Canon 1200mm+2XEFII+7D

Getting back to the OP's original question about reaching beyond the 3840mm why don't you just get the Canon 5200mm f14 lens and leave it at that. On a 7D the equivalent FOV would be 8320mm but you'd need a hell of a good light to use a 2x converter on it and get any decent shots. It can take shots up to 32 miles away so you probably wouldn't need a converter anyway.

Have a look here, http://blogg.stockholmviews.com/#post24 there's a link to an ebay listing but it's no longer available.
 
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Getting back to the OP I notice he disappeared when he realised how wrong he was!
 
Pah! If you're going to do effective focal lengths, telescopes are where it's at. Planetary imagers know all about long focal lengths..... ;)

This was shot at around 75m (yes, that's METRES!) EFL (1/4" CCD helps with the focal length multipliers!) on a 2.35m F10 telescope with a 3x focal length multiplier using a 1/4" CCD chip.


Jupiter with Ganymede transition Sep 2009 by arad85, on Flickr


Saturn 4th March 2010 by arad85, on Flickr
 
its a tad soft :lol:
 
Great astrophotography arad85 :thumbs:

Curious as to what scope/imager you were using?

My first (and only) attempt at astrophotography was done in 2004 with a lowly Meade ETX90 and LPI CCD.



Didn't realise I had both Io & Ganymede in the frame until after registering, processing & stacking the image I saw two 'dust spots' was curious and looked up the info for the date/time/location of the shot.

I might still have been trying to clean the dust from that damn sensor otherwise! :naughty:

-=Glyn=-
 
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EOS_JD said:
Getting back to the OP I notice he disappeared when he realised how wrong he was!
Click to expand...

Maybe, Jim, but I hope that he comes back. He's a young lad and keen...never a bad thing in my opinion.

Bob
 
GlynHugh said:
Great astrophotography arad85 :thumbs:

Curious as to what scope/imager you were using?
Click to expand...
Thanks - yours is pretty darned good from an ETX90. I was using a Philips SPC webcam for the Jupiter shot I think, mono DMK with filters for the Saturn one taken through a Celestron 9.25" SCT with a 2x Barlow (with the spacing, it turned it into a 3x barlow)

I gave up planetary when I realised I was looking over 2 miles of houses at the planets - so looking through a heat haze that was just silly (you should see the original videos!). That and the fact it's bloomin cold outside at night :lol:
 
Canon Bob said:
Maybe, Jim, but I hope that he comes back. He's a young lad and keen...never a bad thing in my opinion.

Bob
Click to expand...

I agree I hope so too Bob.
 
Sorry, haven't checked the forums in a couple of days.

I'm pretty sure the sensor design and anti-aliasing filters make it different don't they? You wouldn't get the same amount of sharpness from a FF crop as from a aps-c image?
 
The AA filter does affect sharpening, but most FF and Crop camera's have AA filters anyway. Nothing a little sharpening in PP won't fix anyway.
 
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