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09-14-2013, 02:04 AM   #1
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6x7 90-180 on 645D

Hi all,

does someone have experience using the 6x7 90-180mm on a 645D?
I own the 645 45-85 FA, and was owning the 80-160 A before. While the first zooms stopped to to f/8 or more is really close to the prime lenses in terms of sharpness, the 80-160 was a bit dissapointing at the borders, so I sold it.
Any chance the 6x7 Zoom is better? Would match nicely the 45-85mm as a tele zoom. And prices have come down, 700 to 800$ seems to be realistic.

09-14-2013, 07:09 AM   #2
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I have both 67 zooms and use them regularly on my 645D. They are both excellent lenses with fantastic build quality. In fact they strike me a collectors items just in terms of their build and physical appearance. I'm generally a landscape shooter so I use them mostly within the f8 - f32. For image quality the 55-100 is without a doubt the best zoom I've ever used, sharp throughout the entire range. The 90-180 is just a little softer, but still excellent. The 90 has an f45 stop but I've never been able to use it effectively--too much diffraction. Each lens has a 105mm front element which makes filters expensive and they are somewhat prone to flare, so I usually shield the front element from sun. I really like the color rendering of the lenses as well, which, compared with the new aero-brite coated lenses, is more subdued and slightly less vibrant, which I like. Prices for these lenses have been coming down, as you noted--I think they are great buys. All metal lenses like this will never be made again. Another thing to consider is their size and weight, which is considerable. You can find samples for each lens on my flickr site.

Keith
Flickr: klewish's Photostream
09-14-2013, 10:44 AM   #3
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That's interesting. As I am happy with the 45-85, and that one offers the 10mm less that are important on the 645D when you don't take a wider lens with you, the 55-100 is less interesting for me. 1.2kg, as the 90-180 has, isn't too bad, it is replacing two prime lenses. 105mm is some challange, off course, right now I only have 95mm and 122mm (unfortunately no Polarizer yet in 122mm).
Any chance to use it with a 95mm filter on the 645D? The sensor is much smaller than 6x7, so it might be possible?
09-14-2013, 12:05 PM   #4
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I have never tried using a 95mm filter on them. If you're stopping down the lens some, it might work. Someone else may know for sure.

09-20-2013, 06:26 AM   #5
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Well , according to the gear database, it has a 95mm filter, not 105mm, so there shouldn't be an issue at all.
09-25-2013, 01:47 PM   #6
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I own both zooms for the 67 and they use 95mm filters up front. The 90-180 is a great lens.
09-26-2013, 11:17 AM   #7
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I got one in the meanwhile. The good news is, it only needs one stop stopping down at the short end and the middle, to reach a really good level. At the long end, two stops are required to achieve this, that's still OK. It also works quite well using the 645 1.4x converter.
The bad news is, that it never reaches the level I am used by my prime lenses and the 45-85mm at f/8 to f/11. And further stopping down can't help, as beyond f/16 the pictures are getting softer with any lens on the 645D.
It somehow behaves like my 120/4 macro in case the object to take a photo of is really far away. It is not bad, really not, but it is lacking the high contrast, sparkling, finest details, the other lenses are offering.
09-27-2013, 11:00 AM   #8
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There are cases where a lens will do really great on a film camera but not so good when adapted to digital capture. This could be the case with the 90-180. Also, I have found that my 165LS and 200mm Pentax to be slightly sharper than the zoom. Not sure if that performance will translate to digital capture though.


Last edited by desertscape; 09-27-2013 at 11:06 AM.
09-27-2013, 11:27 AM   #9
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I haven't tried it on my 67II yet. Could replace my 105/2.4 and 200/4 there. Film is sometimes less critical. And the handling of the lens is great.
I Use the 67II for panorama photos, using a black 1:2 mask below the view finder 45/55/75/90-180 might be very nice to use, sometimes even skipping the 75mm.
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