Archive for the ‘Laowa Lens Mount Adapter (Canon EF – Fuji X)’ Category


October 11, 2022

I’m not as dumb as I look, you know. (I have a face for blogging, not vlogging.) But I am a little slow sometimes. For example, I was slow to make the connection between the size and shape of two lens adapters I own.

When I bought the Laowa 25mm f/2.8 2.5-5X Ultra Macro lens for Canon EOS cameras, I also bought a Laowa Lens Mount Adapter for Canon EF lenses to Fuji X Series cameras. I remember thinking the adapter is oddly shaped and wondered why it wasn’t designed to be shorter/thinner.

That was before I purchased the Fringer EF-FX Pro II lens mount adapter (Canon EF lenses – Fuji X Series cameras).

The following photo shows two Canon EF to Fujifilm X Series lens adapters: the Laowa EOS-FX (shown left); and the Fringer EF-FX Pro II (shown right).

Canon EF to Fujifilm X-Series lens adapters.

Notice the two lens adapters are the same diameter and thickness (26.3 mm): the former is due to the Canon EF mount (top) and Fujifilm X Mount (bottom); the latter is due to something called flange focal distance (FFD).

The 17.7 mm FFD of my Fujifilm X Series digital cameras combines with the 26.3 mm thickness of the lens adapters (shown above), resulting in an FFD of 44 mm — exactly the right FFD for Canon lenses to work properly on a Fujiflm X Series camera body!

The Backstory

The Laowa lens adapter is manual; the Fringer lens adapter is automatic. The former doesn’t feature electronic contacts that enable auto focus, etc.; the latter does.

Soon after I bought the Laowa lens adapter I used it to mount a Canon EF 100mm macro lens on my Fujifilm X-T3 camera. Although the adapter worked to connect the lens and camera, the experiment was a failure because the Canon macro lens doesn’t have a ring for setting aperture manually, and the Laowa lens adapter doesn’t have electronic contacts that enable a camera to set the aperture of the lens. Same problem with my Canon MP-E 65mm macro lens.

Enter the Fringer lens adapter.

Copyright © 2022 Walter Sanford. All rights reserved.

Laowa LED Ring Light for 25mm Ultra Macro Lens

October 9, 2020

I prefer artificial light from electronic flash units rather than continuous light sources such as LEDs. That being said, when the working distance between lens and subject is small, a lens-mounted LED ring light makes sense to use.

Minimum focusing distance versus working distance

The “minimum focusing distance” is the distance from the subject to the focal plane. The “working distance” is the distance from the front of the lens to the subject. For macro photography, usually the latter is more important than the former.

According to Venus Optics (Laowa), the minimum focusing distance for the “Laowa 25mm f/2.8 2.5-5x Ultra Macro lens” is 23.4 cm at 2.5x magnification and 17.3 cm at 5x. According to several Web sites, the working distance is 45 mm (4.5 cm) at 2.5x and 40 mm (4.0 cm) at 5x, or a range of working distances from ~1.8 to ~1.6 inches.

Adding one or more extension tubes reduces the working distance and increases magnification. For example, adding a Kenko 12mm extension tube reduced the working distance from 45 mm to ~30 mm at 2.5x.

And it’s worth noting that adding the Laowa “Canon EF lens to Fujifilm X mount camera adapter” to the lens further reduces the working distance — the adapter is ~26 mm wide, essentially equivalent to adding a 26mm extension tube. Combined with the 1.5x crop factor of Fujifilm X-Series cameras such as the X-T1 and X-T3, it’s no wonder the magnification of the lens is increased dramatically when used with select Fujifilm cameras!

Ultra Macro Lens

The first two photos, courtesy B&H Photo, show the version of the Laowa lens for Canon EF. For what it’s worth, f/4 is the “sweet spot” for this lens.

Product image courtesy B&H Photo.

Look closely at the front of the lens. Notice a “flange” (one of two) that is visible around the outer rim of the lens. Those flanges are used to mount the Laowa LED ring light on the lens.

Product image courtesy B&H Photo.

LED Ring Light

The next two photos, courtesy Allen’s Camera, show the Laowa LED ring light.

Product image courtesy Allen’s Camera.

The LED ring light ships with a USB power cable. A power source for the ring light is NOT INCLUDED. My next blog post will feature a discussion of the pros/cons of the power source solution I decided to use.

Product image courtesy Allen’s Camera.

LED mounted on lens

The last photo shows the Laowa LED Ring Light mounted on the Laowa Ultra Macro Lens that is mounted on my Canon 5D Mark II digital camera. The USB power cable is connected to the LED ring light but not connected to a power source. (Don’t mind the clutter in the background!)

Notice the face of the LED ring light extends ~5 mm beyond the front of the lens, thereby reducing the working distance by ~5 mm (~0.5 cm). Plan accordingly.

Laowa LED and 25mm Ultra Macro lens mounted on Canon 5D Mark II.

Related Resources

Copyright © 2020 Walter Sanford. All rights reserved.

Macromia illinoiensis exuvia (face-head) redux

May 22, 2020

A Swift River Cruiser dragonfly (Macromia illinoiensis) exuvia was collected, with permission from park staff, on 27 May 2017 along the Potomac River at Riverbend Park in Fairfax County, Virginia USA.

The preceding image shows the remnant ommatidia clearly.

From this viewpoint, it’s harder to see the prominent horn on the face that is a key field mark for larvae/exuviae in the Family Macromiidae (Cruisers). The base of the triangular horn is located above the labium (face mask), between the long, thin antennae; the apex of the triangle is pointed toward the viewer.

It’s easier to see the horn in the featured photo in my last blog post.

Tech Tips

The subject was photographed against a pure white background (255, 255, 255) using the “Meet Your Neighbours” (MYN) technique.

20 photos of the specimen were taken using 2.5x magnification at an aperture of f/4; in-camera focus peaking was used to highlight select areas in each photo. RAW FILE CONVERTER EX 3.0 was used to convert Fujifilm RAF files to TIFF files. Adobe Photoshop CC 2017 was used to create a focus-stacked composite image that was edited using Apple Aperture.

Copyright © 2020 Walter Sanford. All rights reserved.

Cobra Clubtail versus Midland Clubtail

April 20, 2020

Odonate exuviae from two species in Genus GomphurusCobra Clubtail (Gomphurus vastus) and Midland Clubtail (Gomphurus fraternus) — are nearly perfect body doubles, with the exception of one key field mark that can be used to differentiate the species.

Dorsal views

Lateral spines are located on abdominal segments six through nine (S6-S9) for both species.

10 JUN 2019 | Barron County, WI | Midland Clubtail exuvia (dorsal)

Ventral views

The overall shape of the prementum is similar for both species.

10 JUN 2019 | Barron County, WI | Midland Clubtail exuvia (ventral)

Prementum (ventral view)

The shape of the palpal lobes on the prementum is different for the two species, as shown in the following diagram on p. 15, Key to the species of genus GomphurusIdentification Keys to Northeastern Anisoptera Larvae, compiled by Ken Soltesz.

The following images are magnified approximately three and one-half times life size (~3.5x).

For both species, focus on the row of teeth along the right palpal lobe. Notice the strongly curved shape of the palpal lobe for Cobra Clubtail (shown above), in contrast with the gently arched shape of the palpal lobe for Midland Clubtail (shown below). Also notice the Cobra palpal lobe has fewer teeth than Midland.

10 JUN 2019 | Barron County, WI | Gomphurus fraternus (exuvia)


Adult Cobra Clubtail dragonflies are almost identical to Midland Clubtails too. Several field marks can be used to differentiate the two species. In my opinion, one field mark is the easiest to recognize where it really matters — in the field!

16 MAY 2016 | Riverbend Park | Cobra Clubtail (adult male)

Notice there aren’t any mid-dorsal marks on abdominal segments eight and nine (S8-S9) for Cobra Clubtail (shown above). In contrast, there is a small yellow triangle on abdominal segment eight (S8) for Midland Clubtail (shown below). This is true for males and females of both species.

Photo used with permission from Freda van den Broek.

Copyright © 2020 Walter Sanford. All rights reserved.

More Laowa 25mm Ultra Macro

March 20, 2020

The Laowa 25mm Ultra Macro lens is challenging to focus in low light — commentary common to all of the videos I cited in my last blog post (see “Related Resources”) that is consistent with my limited experience using the lens.

As an aid to focusing the camera on the subject, I added a Sunpak LED-160 Video Light to my “Meet Your Neighbours” technique studio photography rig. The bright continuous LED light enabled me to see the red focus peaking displayed by my camera for the first time!

25mm (2.5x magnification) | ISO 200 | f/5.6 | 1/180 s | 0 ev

Both photos featured in this post are “one-offs,” that is, not composite images. Although the depth of field is so shallow that a lot of the subject is out of focus, one look at these photos and I can tell the Laowa lens will work well for creating focus stacks.

25mm (2.5x magnification) | ISO 200 | f/8 | 1/180 s | 0 ev

Both photos are uncropped, full size images from an APS-C digital camera sensor. An aperture of either f/5.6 or f/8 is the “sweet spot” for this lens, according to the video reviews I watched.

The Backstory

The subject is a Common Green Darner dragonfly (Anax junius) exuvia collected by Mike Powell, my good friend and photowalking buddy. Although the exact date and location are unknown, we know the specimen was collected sometime during 2019 somewhere in Northern Virginia.

Copyright © 2020 Walter Sanford. All rights reserved.

Laowa 25mm f/2.8 2.5-5X Ultra Macro

March 18, 2020

The following photograph is among the first set of shots taken using my new Laowa 25mm f/2.8 2.5-5X Ultra Macro lens mounted on my Fujifilm X-T1 APS-C digital camera using the Laowa Lens Mount Adapter (Canon EF – Fuji X).

25mm (2.5x magnification) | ISO 200 | f/5.6 | 1/15 s | 0 ev

The lens is all manual all the time, so it doesn’t really matter that the adapter features no electronic contacts for the lens to communicate with the camera. The lens doesn’t have a focus ring — the user sets the aperture and magnification on the lens and moves the camera/lens rig back-and-forth until focus is achieved.

Among my first impressions, the lens is a “light hog” meaning it requires light and a lot of it for good exposure! Depth of field is extremely shallow, as expected. “One-off” photos like this one are a little disappointing — for best results this lens should be used to create focus stacked composite images.

By now you may be wondering “Why did you buy this Laowa lens?” The two-part answer is simple and straightforward: 1) For the modest price-point of approximately $400 I have a lens that increases the magnification possible using my Fujifilm cameras by a factor of five. 2) I bought the Laowa lens with a Canon mount, so it can be used with either my Canon- or Fujifilm camera bodies. The Laowa Ultra Macro lens/X-T1 kit is significantly smaller and lighter than my Canon MP-E 65mm macro lens/Canon EOS 5D Mark II.

I’m looking forward to further testing of the Laowa lens in the studio as well as in the field.

Related Resources (subject)

Tech Tips

This subject was photographed against a pure white background (255, 255, 255) using the “Meet Your Neighbours” (MYN) technique.

The power ratios for an array of four external flash units were as follows: Group A = 1/2 +0.3 (primary backlight); Group B = off (secondary backlight); Group C = 1/32 (subject, stage right); Group D = 1/32 (subject, stage left).

Related Resources (Laowa 25mm Ultra Macro lens)

Copyright © 2020 Walter Sanford. All rights reserved.

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