Lens Test Charts


tomkeet

Link Posted 26/08/2010 - 11:49
Noticed on EBay a seller from America http://stores.ebay.co.uk/Camera-lens-quality-test selling Lens Test Charts.
Are they of any use compared to the normal Front/Back focus charts?
Regards
Tom

K-3iii's.
SMC PENTAX-DA FISH-EYE 1:3.5-4.5 10-17mm ED [IF], SMC PENTAX-DA* 1:2.8 16-50mm ED AL [IF] SDM,
SMC PENTAX-DA 1:4 15mm ED AL Limited, SMC PENTAX-DA 1:3.2 21mm AL Limited,
SMC PENTAX-F 1:2.8 28mm, SMC PENTAX-FA 1:2 35mm AL,
SMC PENTAX-FA 1:1.4 50mm, SMC PENTAX-DA 1:2.4 70mm Limited,
SMC PENTAX-D FA MACRO 1:2.8 100mm WR, SMC PENTAX-DA* 1:4 300mm ED [IF] SDM,
HD PENTAX-DA 1:5.6 560mm ED AW,
HD PENTAX -DA 1.4x AW AF REAR CONVERTER,
PENTAX AF160FC Auto Macro Ring Flash.

https://pentaxphotogallery.com/artist-gallery/?artist_id=20168301

Algernon

Link Posted 26/08/2010 - 12:10
Instead of sending him a £10 Note why not just take a
picture of the £10 Note as your lens test

Then buy you and me a drink with the £10 Note

Then apart from him were all better off
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
Last Edited by Algernon on 26/08/2010 - 12:11

tomkeet

Link Posted 26/08/2010 - 12:28
Algernon wrote:
Instead of sending him a £10 Note why not just take a
picture of the £10 Note as your lens test

Then buy you and me a drink with the £10 Note

Then apart from him were all better off

I sat here trying to convince myself they were of some use, but could not convince myself!
Your idea of a £10 note sounds a better choice.
Regards
Tom

K-3iii's.
SMC PENTAX-DA FISH-EYE 1:3.5-4.5 10-17mm ED [IF], SMC PENTAX-DA* 1:2.8 16-50mm ED AL [IF] SDM,
SMC PENTAX-DA 1:4 15mm ED AL Limited, SMC PENTAX-DA 1:3.2 21mm AL Limited,
SMC PENTAX-F 1:2.8 28mm, SMC PENTAX-FA 1:2 35mm AL,
SMC PENTAX-FA 1:1.4 50mm, SMC PENTAX-DA 1:2.4 70mm Limited,
SMC PENTAX-D FA MACRO 1:2.8 100mm WR, SMC PENTAX-DA* 1:4 300mm ED [IF] SDM,
HD PENTAX-DA 1:5.6 560mm ED AW,
HD PENTAX -DA 1.4x AW AF REAR CONVERTER,
PENTAX AF160FC Auto Macro Ring Flash.

https://pentaxphotogallery.com/artist-gallery/?artist_id=20168301
Last Edited by tomkeet on 26/08/2010 - 12:29

fatspider

Link Posted 26/08/2010 - 12:36
I thnk the idea of beer was better

And you could use the empty bottles label for focus tests, as long as you sleep off the beer first
My Names Alan, and I'm a lensaholic.
My PPG link
My Flckr link

thoughton

Link Posted 26/08/2010 - 12:36
There are some available for free download, I've got a copy, but you'll need to get it printed on a pretty good printer at A3 size for it to be useful as a test chart. (At A4 even a 300dpi printer will merge the finest converging lines). I'll see if I can dig up a link, from memory it was some university site.
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
Flickr • Fluidr • PPG • Street • Portfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
Last Edited by thoughton on 26/08/2010 - 12:38

Algernon

Link Posted 26/08/2010 - 13:37
Not sure how much use it is, but there's one free
from AP. Link in this thread.
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

thoughton

Link Posted 26/08/2010 - 14:16
Had a little dig, the one I use is from Cornell University. Here.
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
Flickr • Fluidr • PPG • Street • Portfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
Last Edited by thoughton on 26/08/2010 - 14:16

gartmore

Link Posted 26/08/2010 - 14:26
The only lens charts I have ever seen in meaningful use (a BBC camera maintenance workshop) was where the chart stand and the camera stand were cast steel and both bolted to a concrete floor. You will never achieve any meaningful or accurate results any other way, I'm afraid.
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -

MrCynical

Link Posted 26/08/2010 - 14:30
Algernon wrote:
Instead of sending him a £10 Note why not just take a
picture of the £10 Note as your lens test

Then buy you and me a drink with the £10 Note

Then apart from him were all better off

Except for tomkeet being in prison of course, given that photographing banknotes is illegal

As far as test charts go, the only one I bother with is testing for front/back-focusing, from focustestchart.com
Last Edited by MrCynical on 26/08/2010 - 14:31

thoughton

Link Posted 26/08/2010 - 15:13
gartmore wrote:
The only lens charts I have ever seen in meaningful use (a BBC camera maintenance workshop) was where the chart stand and the camera stand were cast steel and both bolted to a concrete floor. You will never achieve any meaningful or accurate results any other way, I'm afraid.

I can see where you're coming from Ken, we'll never be able to judge lines per millimeter or any precision measurements like that. What we can do though is tell if a lens is soft at the edges or corners, or find the sharpest aperture.
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
Flickr • Fluidr • PPG • Street • Portfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!

Algernon

Link Posted 26/08/2010 - 18:21
gartmore wrote:
The only lens charts I have ever seen in meaningful use (a BBC camera maintenance workshop) was where the chart stand and the camera stand were cast steel and both bolted to a concrete floor. You will never achieve any meaningful or accurate results any other way, I'm afraid.

These wouldn't have been for consumer grade cameras and lenses for which testing in the normal working environment is perfectly satisfactory/desired. Digital has poor resolution anyway so a decent tripod is more than adequate. Flash could be used to minimize any shake. Correct/precise focus is the most important part of any lens test.

This is a perfectly adequate test for our purposes.
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

tomkeet

Link Posted 26/08/2010 - 19:04
Thanks for the information. Think I will just stick to the normal Front/Back focus charts.
Regards
Tom

K-3iii's.
SMC PENTAX-DA FISH-EYE 1:3.5-4.5 10-17mm ED [IF], SMC PENTAX-DA* 1:2.8 16-50mm ED AL [IF] SDM,
SMC PENTAX-DA 1:4 15mm ED AL Limited, SMC PENTAX-DA 1:3.2 21mm AL Limited,
SMC PENTAX-F 1:2.8 28mm, SMC PENTAX-FA 1:2 35mm AL,
SMC PENTAX-FA 1:1.4 50mm, SMC PENTAX-DA 1:2.4 70mm Limited,
SMC PENTAX-D FA MACRO 1:2.8 100mm WR, SMC PENTAX-DA* 1:4 300mm ED [IF] SDM,
HD PENTAX-DA 1:5.6 560mm ED AW,
HD PENTAX -DA 1.4x AW AF REAR CONVERTER,
PENTAX AF160FC Auto Macro Ring Flash.

https://pentaxphotogallery.com/artist-gallery/?artist_id=20168301

Anvh

Link Posted 26/08/2010 - 20:20
Algernon wrote:
Digital has poor resolution anyway

Don't say that so easy, it's hard to truly compare the two formats since they are different.
Here is a comparison 7 years old with a 135 format DSLR against a Pentax 6X7, according to you the DSLR doesn't stand a chance, here just take a look link
Stefan


K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ

Algernon

Link Posted 26/08/2010 - 20:48
Thanks Stefan, I'll read through that tomorrow, but that's not as high as the resolution I'm talking about. Zeiss have managed 400lpmm on film (which is really tiny 0.0025mm). This site gives the maximum digital resolution as 87.5lpmm which means the testing setup doesn't need to be anything more than a decent tripod. Normal film testing used to yield 120-140lpmm again with just a decent tripod.
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

gartmore

Link Posted 26/08/2010 - 21:12
Algernon wrote:
gartmore wrote:
The only lens charts I have ever seen in meaningful use (a BBC camera maintenance workshop) was where the chart stand and the camera stand were cast steel and both bolted to a concrete floor. You will never achieve any meaningful or accurate results any other way, I'm afraid.

These wouldn't have been for consumer grade cameras and lenses for which testing in the normal working environment is perfectly satisfactory/desired. Digital has poor resolution anyway so a decent tripod is more than adequate. Flash could be used to minimize any shake. Correct/precise focus is the most important part of any lens test.

This is a perfectly adequate test for our purposes.

How so? Please give evidence for each of your assertions.
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
Add a Comment
You must be registered or logged-in to comment.