NikonGear'23

Gear Talk => Lens Talk => Topic started by: David H. Hartman on March 19, 2016, 23:08:26

Title: Lens test chart...
Post by: David H. Hartman on March 19, 2016, 23:08:26

Here are a couple of lens test charts I though some members might find useful. They are intended for printing on a 600 or 1200 dpi laser printer but I think they will print OK on an inkjet. The first is 600 dpi and the second is 1200 dpi. I made then in Photoshop based on a lens advertisement in an old camera magazine add. I use these when AF fine tuning using a simple, "Is A better or B." just like your ophthalmologist when testing for a glasses prescription. 

(https://c2.staticflickr.com/6/5574/15273209195_71d838dbb7_n.jpg) (https://c2.staticflickr.com/6/5574/15273209195_5172f0890d_o.jpg)

WARNING: At the bottem of this link lies one hell of a file  Big file (Big file, Big file) Big Bad file...

(https://c2.staticflickr.com/4/3864/15086641737_48f2cd34f0.jpg) (https://c2.staticflickr.com/4/3864/15086641737_ba17277996_o.jpg)

Dave

Apologies to Jimmy Dean

Title: Re: Lens test chart...
Post by: Dr Klaus Schmitt on March 21, 2016, 07:55:06

THX, but 2nd one produces an error.

Btw. I prefer square or round symmetrical targets, so as to make visible asymmetric errors in lenses (decentering etc.)

Title: Re: Lens test chart...
Post by: elsa hoffmann on March 21, 2016, 08:00:05

I could download both - 6.1 and 2.9 Mb?

Title: Re: Lens test chart...
Post by: David H. Hartman on March 21, 2016, 13:07:23

I just had no problems downloading the big file just now but I've had problems in the passed. I don't know if it was Flickr where the file is located or if it's something else. This might work...

https://c2.staticflickr.com/4/3864/15086641737_ba17277996_o.jpg

To check for decentering or alignment problems I think a white disk on a black background is all that's needed. I found a problem with my AF 35-70/2.8D checking AF on a soda can laying on it's side so the top faced me. It was a really bad feeling when I saw image smearing in only one direction. This chart helps to identify astigmatism. 

This chart helps to identify astigmatism. I like that I can print them and stick them up and text and if they get damaged they cost little more than the sheet of paper. Another thing that make them important to me is I don't have any brick wall located nearby.

Dave

Title: Re: Lens test chart...
Post by: beryllium10 on April 14, 2016, 05:54:35

Thanks Dave, both downloads worked for me.  I also have no convenient brick wall, so these will be useful.

Cheers - John