March 8, 2016

Hejnar PHOTO MS5P 8" Linear Motion Lead Screw Macro Rail Preview

Hejnar Photo MS5P_8 Linear Motion Lead Screw Macro Rail
It's not long since the release of the Hejnar Photo MS-5 8" Linear Motion Lead Screw Macro Rail last August, but it is well known by now that Chris Hejnar never stops improving and simplifying a product when possible.

So last month a new iteration of the Hejnar MS5_8 macro rail has been announced.
That is the MS5P_8 Arca-Swiss® compatible Linear Motion focusing macro rail.

Obviously as its name denotes it's still an 8" focusing stage, introduced as a direct upgrade of the original MS5_8 with an added "P" at the end of the model name. This "P" now, denotes a push button release mechanism coming from the earlier MS-3_8 Linear Motion Macro Focusing Stage (review) instread of the brass slider release lever of the MS5_8.

Otherwise, the MS5P_8 features the same lead screw offering 1.06 mm travel (0.0417") per one rotation of the knob(s) with a maximum travel distance of 3.5 inch (89 mm).

However, the changes on the slider release mechanism resulted in a simpler product with less components, lighter by 90 gr and cheaper by US$ 50.00. Not bad, really!

The Rail structure

Manufacturer Specification:
Model:MS5P_8
Rail Length:203 mm (8")
Overall length:267 mm (10.5")
Width:95,25 mm (3.75")
Height (Thickness):45,72 mm (1.8") w/o QR clamp
71.7 mm (2.825") with F63b QR clamp
Weight:911 gr (2.0 lbs)
Materials:Precision C.N.C. machined 6061-T6 Aluminium,
Black hard coat anodized, Stainless Steel and
Self Aligning Linear Sleeve Bearings (slider).
Hardware:Stainless Steel
Made in:U.S.A.

Same as all the latest Hejnar Macro stages the outer shell is aluminum with a 0.002" thick ceramic coating for added corrosion resistance and endurance at a temperature range of –400° F to +375° F (-240° C to +190° C ).

Hejnar Photo MS5P_8 front top overview
Although both 8" long, the MS5P_8 maintains the structure of the MS5_8 in width than the MS3 enhancing its strength and stability characteristics while it comes with the wide F63b QR clamp by default. The lead screw is driven by two large knobs one at each end of the screw, providing access from both sides.
Hejnar Photo MS5P_8 slider release push button detail
Fast positioning of the slider is effected now by pressing the chrome slider release push button shown above, just under the carriage. 
Hejnar Photo MS5P_8 Linear Sleeve Bearing detail
The MS5P_8 follows the same design as the MS5_8 but also the Micrometric MS4_8 and 10. It features Self Aligning Linear Sleeve Bearings. Having a nonabrasive, chemical-resistant PTFE liner they don't require any additional lubrication, consisting them virtually maintenance free.



The F63b Quick Release Clamp

Manufacturer Specification:
Model:F63b
Jaw Length:3.25" (82 mm)
Weight:135 gr (4.7 oz)
Countersunk/threaded holes:Three (1 x 3/8"-16 center hole and
2 x 1/4"-20 outside 45 mm apart)
Safety Stop Relief Grooves:Two
Long Captive Screw Knob:Stops at maximum opening
Material:Precision C.N.C. machined 6061-T6 Aluminium
Color:Black hard coat anodized
Hardware:Stainless Steel
Made in :USA

We have come across the Hejnar F63b QR clamp quite many times recently. It is compatible with virtually any Arca style Quick Release plate. Since it is not integrated into the slider, it can be dismounted and mounted in any orientation, but also used on a ball head or other equipment at will.

Hejnar Photo MS5P_8 with F63b QR Clamp
The slider is equipped with the larger Hejnar Photo F63b 3.25" (82mm) long Arca Swiss® compatible Quick Release clamp, which sports two extra mounting / alignment screws within the safety relief grooves. (b at the end of the model name stands for long black knob).
In the picture above the clamp is attached on the slider by one 1/4"-20 flat head screw through its center hole. Two M4 flat head screws can be used as alignment screws on the sides of the center screw at any orientation. All screws can be easily loosened by the included Allen hex keys in order to be reoriented at users will, in 90° increments, so as to place the clamp jaws either parallel or perpendicular to the slider and the protruding srew-knob at any side the user finds more convenient.
When the clamp is mounted perpendicularly to the slider, then the large clamp area becomes a convenient wide platform for lateral adjustment of the camera within the clamp.

The Arca Dovetail
When the MS5P_8 Linear Motion lead screw adjusting macro rail is mounted on a Tripod Head equipped with an Arca-Swiss® compatible clamp, the camera to subject distance can be adjusted by moving the whole stage within the ball head clamp limits via its bottom Rail and further engage in extra-fine adjustments using the lead screw knobs.

Hejnar Photo MS5P_8 Bottom view
The bottom rail is equipped with an Arca Swiss® compatible dovetail, so it can be used with any head equipped with an Arca compatible clamp while an 1/4"-20 threaded center hole on the brace in the center of the rail, allows for direct mounting on a pod with a similar 1/4"-20 stud.
Hejnar Photo MS5P_8 Safety stop screw detail
The MS5P_8 comes with M3 safety stop screws pre-installed at both ends of the bottom rail, thus not allowing the large stage to fall off from a loosely tightened quick release clamp.

The MS5P_8 rail, is not different than the other Hajnar Macro Stages, which can operate in vertical orientation (perpendicular to the ground) with a load up to 10 lb (4,53 kg), while in horizontal orientation (parallel to the ground) the load can be increased up to 15 lb (6,80 kg).

Compatibility
Standard Hejnar choice of materials, manufacturing quality, fine adjustment and last but not least, Arca Swiss® compatibility bring this Linear Focusing stage to the top choices.
Arca-Swiss® compatible dovetails from Hejnar Photo work with Arca type clamps from:
  • Markins® including lever release clamp
  • Really Right Stuff®, including lever release clamp.
  • Arca Swiss®
  • Wimberley®
  • Kirk®
  • Photo Clam®
  • Foba® (Foba uses different safety stop mechanism, so safety stops may need removing)
  • Vanguard ABH Series Ball Heads (ABH is Vangaurds only Arca-Compatible series)
  • Custom Brackets®
  • Jobu Design®
  • Acratech®
I hope you found the article useful, thank you for viewing.
All Photos used by permission: © 2016 Chris Hejnar / Hejnar PHOTO

Price & Availability:
Current price for the MS5P_8 Lead Screw Macro rail is US$ 375.00 (+Shipping where applicable) and is available from the Hejnar Photo online Store.

If you are interested in the product, do check the Recommended Sellers page for the current valid Hejnar Photo discount coupon.

Relevant Articles:
Innovative Linear Motion MS5 DS4 Macro Rail with Digital Scale from Hejnar PHOTO Preview
MS-5 8" Linear Motion Lead Screw Macro Rail from Hejnar PHOTO Preview
Two New 50 mm Linear Motion Lead Screw Macro Rails from Hejnar PHOTO
New Hejnar PHOTO Linear Motion Micrometer Macro / Micro Rail
New 50mm Linear Motion Micrometer Macro / Micro Rail from Hejnar PHOTO
Hejnar PHOTO MS-3_8 Linear Motion Macro Focusing Stage Review

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