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Originally Posted by cjmarsh81
The skywatcher came with a 10mm and 25mm super plossl. Don't know what brand, probably Synta or Skywatcher.
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If these are the silver bodied ones, they are not half bad for cheap plossls, and alot better than the el-cheapo Andrews ones.
When focal length get much shorter than 10mm, plossls become very hard and uncomfortable to look ( more like squint ) through. Consider getting a barlow lens and using that with your 10mm plossls.
It will be very rare that you can usefully use a 4mm ep in your dob. 90% of my planetary viewing is done at about 200x, and sometimes up to 250x in excellent conditions.