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07-13-2012, 12:42 PM   #1
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teleconverter for Pentax SMC DA* 55mm f/1.4

Would it be worth looking into a 2x teleconverter for this?

I dont have enough cash to get a fast zoom lens, so I thought If i can get this to go to 110 at 2.8 (if I did the math right) it may help get me by until I do have enough cashola.

As well, I have read some tc's give manual lenses auto focus ability, is that true?

I have a k200d


07-13-2012, 12:46 PM   #2
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Wouldnt use more then 1.4x tc because of the lost of quality.

Also there are no 2x tc i believe with the needed contacts.
There are i believe two 1.4x tc one from tamron and one from kenko(?) but i dont know the precise name of those.
07-13-2012, 12:47 PM   #3
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The AF adapter teleconverter is this one:
SMC Pentax-F 1.7x AF Adapter Reviews - Pentax K-mount Teleconverters and Adapters - Pentax Lens Reviews & Lens Database

All others won't AF with the DA* 55mm as it has a KAF3 mount, but Pentax claims that there's one in the works!

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07-13-2012, 02:13 PM   #4
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In addiiton of the previous posts, let me add two comments:

- a TC will degrade the IQ. Mating the DA*55mm with a TC is a pity IMHO.

= while you budget is limited, you could consider some tele prime lens. Some 2nd hand 90=100mm MF primes can be reolatively cheap and they can deliver good IQ. See the PF lens database.

Food for thoughts....

07-13-2012, 02:35 PM   #5
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thank you all!!!
07-13-2012, 02:50 PM   #6
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Well, whether is is good or bad to use the DA*55 together with a TC, I shall not say. I am not afraid of using quality TCs on quality primes, but I don't know the DA*55.

What I do know is that Anvh is right: the Kenko Pz-AF 1.5X Teleplus SHQ and the similar (identical?) Pz-AF 1.4X TC from Tamron will provide AF with the KAF3 mount lenses.

I have the Kenko and it works just fine - as far as autofocus is concerned in reasonable lightening conditions - on my DA 18-135mm lens with KAF3 mount. It has to be the Pz-AF type to work because it is the power-zoom contacts that are being used for the focusing mechanism.

On another note: This pair isn't a favorite combination of mine and the Kenko has skyrocketed in price over the last year, but that's another story......

EDIT: Quick and dirty test to prove my point:

This lttle doll - as shown first the complete frame as photographed with the DA 18-135mm and of course heavily downscaled - was shot in P-mode without and with the Kenko. Shown are 100% unedited crops - JPEG straight out of my K-5. Unfortunately, the focus point wasn't at the same spot in the two examples (it is lower down on the doll image without TC) but it illustrates my poin(s): AF works, and IQ degradation may not be that granted after all in each and every situation.
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Last edited by Stone G.; 07-13-2012 at 03:28 PM. Reason: Addition - Samples

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