Astronomy is often a hobby of extremes – travelling to extreme’s for the darkest skies, pushing optical and camera equipment to the extremes in order to capture the faintest most distant worlds, and extremely cold winter nights for those perfectly clear and stable skies.

Recently I had the opportunity to test a bunch of X-Mount lenses for my Fuji X-E2 thanks to Camera Electronic in Perth. Having the lenses meant I wasn’t going to miss a clear night, even if it meant it was going o be a very cold one!

These were the lenses: XF 15mm F/2.8, XF 18mm F/2 and XF 18-55 F/2.8-4. They are shown together with my existing Samyang 12mm F/2 and Fuji XF-27mm pancake below.

Working with the three lenses on three different nights, and carrying my XE-2 around for the week mostly with the XF 15-55 F/2.8-4 attached, the following would be my summary of how the lenses performed:

• XF 14mm F/2.8. This lens was a pleasure to use. The focus ring is very nice and easy to control with fantatic feel, much more so than my XF-27mm or Samyang 12mm. The lens stops only very slightly past infinity (and does have a stop as opposed to my XF 27mm) so focusing for infinity was somewhat easier than some lenses, as distance from stop was quite easy to train my fingers to remember. Coma was significant in the far corners, but only the far extremes and to remove almost all coma you would crop to about 88% original frame. The lens has no issues with chromatic aberration or false colour that I could discern, and no issue with vignetting either. Of all the lenses this lens remains the sharpest in all corners, even though exhibiting coma.
  
  

  Fuji XF 14mm F/2.8 at F/2.8 bottom left crop

• XF 18mm F/2. This lens ended up being a bit of a nuisance to be honest. I found it difficult to manually focus on the stars, and whenever I was using it wondered why I wouldn’t just switch back to the more pleasing 18-55 (see notes below). Of course it is F/2 which makes it slightly faster, but that didn’t outweigh the usability issues I had with it. Coma is quite noticeable in the corners, with lager flare and a more distracting seagull and cross shapes than the 14mm. To remove most of the coma I found I needed to crop down to about 84% of original frame size. I think a large part of the manual focus difficulty came from the increased coma this lens exhibited. The motor movement of the lens was a bit jerky too. There is a some blue chromatic aberration but it is not a significant issue.
  
  

  Fuji XF 18mm F/2 at F/2 bottom left crop

• XF 18-55 F/2.8-4. This lense was my favorite of the three even though it was not perfect from the choma and edge sharpness perspective. The lens was easy to manually focus and exhibits relatively well control coma. In fact in 3 out of the 4 corners coma is almost non-existent (see first example below) and far better than the other lenses. What’s better, the coma which exists is of a more circular shape than the other lenses making it much less noticeable at normal viewing sizes. Cropping out the coma to a reasonable clean field leaves you with about 90% of the frame. Interestingly in all my testing almost all of the coma was in the top right of frame, with the rest of the image extremely clean. This made me wonder how a different copy of the same lens would behave (if there was an element not quite parallel in this particular lens). This lens exhibited the most softness at the corner, only in the top right. The lens autofocuses beautifully, has a great zoom range, is nice and compact for a zoom of this range, and overall a real pleasure to use. Zooming the lens in to F/4 the field is flawless with no coma, no chromatic aberration or false colour, no vignetting and no softening of the edges leaving only pinpoint stars across the field. Remember though at 55mm this lens is F/4 which is about as slow as you want to go for an astrophotography lens.
  
  

  Fuji XF 18-55 F/2.8-4 at F/2.8 bottom left crop – Check out that perfect field of stars!!!

  
  
  

  Fuji XF 18-55 F/2.8-4 at F/2.8 top right crop. Not so pretty in the top right, but you could work with that (for example using composition to reduce its impact).

• For comparison I will include a comparable test of my Samyang 12mm F/2. Comparing to the Fuji XF lenses above this lens does in the end still have less coma with limited chromatic aberration. Cropping out the noticeable coma in this lens still leaves you with 91% of the frame, and to be honest I mostly don’t bother doing any cropping. The coma exhibited by this lens is relatively unnoticeable because like the 18-55 F/2.8-4 it is quite tight and not great big spikes or seagulls (as shown in the XF 18mm F/2 and XF 14mm F/2.8). This lens is unique when it comes to manual focus however, in so much as the focus ring is extremely stiff which makes small tweaks of focus sometime tricky and is a little disconcerting when the lens rotates slightly on the lens mount due to the force exerted. The stiff focus is quite common with this lens (google and you will see many people asking about it). The advantage of the stiff focus is that you can to a greater extent “set and forget” the focus during a night of astrophotography because you are unlikely to knock it out.
  
  

  Samyang 12mm F/2 at F2 bottom left crop

  
  
  

  Samyang 12mm F/2 at F/2.8 top right crop

Testing notes:

• Sample images shown are 1000px x 800px crops from 100% sized images.
• All comments refer to the lenses being used at their fastest aperture. Stopped down all lenses improved their image quality significantly, but this is of little benefit to astrophotography where wide-open is key.
• Each lens was tested on the same nights.
• All images shown above are as-shot from in-camera JPG with no adjustments.
• Test field of view did vary between lenses due to the nature of needing to re-frame for focusing on bright stars, but needing a mix of bright and less bright stars for long exposure testing.
• Every lens performs different in different corners of the FOV, to varying degrees. As such the results vary depending on which corner you examine. I have provided the best cross section reasonable in a concise review.
• All lenses have pinpoint stars throughout the middle 1/2 the FOV.
• It is worth noting that astrophotography is a particularly harsh test for camera lenses. Ideally you want pinpoint stars across a wide field, and that is tricky to achieve with a lens. Lenses that are often rated very well for landscape and portrait photography fail at astrophotography. WIth this in mind, the comments here should only be considered for astrophotography use – it may be that the lenses perform very differently under other criteria. All the Fuji XF lenses tested here performed better than I have seen many other camera lenses perform, including some Canon L lenses for example.

So, what lens will I be buying for my Fuji XE-2 now then? Well the 18-55 F/2.8-4 is the lens I want. The lens was a joy to use for general terrestrial photography (street, landscape and portrait) as well as astrophotography. The top right corners is bad, but remainder of the field almost perfect to extremes. I would love to test a different copy of this lens as I suspect (hope) the top right is an anomaly of this particular lens. If I did not already have the 12mm Samyang and was a keen Fuji user looking for a wide angle, the 14mm is a nice lense and somewhat comparable to the 12mm however for the advantges of autofocus and better manual focus you would sacrafice some corner quality compared to the Samyang.

I hoped that the Samyang 12mm would be mothballed by the Fuji XF 14mm, as I like the idea of autofocus and softer manual focus for daytime use. However with the results above I will be sticking with my Samyang 12mm for wide angle situations for now, perhaps until I test the XF 16mm.

Thanks again to Camera Electronic for the loan of the Fuji XF lenses.

So what’s this about the cold then? Well, even in the mild temperatures of Perth (winter nights down to about -2c inthe hills at worst) it can be very cold doing astrophotogrpahy! Here I am out testing the lenses kitted out in my ski gear to keep warm! It makes a real difference to how long you can stay outside doing astrophotography when you are comfortably warm, I can tell you.

 

A favorite holiday spot of mine for the last 15 years has been Pemberton in the south-west of Western Australia. Back in the early 2000’s it was all about fungus, orchid and landscape photography which I sold at my local Kalamunda Markets, and in more recent years it has remained of interest to me for the landscape photography but also a respite from Astrophotography, enforced by the typically cloudy and rainy weather of the area.

On this occasion there was a string of clear nights! I managed to ignore the first, staying inside in the warmth with family, but the second night got me, and out I went driving around the Pemberton countryside in the middle of the night, as you do! (ps. The third I deemed was too moonlit and stayed with the fire inside!)

This photograph is a quick postcard from the trip, taken straight from the camera, though almost no processing on my iPad and posted online for your enjoyment. It is of the Dave Evans Bicentennial Tree in the Warren National Park. The tree was never used as a fire lookout but is made to give visitors the opportunity to climb such a tree (you can see the pegs used for climbing in this photograph). The stars above the tree include the Southern Cross (immediately right of the tree) and Eta Carina nebula, all part of our Milky Way galaxy spanning across the night sky. The tree is lit naturally by moonlight shining through the Karri forest.

I will share more astrophotography from the area soon.

Reminder that my next workshop is coming up – 28th & 29th May.

I run workshops, one-on-one and group on the subject of astrophotography. Here are some photographs from one visit to my local spot, Lake Leschenaultia. Taken in February 2016. Living just around the corner from the lake I have a nice record of nightscapes at he lake from 2008.

I didn’t have the time to travel far for the Geminid’s Meteor Shower this year, resorting to setting up my camera in my backyard, after returning from an event at the Perth Observatory no less! I left the camera going overnight, stopping at 01:20am due to a full memory card (to be expected – get what you can!).

I’m very pleased with the result from my somewhat last minute and casual attempt at the Geminid’s – 29 frames containing a meteor (one of them containing two) and a reasonably pleasing landscape setting and composition.

The complete image is created by combining all meteors from the 29 frames in to one image. As such, over the 4 hour period the sky moved however the constellations/stars are shown from only the first frame. As a result, the meteors don’t appear to come as concentrically from the Gemini radiant as you might expect.

The intrepid Aussie comet hunter, Terry Lovejoy has done it again by finding another spectacular comet. His C/2011 W3 (Lovejoy) comet turned in to an amazing naked eye comet in 2012, will this one do similar? At the moment Q2 is only showing a hairline tail visible in photographs even though it’s nucleus is very bright.

The image above is a photograph I took of comet C/2014 Q2 (Lovejoy) on the 17th December 2014. It’s a colour image from my 6D DSLR, a series of 10 exposures each 3 minutes in length at 2500ISO.

The new comet C/2014 Q2 (Lovejoy) is currently naked eye visible, at about magnitude 5.9. It is currently located almost directly between the bright stars Sirius and Canopus, putting it in a perfect position for viewing and photography throughout the night (in the southern hemisphere at least). The below image shows where you can find it on the 17th December 2014 at 9:30pm AWST: