The Sony A7R is an exceptional camera, with 36 megapixels packed into a full-frame sensor – I was looking at that sensor yesterday when taking it off the bellows, and boy does it look big compared to the Olymus EM-5 sensor. What better partner for the A7R than the Coastal Optics 60mm F4 APO.
Let’s face it. The Coastal Optics 60mm lens is a specialised lens meant for shooting macro – portrait and landscapes are not what you buy this lens for – but that is not to say that it can’t be used for that though. For the purposes of this review, I will concentrate on imaging in the visible light spectrum (macro). For its ultraviolet imaging capabilities, please look up my other threads on this website.
The following image is to show the ‘hotspot’ issue with the Coastal Optics 60mm F4 when close focusing. This happens when the lens focusing is adjusted to 1:3 or closer; this happens even with the use of my bellows.
I had stumbled onto the answer to the hotspot issue a while ago, as this phenomenon can occur with my Baader U and IDS1 (both 49mm filters) but not my IDS2 filter. The reason for this is that my IDS2 filter is a 25.5mm filter which I had adapted to 49mm to fit onto my Xume adapter. Hence it was acting as a narrow-angled lens hood.
The question I had was whether such a narrow-angled ‘lens hood’ would cause vignetting with the Sony A7R when focusing that close (this is not an issue with the Micro 4/3rds sensor)? From what I can see, at F8 this is not an issue with full-frame, although for larger apertures it will need to be a little larger – I will need to experiment with this a little more.