Yes, quite a bit of difference! Viewfinder magnification is going to be the biggest and most easily-seen difference. Pentax leads the way in terms of biggest and best finder image at the true entry-level. The Nikon D70 for example, has a very low finder magnification of around .76. Olympus also has some very,very low finder magnification measurements. Konica-Minolta's Maxxum 7D, while not entry level, has a very GOOD, almost exemplary viewfinder image, with high magnification and a very high quality all-glass pentaprism and a good viewfinder screen system.
Eye relief is a big factor for eyeglass wearewrs like myself, but the raw numbers can be a bit deceptive at times, with rectangular eyepieced camera models typically offering a bit better eye relief than round-eyepiece cameras,at least in my experience. Eye relief is something you can easily see when you,yourself actually handle a prospective camera. On two models with similar specifications, one may have a fairly easily-seen advantage in actual use, in the real world. Again, the Maxxum 7D for example, is very easy for me to see through. Better,and easier than a competing model with a slightly higher specific relief in millimeters.
Seeing is believing. "Most" entry level D-SLR's have poor finder image quality, but a selct few are better than their peers. This is one reason to shop in a store,and to actually try out prospective cameras. But,basically, look at finder magnification (higher the better) and eye relief, as well as the overall,total finder image quality. The bestway to make an actual decision is in person.SOmetimes the numbers don' quite add up the way they should,and you can NOT judge a finder by its specs alone!
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Happy Shooting!
Derrel
Fu-ji EssWun(on extended loan),EssTu,Nik-On
DeeSvnD,DWun,DTuEx. And a E-Ohs TwunT-D