees, you appear to be shooting square on. I googled "Tim Jackson Test Chart" and it gives you the PDF file instructions and the chart.

JerryE-1
3rd May 2010, 07:13 PM
When I used Nikon kit prior to moving back to Olympus I found that my 180mm f2.8 IFED autofocused accurately at close, test chart range but suffered from a hefty front focus error at infinity and far distances.

Testing a lens at close range doesn't always tell you the whole story.


Jerry

iMac
3rd May 2010, 09:10 PM
Looks like a typical rainy day thing to do.
So now that you have done it, what are your thoughts on each of the lenses?
I also have that same line up of lenses, with the ZD35 macro (you do mean macro?) being my latest acquisition & the E30 (& E520).

Where did you get this particular focusing test chart? It is useful showing the measuring scale.

Ross

Yes Ross I did mean the ZD35 Macro - this is a wonderful little lens, and I really like my E-30 as well.

iMac
3rd May 2010, 09:14 PM
See what happens when you put ideas into my head, I have never trusted my Sigma 150 Macro, I prefer to use manual focus with it anyway but here is the result

http://e-group.uk.net/gallery/data/500/sigma150-E500.jpg (http://e-group.uk.net/gallery/showphoto.php/photo/23136)

By the way according to the test procedures you should have your camera at an angle of 45 degrees, you appear to be shooting square on. I googled "Tim Jackson Test Chart" and it gives you the PDF file instructions and the chart.

Hi Barrie, yeah I wasn't too worried about front or back focusing I did the little test for a couple of reasons, 1: To give me something to do around the house instead of the honey do list. and 2: To try and compare the sharpness of each lens, and I think I will do this test over again and a bit differently and with a better subject.

Ross the fiddler
4th May 2010, 12:45 AM
Thanks Barrie,
I googled "Tim Jackson Test Chart" and it gives you the PDF file instructions and the chart.

It was getting a little late last night *zzz (that's my excuse & I'm sticking to it). It would have been my next step when I had looked closer. Tim has done a bit of work here getting this test together. It'll be some good bed time reading, all 19 pages of it.

At least with my E30, if there are any focusing discrepancies in any of the lenses, I can make the adjustments to correct it, assuming the lens is consistent. I've had a keen interest in the Sigma 150mm macro lens but have read it is a little inconsistent in its focusing accuracy. It has got to be better than using the ZD 70-300 with the EX25 for magnification & sharpness, although not bad results can be achieved with them.

Thanks iMacYes Ross I did mean the ZD35 Macro - this is a wonderful little lens, and I really like my E-30 as well.

I need to ensure I have enough light for the macro shots with the ZD 35 macro lens at close focusing range (twin FL36R's or good daylight &/or reflectors), but otherwise it is a nice lens, especially the price I got it for (1/2 price refurbished). I think I will stick to using the 14-54 II for anything further afield at 35mm because it seems to be a similar quality outcome (plus zoom ability) & with a larger aperture.

Ross

Graham_of_Rainham
4th May 2010, 01:21 PM
You may want to read http://www.kenrockwell.com/tech/lens-sharpness.htm

It's something I have been telling people for years but have never found it this well presented.

*chr

iMac
4th May 2010, 07:04 PM
You may want to read http://www.kenrockwell.com/tech/lens-sharpness.htm

It's something I have been telling people for years but have never found it this well presented.

*chr

Long but interesting read Graham, thanks for sharing.