analogman wrote:
After careful deliberation I have decided to give up all my Nikon DSLR equipment, totally. I would like to purchase a camera that is smaller, with dedicated lens that has an approximate range of 18 to 200mm with adequate aperture, is easy to use and takes good photos. I understand this is asking a lot. Any suggestions?
Thank you for your time.
You didn't tell us what Nikon camera(s) you've been using, so we can't compare potential image quality. I am guessing the Nikon DSLR(s) you've used are APS-C format, since an 18-200mm lens is almost certainly designed for that format. AFAIK none is made for full frame (there are other wide range zooms for FF, such as 28-300, 24-240mm, etc.)
18mm on APS-C is roughly equivalent to 24mm on full frame. 200mm on APS-C is roughly equal to 300mm on full frame. Why is this important? Well, if you go with a "bridge" camera... a camera with a viewfinder and a non-interchangeable lens... their lenses are commonly marketed with "full frame equivalent" focal lengths. This is because that type of camera uses a wide range of different sensor sizes... APS-C, Micro 4./3, 1", 1/2.3" and 1/3", so the manufacturers state the zoom range in FF equivalent to be able to compare them with each other. The actual focal lengths are stated in the specs and with the cameras that use the smallest sensors, in particular, are often a great deal less than the commonly used FF equivalent. Again, this is done to "fool you", but is done to allow comparison across all those different sensor formats.
Some sellers use "35mm equivalent" instead of "full frame equivalent" (in case you are unaware, so-called full frame cameras use a sensor that's approx. 24x36mm, which was the most common format used on 35mm film).
There are a variety of "bridge" cameras with non-interchangeable lenses that might come close to meeting your needs. The reason I am pointing you toward them is because they have a viewfinder, which I suspect any DSLR user will prefer over the often frustrating experience having to always use the cameras rear LCD screen to compose your images.
Something to keep in mind with "bridge" cameras is the larger sensors tend to have fairly narrow zoom ranges (such as 24-70mm FF equivalent), while the "super zoom" type (such as 24-3000mm) have tiny little sensors. The larger sensors make for better image quality and more usable higher ISOs.
Based upon the above criteria (viewfinder, 22/24/25mm to 200/250mm zoom range) I drilled down on the B&H Photo website and only find four cameras remain: two Panasonic and two Sony. They all appear to use 1" sensors and are all 21MP (might even all use the same sensor, since Sony sells them to many other camera manufacturers). Prices range from $400 to almost $1300:
https://www.bhphotovideo.com/c/products/Point-Shoot-Digital-Cameras/ci/8612/N/4288586279?filters=fct_a_features_1123%3Aviewfinder-built-in%2Cfct_cameras-kits_7135%3Acameras-only%2Cfct_fixed-lens-zoom-lens_7220%3Azoom-lens-cameras%2Cfct_telephoto-35mm-equiv_4088%3A200mm%7C250mm%2Cfct_wide-angle-35mm-equiv_4080%3A22mm%7C24mm%7C25mmNote that these cameras all have their viewfinders off to the lefthand side, rather than the centered viewfinder "hump" typically found on SLRs and DSLRs. Some people like this arrangement, others do not.
Search for reviews on the above models if they interest you.
I don't know what DSLR cameras and lenses you use now, so cannot say if the image quality these cameras produce will come close. The sensor is much smaller than an APS-C DSLR's. The 1" sensor has an area of 116 square millimeters. By comparison, a Nikon APS-C sensor is around 370 square millimeters. As a result, 21 million pixel sites on the APS-C sensor can be much larger and less crowded than 21 million pixel sites on that 1" sensor. The smaller, more crowded pixel sites cannot capture as much fine detail and are much more prone to digital noise.
I would highly recommend you also consider one of the APS-C or Micro 4/3 mirrorless cameras with a viewfinder (just as with the non-interchangeable lens cameras, there are some mirrorless models that don't offer a viewfinder
An APS-C or M4/3 mirrorless would still give you option to change lenses if you wish, but can be nearly as compact and lightweight as the "bridge" cameras with a non-interchangeable lens.
Some examples of these mirrorless with a viewfinder are:
Canon M50 Mark II (APS-C, 24MP)
Canon M6 Mark II (32.5MP), accessory viewfinder that's sold separately.
Nikon Z50 or Ffc (both APS-C, 21MP)
Sony a6600 or a6400 (both APS-C, 24MP)
Fuji S-10 or XT-3 (both APS-C, 26MP)
Olympus OMD-EM10 Mark IV (Micro 4/3, 20MP)
Panasonic DC-G9 (Micro 4/3, 20MP)
You might be able to find exactly the lens you want: 18-200mm. It depends upon the system. There isn't one like that in the Canon or Nikon systems. Canon offers a kit with EF-M 15-45mm and 55-200mm lenses. I included the Canon M6 Mark II above, even though it doesn't have a built in viewfinder, because is has an exceptionally high resolution sensor and there's an optional viewfinder available for it. Nikon offers a kit with 16-50mm and 50-250mm lenses. I'll leave it to you to explore the Sony, Fuji, Oly and Panasonic systems, if interested.