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August 27, 2016: Converting My Sigma 18-50mm f/2.8 Macro HSM To A Fisheye Lens

Converting My Sigma 18-50mm f/2.8 Macro HSM To A Fisheye Lens
Converting My Sigma 18-50mm f/2.8 Macro HSM To A Fisheye Lens





August 27, 2016 (Saturday).


I like experimenting and tinkering with little gadgets since I was a little kid. Now I've been experimenting on lenses for a while now and 'many' have been successful. It's a fun thing to do when you have an idea or a curiosity and you can experiment or create a testable hypothesis for it.

About my Sigma 18-50mm f/2.8 Macro (click here for the photo album)... it's a nice zoom lens with fixed aperture. What I hate it and modern lenses for are the ridiculous sharpness and contrast. That's why I was also looking for a 72mm Soft Filter. (The set I bought online was worthless trash that didn't do anything!)

August 27, 2016: Making a Super Sharp Fisheye Lens Out of My Sigma 18-50mm f/2.8 Macro



My goal for today's experiment was to remove the lens coating through a set of battery tests. However, it took a different direction when I removed the front glass and checked if the lens could make any image without it. (Technical Note: It's not always possible with other lenses. For example, the others become 'blind' and can't produce any image when the front element is removed.)

As for removing the coat... it's a tougher job than I thought. In the meantime, here's my first sample with this new 'fisheye lens'.

It's really useful as a fisheye lens since it's sharp and has minimal aberrations from corner to corner vs attaching a fisheye adapter to the front filter of your lens. I hope to further test this new fisheye lens of mine in the coming days. Thanks for reading my journal!

August 27, 2016: Making a Super Sharp Fisheye Lens Out of My Sigma 18-50mm f/2.8 Macro
Sigma 18-50mm f/2.8 Macro converted to a fisheye lens.

August 27, 2016: Making a Super Sharp Fisheye Lens Out of My Sigma 18-50mm f/2.8 Macro
Nikkor-S 50mm f/1.4 + 0.21x Fisheye Adapter (@ f/22)



Before conversion

Converting My Sigma 18-50mm f/2.8 Macro HSM To A Fisheye Lens


After conversion

Converting My Sigma 18-50mm f/2.8 Macro HSM To A Fisheye Lens




The last samples below are before conversion. No edit/filter.

August 27, 2016: Making a Super Sharp Fisheye Lens Out of My Sigma 18-50mm f/2.8 Macro
18mm

August 27, 2016: Making a Super Sharp Fisheye Lens Out of My Sigma 18-50mm f/2.8 Macro
50mm

August 27, 2016: Making a Super Sharp Fisheye Lens Out of My Sigma 18-50mm f/2.8 Macro
50mm

August 27, 2016: Making a Super Sharp Fisheye Lens Out of My Sigma 18-50mm f/2.8 Macro
50mm




UPDATE: The following day, August 28 (Sunday)... I went to Trinoma and had the chance to take a few shots with this lens. Focusing to infinity wasn't problematic and so is shooting indoor, but for outdoor shots purple fringing was prominent.

Sigma 18-50mm f/2.8 Macro

Sigma 18-50mm f/2.8 Macro




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