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Anybody using MFT bodies for astrophotography?

Started Oct 8, 2016 | Discussions thread
Mark9473 Veteran Member • Posts: 6,428
Re: Anybody using MFT bodies for astrophotography?

Max Iso wrote:

For either of your telescope shots did you use a field flattener? One of the things i was told in the AP thread was i will NEED one.

Does that depend on the telescope, or the type (reflector vs refractor), is it only the cheapest scopes that need it? Is it only the fastest?

You do need a field flattener for a refractor, either built-in or as an add-on accessory, when you want to image star fields and such.

For the Moon, you will not need a flattener, because you're either only using the center part of the sensor (when it's a fast refractor) or when you're using more of the sensor it's because the scope has a longer focal length and then the field curvature is proportionally smaller.

Here's a link to an old lunar image I have in my gallery, taken with an F = 700mm refractor (without flattener) on an old 4/3 DSLR, significantly cropped of course.

https://www.dpreview.com/galleries/5120988127/photos/1999468/p3299787

I'm on a mobile device right now and can't access more recent images taken with that same refractor. But I've used it with a barlow lens (a focal length doubler) and didn't have any problems with field curvature with the Moon almost filling the frame.

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Mark

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