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First of all, I assume you are not running out of travel on your focuser?
Are you trying to focus the object by eye or are you using a Bhatinov mask?
If you are looking at lunar surface or planet, the object will look soft even if in focus, this is a factor of seeing & why the best approach is to shoot video & then use Autostakkert to stack the best images. Unless you are extremely lucky, single exposure images on planets & lunar rarely result in a sharp image. A Bhatinov mask can be used for planetary imaging as well, just focus on a bright star first using the diffraction spikes generated by the mask & then slew to your target of choice. However, even without a bhatinov mask, you should be able to achieve good focus, it just won't look like good focus on your screen, this is a factor of seeing.. your eye/brain is able to deal with this (organic adaptive optics... lol) & you will see your image flutter in & out of focus. Your camera sensor well, on a still shot, you just have to be lucky whereas with video, 30 seconds will capture you a thousand or so frames & give you plenty of in focus frames to stack. You can then further sharpen using wavelets in Registax.
If you are trying to focus on a deep sky object, you really need to be using either a bhatinov mask on a bright star or alternatively, capture software that features a focusing component.'
I have found that trying to focus stars in a camera by eye is very hit & miss, generally more miss...
If you are running out of travel on your focuser, well, that's a different issue..
Hope this helps
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