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Some of my first photos with A6300

Started May 17, 2019 | Discussions thread
OP Hector1959 Forum Member • Posts: 50
Re: Some of my first photos with A6300

That' s exactly how you say.

My Close-up filter is Inon UCL-165M67. +6 diopter and 165 mm maximum focusing distance (from filter) So I have to put the lens as close or closer to be able to focus.

In your case with the dome 20mm does not seem to much of a difference but maybe you were in the critical point /line and camera was unable to focus. e.g. if your lens has a MFD of 35 cm, distance from sensor to dome is 24 cm (extension 70mm included), and virtual image is formed 10 cm in front of dome, total distance from sensor to v. image is 34 cm so lens can not focus. But, with the 90 mm, total distance would be 36 cm, so focus is possible. With the diopter the solution was by reducing the MFD

Here, there is a dome virtual image calculator that could be useful to understand how it works and see if certain lens is compatible with certain dome.

https://oceanity.com.au/tools/virtual-image-calculator/

Regards

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