Not perfect, but much better than the old one
Friday, 30 October 2015 | Phillip
This finderscope was purchased to replace the standard red dot device which came with my 8" Celestron SCT, 10 years ago. This unit claims to improve upon the old Ďred dotí, and by and large it does. The glass display area is much larger making it easier to look through. The red dot always obscured the star you were looking for, but the new display has 2 concentric circles. The star is placed in the centre of those circles, and remains visible throughout. The adjustment knobs are easy to find, and more importantly are a completely different type to the on/off switch. With the previous model it was all too easy to accidentally move the alignment knobs when trying to turn it on. The battery is the same type as the old one, (CR2032) so my stock of replacements can still be used. One thing that hasnít changed is that the battery compartment is still on the bottom of the unit. In the old unit, the battery often slipped on to the floor while trying to get it in and out. The battery is now secured by a screw cap which opens using a coin as a tool. However, there isnít enough room between the finder and the body of the telescope to use a coin while it is on the bracket. Therefore you are forced to remove the unit from the mounting bracket and turn it upside down in order to change the battery. The old finder required screw bolts to fix the unit to the bracket. The new one comes with bolts with a thumb screw which should be easier. However, I was not able to tighten the thumb screw bolts sufficiently tightly to grip the mount. The holes in the plastic are probably just a little too small and the resistance too great. It might be possible to wear the hole down by working the bolt in and out a few times. Since the mounting bracket is identical to the old one, I simply used the bolts from the original unit, and tightened with a screwdriver instead. The previous on/off switch was hidden on the side, but the new one is on top, and the 2 white dots which will line up if the unit is off can be seen much more easily.
It is certainly worth the upgrade.