Teleconverter comparison (image heavy)
Posted 14/09/2010 - 19:57
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For me the oddest thing is if you look at the first two images of both the 300mm and 500mm the 1.7 appears closer than the 2x teleconverters. I have checked, they are in the correct order.
Davex
Davex
Posted 14/09/2010 - 20:59
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1.7x and 2.0x are just notional values and the TC's are from
different makers. I've already mentioned that in another thread today.
different makers. I've already mentioned that in another thread today.
Half Man... Half Pentax ... Half Cucumber
Pentax K-1 + K-5 and some other stuff
Algi
Pentax K-1 + K-5 and some other stuff
Algi
Posted 14/09/2010 - 21:47
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Quote:
The values are only nominal anyway. They refer to an unspecified
lens (probably 50mm) at an unspecified distance 1m or infinity..
who knows. Plus as you focus a telephoto closer it's focal length
becomes less and the 1.4x focal length will vary.
Indeed you have Algi, and valid comments. I feel a proper "scientific" test coming on, was wondering what to do this Saturday The values are only nominal anyway. They refer to an unspecified
lens (probably 50mm) at an unspecified distance 1m or infinity..
who knows. Plus as you focus a telephoto closer it's focal length
becomes less and the 1.4x focal length will vary.
Davex.
Posted 15/09/2010 - 08:53
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The 1.7x seems to be the clear winner, which isn't all that surprising as it's shorter than the others. A comparison with some 1.4x TCs would have been interesting
The 1.7x does not support SDM, by the way, although its screw drive is very fast compared to many lenses (including SDM ones).
The 1.7x does not support SDM, by the way, although its screw drive is very fast compared to many lenses (including SDM ones).
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
Flickr • Fluidr • PPG • Street • Portfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
Flickr • Fluidr • PPG • Street • Portfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
Posted 15/09/2010 - 09:18
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Quote:
I don't think thats a KAF convertor as there is no autofocus shaft
Well spotted Gareth, it is actually a KAX, must have been wishfull thinking on my part. But at least i got it right in the actual advert.I don't think thats a KAF convertor as there is no autofocus shaft
Quote:
A comparison with some 1.4x TCs would have been interesting
Would be happy to Tim, when you send me your Sigma 1.4x A comparison with some 1.4x TCs would have been interesting
Davex.
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1432 posts
17 years
Chester,
U.K.
The line up; Pentax 1.7 AF, teleplus 2x PZ-AF , teleplus mc7 2x KAF, teleplus 2x APk mc6,
All shots taken with DA 55-300 ZOOMED AT 300, on tripod ISO400, max aperture,in camera jpeg no PP, just resizing. Target was aprox 30 m away.
Order as above from left to right.
The following where taken with a Tamron 500mm mirror lens f8, same order as before
.
For those who are really interested, full size images here.
For those who are new;
Pentax 1.7 af, gives auto focus at most apertures, supports SDM. Will also af manual lenses within limits. Current price around £250
Teleplus 2x MC7 pz-af, gives af on af lenses up to 4.5 depending on contrast of subject, supports powerzoom, may support SDM (not sure on this one), Current price around £60
Teleplus 2x KAF mc7, manual focus only but does support “A”, current price around £20-£25
Teleplus 2x APK mc6, fully manual, current price £5-£10
Coincidently I have the Teleplus 2x KAF for sale here
Davex.
Please feel free to play with any images I post.
My flickr: link