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I'll just do a rough calculation for you. A 102mm F7 will have a focal length of 714mm. 714/25mm EP will give a magnification of 28X. To work out the FOV you'll need to know the FOV of the EP. For example if it was a plossl with FOV of 52degrees you divide that by 28 to get a 1.85 degree AFOV or 111 arcmins. Eta carina neb is 120' so it would just fit, you would likely need extremely dark skies to make the nebulosity out as well to that size in a 102mm.
Globs are disappointing because they just don't resolve well. With the exception of M13, 47TUC and Omega Centauri it is very difficult to resolve individual stars with this apperture. Not that you can't see the glob but it is just that, a hazy patch.
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