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Swift Model 838 Review

Swift Model 838 Review

Swift Model 838 with ‘Saturn seen From Titan’ by Chesley Bonestell, from The Conquest of Space, 1958.

If the past is another country, then the Sixties seem now like a strange mix of France and Vanuatu – simultaneously close and familiar, distant and exotic. I remember the Sixties - just. But it’s becoming increasingly hard for me to imagine a time when TV was black-and-white, the local car showroom had Morris Minors in the window and a calculator had cogs. Then again, in the Sixties men went to the Moon, something beyond us today. Back to the future.

Having said that, though the Space Race was delivering feats we couldn’t match now, we knew remarkably little about the Solar System in the early Sixties; really astoundingly little. Even by mid-decade – my Swift Model 838 was made in 1964 – planetary science had scarcely advanced from the days of Percival Lowell. So when some lucky girl or boy first unwrapped the Swift Model 838’s deluxe wooden box, for birthday or Christmas, then breathlessly assembled it and turned it on the Moon or a bright planet, they were looking at terra incognita.

Again, this is hard to imagine now. Children grow up with alien worlds delivered in HD CGI with every SciFi blockbuster. But a child looking through the Swift from the back-garden of a suburban semi in 1964 could look at real alien worlds and imagine … almost anything. Just a decade later that would no longer be possible. It is this, I think, that imbues late ‘50s and early ‘60s telescopes like the Swift with a unique aura: one foot in the fantasy-world of Lowell, the other in the space age.

1964

To set the Swift model 838 in context, I want to reach back to the mindscape of its new owner in 1964.

Fifty years ago the Moon landings were five years away, the first successful flyby of Mars still a year in the future. But to say that makes the early Sixties sound modern. In fact, in 1964 most of what we knew about the solar system came from a few professional astronomers glued to the eyepieces of half a dozen or so large refractors, just as it had for a century.

So to get a sense of what might have been in the Swift 838’s first owner’s mind, when they first set their new telescope on the sky, I’ve assembled some quotes from contemporary titles our new astronomer might have had on his or her bookshelf:

Mercury

“One hemisphere is perpetually scorched by the solar rays, while no gleams of sunlight ever penetrate to the far side.” (Guide to the Planets, Moore, 1957)

Venus

“when we are confronted with two such dissimilar pictures, each supported by leading astronomers, our lack of positive knowledge is brought home to us. On the dustbowl theory, life of any kind … is obviously impossible; on the ocean theory … there is a loophole for very primitive marine creatures.” (Guide to the Planets, Moore, 1957)

The Moon

“As the dividing line between light and darkness, the terminator, advances, the floor of Plato grows darker. What happens in the crater of Plato? Evaporation of moisture forming a light-absorbing mist? Or just melting ice?” (The Conquest of Space, Ley and Bonestell, 1958)

 

Mars

“On the morning of June 4, 1956, I was on Mount Wilson working with the 60-inch reflector … A magnification of 700 made it seem as if Mars were being viewed from a spaceship … The bright red regions were covered with innumerable irregular blue lines, like veins running through some mineral. Several minutes passed before it occurred to me these markings must be canals.” (Mars, Richardson, 1965).

 

“… we are forced back to the most obvious theory of all – that the dark areas of Mars are made up of something that lives and grows.” (Guide to Mars, Moore, 1960)

 

Jupiter

 

“… these disturbances may be volcanic … All this amid cliffs of permanent ice rising from a sea of temporarily liquid ammonia!” (The Conquest of Space, Ley and Bonestell, 1958)

 

Seen in the context of such fanciful ideas, a little scope like the Swift was, in 1964, a vehicle for fantasy and exploration in a way no telescope can be today. But can we get a sense of this from using the Swift fifty years on? Or is it, like so many classic scopes, so poor optically as to be all fantasy and no exploration?

 

At A Glance

Telescope

1964 Swift Model 838

Aperture

50 mm

Focal Length

700 mm

Focal Ratio

F 14

Length

700 mm

Weight

~6 Kg including mount

 

Design and Build

Optics

The Swift Model 838 has a 50mm (2 inch) air-spaced Fraunhofer achromatic objective of 700mm focal length ( F14 ). Given that F15 is generally the focal ratio used for much larger achromats, we can expect that the little Swift wouldn’t be troubled by false colour. I won’t pre-empt the test, but in practice the view through the Model 838 is as free from chromatic aberration as many ‘apochromats’.

The lens is held in place in a simple cell with a lock ring; collimation is fixed. The coatings are good quality single coatings and from what I can tell from the reflections, all surfaces are coated. The elements are separated by simple foil spacers like most small doublets.

In general then, the Swift’s lens is superficially no different from other small achromats of the day.

Tube

If the optics look like any other, the Swift OTA is unique. External build quality is very high: in a different class from say a Tasco of the time. Instead of being held together by push-fit and screws, both the objective cell and focuser attach by threads, as does the dew-shield. Everything is made from metal and the castings are of high quality.

Whether or not you like the trademark Swift finish, in two shades of coffee, it is thick, smooth and has endured extremely well.  The brochure proudly boasts ‘enamel finishes are triple coated and oven baked’. Whilst the OTA is gloss, the mount parts are crinkle-coated in a similar colour; so is the finder mount, which looks odd on the gloss tube, but is original. That crinkle coating is very period – I recall my father’s late Fifties typewriter was covered in it.

Focuser

Name plate, serial number and cast wheels – like a Takahashi?

The focuser is perhaps where the Swift departs most obviously from the run of the mill ‘60s Japanese refractor – it is beautifully designed and engineered. Everything about it, from the thick draw-tube chrome, to the accurately machined, wide cross-cut rack is of the highest quality pre-CNC could deliver. It is much closer to a Tele Vue or Takahashi focuser than to a Tasco. Those sculpted metal focuser knobs look like the pre-cursor to TeleVue’s ‘mag wheels’.

The focuser looks good, but it is also smooth, accurate and free from play or image shift. Shine a torch in the end and you can see that it’s baffled and flat-black painted too. The visual back is a twist ring like a Takahashi with no set screws and it too works very well; it is even inscribed with which direction to turn to tighten or loosen it. It’s a design that Baader have re-discovered with their ‘click-lock’ accessories.  If Swift were doing this in 1964, why do we still suffer the set-screw?

Swift focuser at full travel – an extension is never needed.

The draw-tube has a remarkably long travel. Why? Japanese observers like to use their refractors straight through and the Swift allows this without an extension tube.

On top of the focuser is a proudly embossed name plate with a serial number, again reminiscent of a Takahashi

The only down-side to the focuser is that it takes only 0.965 accessories.

Mount

The Swift mount, with its trademark teardrop weight, is also unique to the brand. It’s finished in the same dark-coffee crinkle as the finder ring.

The mount is a German equatorial, but has no motor or even slow-motion controls; arguably it doesn’t need them. The push-pull action of the axes is perfectly weighted and super-smooth with no backlash. Classy silver-on-black (Takahashi-like again?) setting circles are provided.

The mount sits on a tall, slim tripod with mahogany legs and an eyepiece tray.

The basic action of the mount is excellent – if only most modern alt-az mounts were this smooth. But it’s not flawless. One problem is the setup’s weight: so light that it’s easy to move the tripod when you push the mount axes around and the slightest nudge of a toe in the dark budges it enough to lose your position in the sky.

Of course that light weight makes the Model 838 perfect for grab-n-go, from a time before such a concept existed.

A slightly more serious problem is vibration. The OTA is light but long and focusing causes a lot of vibration that makes finding critical focus hard at higher powers. Again, a slight knock whilst viewing causes significant vibes.

Interestingly, Swift use exactly the same mount for the next model up in size – the 60mm Model 839 – and a friend who owned one tells me it is ‘very wobbly’ with the bigger OTA.

Finder

The finder is particularly good for an old scope and much better than most cheaper optical finders today. It’s labelled 5x24 and though the field is narrow compared to say a Takahashi 5x25, the view is bright and sharp. The objective is a coated achromat, mounted in a little cell, whilst the eyepiece has good eye relief. Internally, it’s been properly flat-black painted, so stray light is no problem and it hasn’t been stopped down unlike many finders of the era.

Accessories

The Swift comes in a quality wooden box with a range of accessories. Unusually, the accessories for the Swift are really good, so I’ll discuss them in detail. All are 0.965” fit and all feature the same twist-lock mechanism as the visual back.

The 20mm Huygenian eyepiece is optically quite decent, but it has little eye relief and a steeply conical top. In the dark, it’s all too easy to poke yourself in the eye with it – ouch!

The 9mm ‘Sym’ is effectively an Orthoscopic and it’s really quite good quality, given the same poke factor as the 20mm (my eye still hurts from last nights’ viewing). However, give the Swift a modern eyepiece, like my 7mm Takortho’, and it moves to another level.

A good quality 0.965” prism diagonal with a twist grip eyepiece holder comes with the Swift and like the eyepieces is in the same coffee livery as the OTA. Doubtless a modern multi-coated version would improve brightness a bit, but decent 0.965” diagonals are virtually unobtainable now; you’d need a 0.965”/1.25” adapter to use a larger diagonal.

Swift’s erecting prism threads on in place of the visual back, works very well.

Like many Japanese telescopes of the day, the Swift comes with an erecting prism. Unlike almost any other example I’ve seen, this one is a top quality item that introduces no aberrations at moderate powers and turns the Swift into a sharp daytime spotter. To use it, you unscrew the visual back and thread in the prism unit, making it an integral part of the scope and a big improvement over push-fit.

Like all the other accessories, the Swift barlow is a good one.

Finally, the Swift includes a barlow lens. Once again, it’s a different from the usual. Most barlow lenses I’ve seen included with older Japanese scopes are rubbish, so much so that bad experiences of Tasco’s barlows in the Seventies gave me a long-held prejudice against the things. Swift’s is an excellent device, though: metal bodied, clamp ringed (like all the accessories) and optically so good that introduces no significant aberrations and works really well.

Is it a Takahashi?

There is a theory going the rounds that Swifts are basically early Takahashis. But having owned or reviewed numerous Takahashis, I can categorically state that … I’m not sure.

The Swift undoubtedly has features in common with a typical Takahashi, including the look of the castings, the twist-lock visual back and diagonal, the clamshell and the design of the focuser. Certainly the overall quality is Takahashi-like. But whether these are just features that premium Japanese makers shared in common at one time, or whether they are evidence of a manufacturing or design link, I can’t say.

In Use – Daytime

My usual test of viewing tree branches against a bright sky at 100x magnification gives a dim but sharp view. False colour is present at about the level of a fast doublet APO (think TV-76), so is mainly seen out of focus and isn’t intrusive.

In Use – The Night Sky

The Swift cools very quickly and is a pleasure to use: the focuser is quite smooth, accurate and free from image shift. Best focus is a very definite point, a snap if you will, like all good optics.

For fun, I’ll quote the original Swift manual to see if the description for each Solar System target is accurate. Sometimes these quotes seem cryptic, strange or nonsensical – don’t blame me! The same Manual recommends making a ‘hat trick’ shutter for photography from ‘ordinary shit cardboard’!

The Moon

The Manual Says: ‘Approx. 5000 craters. Dia of minimum spot: 4.5 miles. Width of minimum crevice: 550 yds.’

A Day 27 crescent in pre-dawn  twilight with the standard H20 eyepiece gave good contrast and a very sharp image at 35x in stable seeing.

The little Swift holds up well at 100x with a modern 7mm Tak Orthoscopic, giving a slightly dim view that is completely crisp with surprising detail. As an example of the limits of its resolution, Rima Huygens is visible at first quarter, but the Hippalus rilles, at the boundary of Mare Humorum, are not.

Mercury

The Manual Says: ‘Disc image can be seen.’

Mercury is well-defined and obviously not a star, but the disc is still minute at 100x; Mercury’s phase is barely discernible.

Venus

The Manual Says: ‘Eclipse can be seen. Ordinarily appears as a crescent shape.’

Venus shows a well-defined gibbous disk and no native chromatic aberration (though lots from the atmosphere). Venus looked good, even low in poor seeing – perhaps due to the combination of small aperture and long focal length.

Mars

The Manual Says: ‘Polar cap and Lake Sirutis visible when near Earth.’ (!!)

Mars is visible as a tiny orange disk, but I have yet to see any detail through the Model 838, except perhaps the hint of a polar cap. I am still holding out for those promised views of Lake Sirutis though.

Jupiter

The Manual Says: ‘looks elliptical, 2 bands can be seen’

The little Swift excels on Jupiter, giving a  very crisp view with no chromatic aberration at 100x with 7mm Tak ortho’. Four belts, the polar hood and some detail in the Southern Equatorial Belt (dark spots) can be made out at that magnification. Contrast delivery seems excellent for the aperture.

Jupiter’s Galilean moons are clearly disks and I was able to watch a shadow transit with the Swift.

Saturn

The Manual Says: ’The ring can be seen. Satellites Titan and Rhea are also visible.’

At the time of the test, Saturn was still very small, but 100x again delivered a surprisingly good view for such a small telescope. The rings were clearly discernible as such (i.e. not as Galilean ‘handles’!), along with the ring shadow. I couldn’t make out the Cassini division, though.

Deep Sky

M42

The Orion Nebula looked quite good through the standard H20mm eyepiece, but a bit dim due to single coatings (on the eyepiece and prism diagonal, as well as the objective).

M13

A surprisingly good view was to be had of this bright globular cluster, but there was only the vaguest sense of resolved stars with averted vision.

Doubles

Castor easily split into two hard ‘balls’ with black space between. Epsilon Lyrae  – right on the Swift’s theoretical resolution limit - was resolved into ‘dumbbells’, but was  not cleanly split.

I was unable to split Rigel (B was lost in the diffraction rings).

M57

The Ring Nebula  was easy to pick out and showed as a smoke ring with averted vision, but like M42 was a bit dim.

Summary

The Swift Model 838 is a beautifully made instrument and is highly usable today, unlike many classic scopes that have poor optics. The only wonder is that Swift lavished so much care on a 50mm scope. Having said that, the little Model 838 is light and portable in a way that the bigger Swifts of that era aren’t. The mount is passable for the 50mm OTA: smooth and accurate, but a bit vibey.

A mere two inches aperture it may be, but the Swift’s optics are essentially perfect and virtually free of chromatic aberration, so it shows you more than you would expect, especially when it comes to the Moon and planets.  I think I can imagine the thrill the Model 838 must have given its original owner, peering at Mars and glimpsing the polar cap, whilst reading Moore’s original Guide to the Planets by a big chrome ‘60’s flashlight.

Unitron may be the more famous brand, but optically the Swift is far better than the 60mm Unitron I once owned. It’s both a travesty and an opportunity that classic Unitrons are so much more expensive than Swifts today.

Incidentally, the Swift’s optical quality is also better than my 1964 Questar.

It’s no coincidence that unlike many classic scopes, this particular Swift has been both well cared for and well used. Something about the Swift makes it easy to imagine oneself back to 1964 when using it: an indefinable Sixties character that I really like.

Given some of the dreadful telescopes made since, it’s chastening to realise how well a small refractor could be made fifty years ago, back when even some professional astronomers still believed in Martians.

It is only a 50mm scope after all, but as a usable and affordable classic, with top quality optics and mechanicals, the Swift Model 838 is highly recommended.