Sky and Telescope
|90mm achromatic refractor operating at
90mm achromatic refractor that ships with a 25mm Plossl and 9mm Plossl eyepiece with an
Alt-Az mount on an aluminum tripod.
everyone! This will be a review of the 90mm Coulter Optical refracting
telescope on an alt. az. mount available from the E-Scopes Web Store. This
telescope tube assembly is your normal achromatic, F/11.1, 3.5 inch. There
are no surprises here except a couple of nice ones. According to the owner of
the store, these are not your same as "all the others" made in China
'scopes. These are actually made in Taiwan, and seem to have better Q.C.
then the "blue ones".
The 'scope ships with a very heavy duty aluminum tripod, and a heavy duty (very
stable) alt. az. head with fairly decent slo-mo controls. There are also
included two mediocre Plossl style eyepieces, of 25mm and 9mm focal ratios.
These eyepieces are not junk, but they only have 43 degree and 40 degree
fields of view. A little narrow for a true Plossl design, but checking the
number and spacing of elements with a laser, I found that they are. They
do give sharp images though, and I don't believe any beginners buying this
'scope should rush right out to buy replacements.
Using this telescope is fun, and easy. The alt. az. mount works smoothly,
and beginners will not have to worry about learning to polar align, use setting
circles, or any of that eq. mount stuff that can put someone just learning the
sky off. Just get your star charts, find out where to find whatever
planets are up, and enjoy yourself!
The optics of this 'scope seem to be first rate. Using eyepieces from my
own collection and a good Barlow reveal that this tube assembly is probably
better than it has to be. Great detail on Jupiter and Saturn. I have
not looked at Mars with it, but I have every reason to think that it will do as
fine a job on that planet as all the others. It star tested quite well,
with the same concentric circles on either side of focus. I'm almost leery
of how good this 'scope is. Could all of these be this good? I sure
hope so, because, I would hate to steer anybody wrong here. All I can do
is rate this example, and I must say, the lack of false color is truly amazing!
That would be the first nice surprise I alluded to in the beginning of this
Now here is the second one. This telescope costs all of.... are you ready
for this? $249.00. With a shipping cost of $14.00 to my door in
North Branch, Mi. I have to give this 'scope a superaltive rating on cost
to value ratio. I highly recommend this to someone looking for a nice
'scope to get started with. I bought it for myself just so I could have a
"real" refractor to use when I felt like it. I have plenty of
scopes to look through, but when I don't feel like wrestling something big, or
just want a quick look, I'm starting to reach for this one more and more.
by Ed Conley - firstname.lastname@example.org
- North Branch, MI