Tests of Haoda MF/AF Adapter

Thanks for sharing this, think many Dyxumers will find it helpful!

Pete,
In the test I ran, the Haoda converter, while not 1:1, produced somewhat less magnification then the generic converter. You seem to imply that both the generic and the Haoda offer the same magnification. Am I reading this correctly?

Thanks,

Keith

Pete,
Here is what I am talking about.

50mm 5.6 AF



50mm 5.6 MD with Generic 7000/9000 Converter




50mm 5.6 MD with Haoda Converter




The camera was not moved and was on a tripod. Please note that while both converters showed change in field of view the Haoda showed less.

Thanks,

Keith

Keith, there is NO difference in magnification between those last two shots above. The only difference is that the view is slightly shifted to the left in the bottom one.

By the way, do you remember this challenge?

http://tech.groups.yahoo.com/group/Minolta/message/136656

I was right! ;)

Edited by sybersitizen - 10 April 2007 at 05:06

I still think that "frisse erwtensoep" is a contradiction in terms...
("frisse erwtensoep"="fresh (in the meaning like "fresh mints") Split Pea Soup)

but that besides, i can conclude that it looks like Haoda's adaptor has no additional value/better features then a decent "old generic" adaptor and certainly not has a smaller crop factor.
And that you just might consider it because it's well tested by dyxum members and considerd rather "decent" ;)

sybersitizen wrote: Keith, there is NO difference in magnification between those last two shots above. The only difference is that the view is slightly shifted to the left in the bottom one. By the way, do you remember this challenge? http://tech.groups.yahoo.com/group/Minolta/message/136656 I was right! ;)

Yes, I do agree with Pete that the crop factor difference is minimal to non-existent, however, if you look at my original test on Dyxum you will find that on wide open, the Haoda had an advantage. I have questioned Haoda, he does respond and he does answer questons. My knowledge of the physics of a lens is insufficient to question what makes one different than the other, but I will pose the question to him for his response.

Keith

BobJanesSE2 wrote: Pete, Do you note any difference in contrast when the lens is used wide open with the adapter, rather than when it is closed down? The plate pics suggest that there is a slight drop off in contrast... were these taken full open? Bob

Hi Bob:

The ones with the plate and barometer were all shot at f/8. The lack of contrast is sensor flare from very strong exterior light on either side of the wall. There is a test in the gallery with the charts on the wall and that was shot wide open at f/1.2. There is considerable light fall off from vignetting with the small elements these adapters have and the large rear element of the 58mm Rokkor as well as a general lack of contrast. This does improve with stopping down the lens. But if you look at the thumbnails of the bridge, you can just barely see an almost identical reduction of contrast in the center with both adapters and these were shot at f/8 with the Rokkor 45mm.

Pete

Edited by Pete Ganzel - 11 April 2007 at 02:06