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View Full Version : How To Turn Your 70-300mm Into A 1500mm Super Telephoto

Broadway53
26th of May 2008 (Mon), 10:14
I'm hesitant to post this because the purists will eat me alive but I was playing around with my 40D today and figured out that I can turn my 70-300 into a 1500 lens! Before buying the 40D I had a Canon S3 and loved it. I had purchased a Raynox 2020 to power up the telephoto capability to about 950mm and it worked real well. Anyway, today I attached a Kenko 1.4 TC to the 40D and mounted the 70-300. With the 1.6 crop factor the camera and lens are actually 480mm...multiply by 1.4 and now you're at 672mm. Add the Raynox 2020 (another multiplier of 2.2) and you get 1478mm! I know this sounds crazy but I was able to hand hold the camera (the lens length is embarrassing) and get a shot of a house more than a block away and read the numbers above the door! I'm going to Yellowstone in September and was concerned about reaching the long distance wolf and grizzly shots but not anymore! (NOTE: If you don't add the Kenko 1.4 TC the 40D will actually Autofocus when the Raynox 2020 is attached. Unbelieveable!)
anshu
26th of May 2008 (Mon), 11:25
example shots, and shots of the camera setup??
ooo
26th of May 2008 (Mon), 13:24
I would love to see the IQ differences.
Ralph Merlino
26th of May 2008 (Mon), 13:35
I can only guess what the quality is going to look like.
rdc640
26th of May 2008 (Mon), 14:29
TTIUWOP
PacAce
26th of May 2008 (Mon), 14:35
TTIUWOP

WAYTA?
Canon Soldier
26th of May 2008 (Mon), 14:36
can we get some examples please?!?!
Molnies
26th of May 2008 (Mon), 14:38
WAYTA?
This Thread Is Useless WithOut Pictures

Yeah, we definitely want to see some photos since I doubt the quality is anything but below acceptable.
PacAce
26th of May 2008 (Mon), 14:50
This Thread Is Useless WithOut Pictures

Yeah, we definitely want to see some photos since I doubt the quality is anything but below acceptable.

Thanks. I'm more used to seeing an emoticons holding up a signs saying that, like this:. :lol:

http://www.curevents.com/vb/images/smilies/worth.gif.
ooo
26th of May 2008 (Mon), 17:52
This Thread Is Useless WithOut Pictures

Yeah, we definitely want to see some photos since I doubt the quality is anything but below acceptable.

I'm sure 300mm with teleconverters would be better than a 300mm lens zoomed in 3x.
Rellik
26th of May 2008 (Mon), 18:06
How many stops of light did you lose? You're at least at f/8 by now?
ugly_a
26th of May 2008 (Mon), 18:10
How does this compare to the Opteka's 1300mm lens? :)
rdc640
26th of May 2008 (Mon), 18:30
How many stops of light did you lose? You're at least at f/8 by now?

5.6 lens... TC... f8.... raynox.... 2 stops at a guess?

f16 im guessing!!!
ben_r_
26th of May 2008 (Mon), 20:29
How does this raynox thing attach exactly? Is it just screwed into the filter threading? Wow.

http://ecx.images-amazon.com/images/I/31itgPVBkeL._SL500_AA280_.jpg