A mirror lens may well have different characteristics than a refracting lens - sharpening algorithms probably assume refracting.Дў. Photozoom 8 is current so 7 is heavily discounted.ДЎ. *** Photozoom 7 is available at Ashampoo for $20. To the UHH people who hate science and love to make 8 pages of anecdotal happenings I apologize, but my original training was in analytical testing and that has become part of my me. A discussion of Camera Testing with Resolution Grids is discussed in the following article: **Field images, actual like landscapes, are complex photos are too muddled to do comparisons with because of perception, the mind/eye/image-memory is too easily confused. Photographing such a grid takes away extraneous issues and is clearly black and white lines of smaller and smaller size and separation. Using a lens like 85mm gives good portrait like results for photographing a Lens Resolution Grid. Sharpening and enlarging are two separate issues and are worthy of two posts. Sharpening is sharpening, increasing resolution for enlarging is just that and is the purpose of Topaz Gigapixel AI and ON1 Resize. I commend you, JimH123, few UHH people like or do such studies and prefer to give opinions and/or repeat what their Dear Aunt Sally told them. I am leaning towards the Topaz Sharpen AI - Sharpen Mode as having the best detail. But the DxO version is a bit more saturated, and I should return to it and desaturate a tiny amount and see if there is any improvement.Д«ut I am seeing that the resizing SW is not making the detail easier to read. The 4th, image B4, was calling Topaz's Sharpen AI from Lightroom, using Sharpen Mode, and again sized to the same size. The image was then displayed the same size. The 3rd, image B3, again started with the RAW and resized it using Topaz Gigapixel AI and it was resized 2X just like ON1 Resize. I then displayed it the same size as the left image. The 2nd, image B2, used the original RAW and Resized it 2X using ON1 Resize. The plane was cropped to make the nose larger.

I tried to sharpen it the best I could and the numbers look like the are 7855 with the 7855 also upside down and 100 or maybe its 700 further out on the nose. Image #B is an overlay with the nose visible for all four images.ДЇar left, image B1, is with DxO Photolab 3.

Even when downloading, it is difficult to even tell that there are numbers on the nose, let alone read them. I will be using a image captured using a Sony A7iii with a Minolta 500mm Reflex lens and will look at closeup results of several applications to see which does the best job of making some numbers on the nose of the aircraft look the sharpest.

On1 photo raw a7iii