I finally got around to writing a review on my newest telescope which is a refractor and an APO to boot. It is a Burgess Optics 91mm APO. It has a focal ratio of f6.6 which comes to a focal length of 600mm. It is 52 cm (20.5 in) long with the dew shield retracted, 57cm (22.5 in) extended and 3 Kg (6.6 lb) without rings and dovetail and 4 Kg (8.8 lb) with rings and dovetail. I picked it up so I could carry it around with me on airplanes as I travel so much on business. I picked up a Stelarvue case (CN6) which carries the scope, a 2 inch William Optics diagonal, 2 2 inch eypieces, 2 1.25 inch eyepieces, the multi-reticle finder, the rings and dovetail. And the case passes for carry-on. I put a WO eztouch head and manfrotto tripod into checked luggage and I am set.

But enough of that, here is the video I did for a review, a written review follows, enjoy.

Now here is my written review of the BO 91mm APO:

As I travel all the time, and all my equipment is in storage, I was looking for a scope which was:

1- airline portable

2- grab and go size but still with decent light grab

3- be good for astrophotography when I actually did have all my gear together again

I looked at quite a few models. A stellarvue SV90 triplet was one, William Optics Megrez 90, as well as a few others. But then I happened upon news of a 90mm triplet coming out from Burgess. I checked on availability and I found one could be delivered in a couple of weeks so I took it.

It arrived nicely packed, double boxed with lots of packing foam and popcorn. In the box where, the optical tube with a 91mm APO triplet objective, dual speed lockable focuser, lockable retractable dewcap, a Burgess MRF, a nice set of rings and a vixen style dovetail plate.

Everything was in good order so I plopped it onto my William Optics Ezytouch mount and did a little daylight viewing out over the ocean.

The views where excellent clear with vibrant colors but absolutely no false color at all.

Night viewing was equally pleasurable. I have had the chance to throw a lot of different eyepieces at this little gem and viewed many different targets. And the views are great. Wide field viewing of star fields and large targets are very pleasing. Using my WO 40mm SWAN, the field of view is jaw dropping. Open clusters are a real treat with this scope as well. Lunar and planetary detail are very nice too, especially considering the limited aperture and focal length of the system.  And although the 40mm SWAN does have image drop-off on the outer edges of the field the performance was even better in the BO 91 than I have seen in other scopes when using it so that says something.

Using a 4mm Lanthanum Jupiter offers lovely colors and good detail. Exploring the lunar terminator is a treat as well with various eyepieces. And as to false color, it isn't there and I have looked for it. I have notices a little touch of green on the limb of the moon a couple of times, but not always and it was transient at that. And it was only with one eyepiece, a baader.

As I stated earlier most of my gear is in storage so no real astrophotography has been possible but I did get a few shots, plus some nature pics with a canon 400D.

The moon:

Deneb:

Albeiro (forgive the squiggles alt az mount) but just for the color performance:

Baby storks on a village church near Salamanca, Spain. Note the lack of false color.

and

And here are some pics of the scope itself:

Focuser:

Objective:

Mechanically and cosmetically I have nothing but praise for this scope except for one small complaint. The focuser is not rotatable, which I would have liked. There is also a little play in the coarse focus. There is a slight delay when changing focus direction, but to be fair it did not affect focusing in the field at all. When you hit focus you hit focus well. Also this play was not evident in the fine focus. As well, the focus handled any weight I threw at it, even without locking it down.

The lock on the dew shield was a nice touch too. The shield does not droop, sag or slide while in use.

All in all I am very happy with my purchase and am really looking forward to doing some astrophoto work soon.