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How should I resolve my birding GAS?

Started 5 months ago | Polls thread
nnowak Veteran Member • Posts: 9,074
Re: How should I resolve my birding GAS?

User1303423862 wrote:

My lovely new EF 70-300 IS II USM lens has arrived.

I've been over to the local duck pond to grab a couple of test shots with Larry's handmade 2X TC at shorter and longer FLs and higher and lower ISOs.

Looking pretty good, though not quite as good as the TC along with the 55-250 lens Larry originally calibrated it to. I'm going to have to roll up my sleeves and try to make one specifically for this lens I think. I already have a Kiron optics 2X in Minolta mount I won off ebay for £4. Now I need a 36mm EF extension tube...

Why do you need to handmake a teleconverter when there are plenty of third party EF options on the market that will directly mount to your EF 70-300mm with no modifications? A very quick search on eBay turned up several options under $50.

Anyway, here are a couple of OOC JPGs.

These look pretty soft and low in contrast with color fringing on the edges of highlights. It would be interesting to see similar shots without the teleconverter in place since these sample were only at 94mm and 200mm respectively. I would be willing to bet that 200mm plus the 2X converter will look worse than a photo at 300mm and cropped to 4500 X 3000 for the same equivalent field of view.

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