Imatest Tag Archive

Nikon TC-14E III vs TC-14E II Performance Comparison

I am currently in the process of testing the Nikkor 400mm f/2.8E FL lens in my Imatest lab and I am simultaneously also measuring the performance of the new Nikon TC-14E III teleconverter and comparing it to the older TC-14E II. Although I am planning to review the teleconverter separately,…

Nikon 200-400mm With and Without Filters

The Nikkor 200-400mm f/4G VR is a very versatile and sharp lens and those that own it or previously used it know that is a great choice for close action photography, such as photographing bears in Alaska. I recently saw a comment by a photographer, who claimed that the lens…

Not All Lens Filters Are The Same

The subject of using or not using protective lenses can invoke heated debates among photographers, with both sides often fiercely defending their choices. I am not going to debate whether it is right or wrong to use protective filters – that’s certainly a personal choice. I have been using them…

Do Filters Affect the Resolution of Lenses?

Just like the old “film vs digital” or the “Nikon vs Canon” debates, lens filters often create endless discussions on the Internet. Some people argue that one should never use protective filters, since it is another piece of glass in front of the lens that reduces resolution and emphasizes other…

How to Read MTF Charts

When my article on field curvature was published a while ago, where I talked about how one could do a quick analysis of lens MTF data and determine if it exhibits any field curvature, some of our readers expressed interest in understanding how to read MTF charts. Since we talk…

Image Degradation with Nikon Teleconverters

A fellow photographer recently asked me how much image degradation one would see with each Nikon teleconverter. As a nature photographer, I have been wondering myself about this for a while, but never had a chance to actually quantify what the image degradation figures would look like when using the…

Interview with Norman Koren of Imatest

A couple of weeks ago I had an opportunity to visit Norman Koren, founder of Imatest, LLC. I have been fascinated by his software for a while now and after evaluating the software, decided to purchase it to use in our lens reviews. When I found out that his company…