Not confusing at all. Very well articulated and extremely helpful. I knew I was going to have to crop, and it was going to end up somewhere in 125 ppi range. Cropped it ended up being like 96, so I made the images a little smaller printed out for the client. (18"). I think they look pretty good, not as good as I hoped but acceptable. Thanks for your help.
The simple answer is... maybe. The D100 image is 3008 x 2000 pixels. If you divide 3008 pixels by 24 inches, you would be printing 125 pixels per inch on the long side. 125 pixels per inch is a little low for a good sharp print. 175 pixels per inch would give a pretty good print, but you could only make a print about 17 inches wide.
Photoshop has some capability to add pixels and upsize an image. In some cases, this can allow you to make a much bigger print that is acceptably sharp.
But you also have to consider the viewing distance. A print that would look soft with your nose almost touching it may look fine from 2-3 feet away, which would be a reasonable viewing distance for a 24-inch-wide print.
You mentioned wanting to get a 24" x 20" print. That size of a print would have an aspect ratio (width divided by height) of 1.20, whereas the format of a D100 image gives an aspect ratio of 1.50. So you'll either have to crop from the sides or have borders in the print. Cropping from the sides would reduce the pixels from 3008 to 2400, which would reduce your number of pixels per inch.
Does anyone have any info on what were the prizes? Not the travel packages but the category prizes. Did not find any info on that yet. And if anyone knows a site where I can have a look at some photos from the award ceremony and the exhibiton itself, I'd be happy to browse through them (BTS website does not have any fresh info yet). I could not attend, as I'm at another part of the world (general category, first prize)
Small strobes are desirable because you can fit them into tighter places which you'll find yourself doing quite often when shooting macro. I prefer the 105mm for working in the 1:1 macro range because of the increased working distance, but it is less utilitarian and can be a little frustrating to use. My recommendation is to stick with the 60mm lens for now and grow into the 105mm when you find yourself needing the increased working distance. Diopters are difficult to work with with the 60mm because the lens already has a small working distance, but something I do quite often with my 60mm is stick a 2x teleconverter on it. It'll give you a little more versatility out of your lens if you find yourself wanting to go 1:1 and beyond.
Thanks Mike, So I should hold off buying the 105 for now you think? Would my ys-60 strobe be a good fit when using the 60 mm? Could you put up a link to the 2x teleconverter you mention?