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MTF, and other data, for several 28mm MF lenses
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PostPosted: Thu Nov 22, 2012 1:34 pm    Post subject: MTF, and other data, for several 28mm MF lenses Reply with quote
[[Mods: If this information already has been posted to the forum, I sincerely apologize and please remove this thread]]

28mm prime lenses having the importance they do as we adapt MF lenses to digital cameras, I thought this might be of help to some participants here. Of special interest is the MTF data, not something I have prior seen presented so clearly. Here is a link to the opening page:

http://www.pbase.com/steephill/28mms

By clicking on the individual lenses you can bring up data for each.

For example, compare this average performing Osawa

http://www.pbase.com/steephill/image/38667687

to the slightly better rated Sigma

http://www.pbase.com/steephill/image/38667689

For anyone unfamiliar with MTF, here is an explanation:

http://encyclopedia.thefreedictionary.com/Modulation+Transfer+Function

Last edited by guardian on Thu Nov 22, 2012 1:53 pm; edited 2 times in total


PostPosted: Thu Nov 22, 2012 1:37 pm    Post subject: Reply with quote
This is useful. Cheers. Best two 28mm lenses I have found are the Konica Hexanon 3.5/28 and Minolta Rokkor-SG 3.5/28, both are older 7 element designs and better than the later 5 element types.

Worthy mention has to go to the Pentacon 2.8/28 too, it's one of the cheapest lenses you can buy but performs very well indeed.


PostPosted: Thu Nov 22, 2012 1:47 pm    Post subject: Reply with quote
iangreenhalgh1 wrote:
This is useful. Cheers. Best two 28mm lenses I have found are the Konica Hexanon 3.5/28 and Minolta Rokkor-SG 3.5/28, both are older 7 element designs and better than the later 5 element types.

Worthy mention has to go to the Pentacon 2.8/28 too, it's one of the cheapest lenses you can buy but performs very well indeed.


A weakness of the site I posted is that it does not contain data for MF lenses with short register distances, such as the splendid Hexanon 28mm. This is, I suspect, because the author is focused on lenses suitable for the Pentax cameras which are his principal interest.

Still, I hope the site might be helpful to some individuals.

ETA

Sorry for confusion. Links in OP have now been put right.


PostPosted: Thu Nov 22, 2012 2:00 pm    Post subject: Reply with quote
The author also finds difference between lenses: Tokina = Hoya and Hanimex = Makinon. Which is kind of funny.


PostPosted: Thu Nov 22, 2012 8:31 pm    Post subject: Reply with quote
Well, I also find differences between my Tokina RMC and my Hoya HMC even though they are supposed to be the same lens.

However, in this case Tokina is 7 elements in 6 groups, while Hoya is 7 elements in 7 groups, which raises even more questions.


PostPosted: Fri Nov 23, 2012 4:45 am    Post subject: Reply with quote
iangreenhalgh1 wrote:
This is useful. Cheers. Best two 28mm lenses I have found are the Konica Hexanon 3.5/28 and Minolta Rokkor-SG 3.5/28, both are older 7 element designs and better than the later 5 element types.

Worthy mention has to go to the Pentacon 2.8/28 too, it's one of the cheapest lenses you can buy but performs very well indeed.


Ian,

What do you think about the Leica Elmarit-R 28/2.8 compared in terms of performance wide-open, color rendition, etc with the Hexanon and Rokkor? Am i wrong or these two lenses you mention are both Minolta bayonet, and not usable with EOS cameras?

Thanks,

Renato
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