Category Archives: Review

Helicoid focusers – Hawk Factory M42-NEX

I have bought quite a few helicoid focusers for use with various lenses (M42 and enlarger lenses). I will post about each helicoid focuser I have separately, and then combine them together for future easy reference. The information will include the various dimensions of each helicoid and my impression of how each works. This first post will be about the Hawk Factory M42-Nex helicoid. Continue reading Helicoid focusers – Hawk Factory M42-NEX

Baader Herschel prism – UV solar imaging

I did do some UV solar imaging with the Baader Solar film previously. Unfortunately, the one Solar film I have is for solar viewing (not the photographic version), which does reduce the light passing through to the camera significantly. Hence I have had to use higher ISOs and slower speeds for imaging when using the Baader U. Hence I thought it would be good to try this again now that I have the Baader Herschel prism, to see if enough UV is passed through to the sensor. Continue reading Baader Herschel prism – UV solar imaging

Baader Herschel Prism – single vs double stacked Solar continuum

For this post, I would like to compare the difference in images between the use of a single Solar continuum and double-stacking. In my previous test, I did not find that much difference between those images with and without IR, hence I wanted to know if there was any benefit from using a double-stack of Baader Solar continuum (as I have two of these filters in 2″). Continue reading Baader Herschel Prism – single vs double stacked Solar continuum

Baader Herschel prism – Solar continuum with and without IR-cut

For this test, I have taken images with two different cameras. I have used the full-spectrum Olympus E-PL5 with the Baader Solar continuum and ND 3.0 filter for the images without IR-blocking, and the unmodded Olympus E-P5  with these two filters for the system with IR-cut. The question is whether there is any detectable difference between the images taken. Continue reading Baader Herschel prism РSolar continuum with and without IR-cut

Baader Herschel Prism – unboxing

I have been thinking of buying a Baader Herschel Prism for many years now, as this has been described as the best herschel prism available. My main interest with this would be for solar imaging, although it would be very good for solar viewing as well. Unfortunately the cost has always been fairly high, and it just never made it up the priority list. Continue reading Baader Herschel Prism – unboxing

Sony NEX-5N vs Olympus OM-D EM-5 UV imaging

In this post, I will be doing a side by side comparison of these two cameras, with regards to the cameras themselves, ease of use, functionality and image quality, as well as images from both cameras for comparison. I know that there are features in both cameras which I like, and it would be great to see them all amalgamated together into one camera (although this is unlikely to happen). Continue reading Sony NEX-5N vs Olympus OM-D EM-5 UV imaging