TC Guide II 200/2.8 + 1.4X 1.7X 2X Tests

Great work. Someday I will get the Minolta 2X APO TC, but still not decided because I dont know if my 200G is HS or not(the seller told it was upgraded, but I dont know how to check)

Wich version would be more interesting, the I or II? I have heard the II version is very slow with non HS 200G

Regards

TC Guide Version II (Part 1 200mm & TCs):
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Any user of TC or potential user of TC will always want to know how good or bad is a particular TC when used with a particular lens before making their purchasing decision. In other words, how much quality loss will one get by adding a particular TC to a lens.

The short answer is from 5-10% loss to 20-30% quality lost depending on the following factor:

1) OEM Matched or Dedicated TC (between 5-10%)
Minolta APO, KM APO or Sony APO or Sigma EX

2) Pro series TC (Kenko Pro 300, Pro 300 DG or Tamron SP) (5-15%)
Image quality will always better than generic TC

3) 1.4X or 2X (5-10% vs 10-20%)
1.4X TC will always give better image quality than 2X

4) F stop being used (Wide open vs Stop down)
Shooting stop down will always yield better image quality than shooting wide open. This is especially critical for lens that has better performance at smaller aperture.

5) MC7 (7 Elements) vs MC4 (4 Elements)
7 Elements TC in most cases will give better image quality than 4 Elements version.

6) Prime vs Zoom
Using a prime lens in most cases will yield better image quality than zoom lens.

7) AF vs MF
If the TC and lens combination will not be able to AF < F4.5 for 1.4XTC or < F5.6 for 2X TC. How good/accurate can you MF the lens if the viewfinder is dim?

The above factors or combination of factors will directly affected the image quality.

Bottom Line:

- Use dedicated matched TC whenever possible.
- Use 1.4X if you do not need 2X
- Use Kenko Pro 300 (DG)/Tamron SP if this converter fits your lens
- Use a 7 Elements TC
- Stop down your lens if you have a regular TC and still want sharp results.

Anyone remember GIGO (Garbage in garbage out), this also applies to lens and TC combination. If you start with a fast sharp lens and use a dedicated/matched TC you will always get excellent image quality. If you start with a slow unsharp lens, even if you use the best TC, your results will not be very good.


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Part 1 200mm telephoto and teleconverters test results:

Minolta 200mm F2.8 APO is one of the sharpest lens in Minolta lineup, lets see the resulting image of using with different TCs

Minolta 200/2.8 APO G is tested with the following TCs:

1) Minolta APO 1.4X ver II
2) Minolta APO 2X ver II
3) Tamron SP 1.4X
4) Tamron SP 2X
5) Vivitar 1.4X
6) Vivitar 2X (MC7)
7) Promaster 1.7X
8) Kenko 2X (MC7)
9) Phoenix C/D 2X (MC7)

The last 2 sets of tests compare 200/2.8 + 2X TC vs a 400mm prime and a 100-400 Telephoto zoom at 400mm.

Minolta 200/2.8 APO + APO 2X vs
Sigma 400/5.6 APO TELEMACRO
Minolta 100-400 APO Tele Zoom
@ 400mm both wide open and @ F16

I'll let the pictures do the talking.

200mm original @ F2.8



200mm original image zoom to 140% @ F2.8, F8 and F16



1.4X TCs Compare Center @ F4


1.4X TCs Compare Edge @ F4


1.4X TCs Compare Center @ F11


1.4X TCs Compare Edge @ F11



200mm original image zoom to 200% @ F2.8, F8 and F16


2X TCs Compare Center @ F5.6


2X TC Compare Edge @ F5.6


2X TCs Compare Centre @ F16


2X TCs Compare Edge @ F16


1.7X & 2X Compare Center @F2.8 & F5.6


1.7X & 2X Compare Edge @F8 & F16


1.7X & 2X Compare Center @F8 & F16


1.7X & 2X Compare Edge @ F8 & F16


200 APO +2X APO TC vs Sigma 400 APO TELEMACRO vs 100-400 APO Centre Wide Open


200 APO + 2X APO TC vs Sigma 400 APO TELEMACRO vs 100-400 APO Edge Wide Open


200 APO + 2X APO TC vs Sigma 400 APO TELEMACRO vs 100-400 APO Center F16


200 APO + 2X APO TC vs Sigma 400 APO TELEMACRO vs 100-400 APO Edge F16


This guide will be updated with similar tests of prime and zooms. The next one will be 70-210/4 (Beercan). Stay tuned.

Comment or suggestion welcome.
eccl

Edited by eccl - 18 November 2007 at 04:17