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| Pentax SLR Lens Discussion Discuss any Pentax K-mount, screwmount, or medium format SLR lens, as well as filters and attachments. |
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| 09-29-2009, 10:27 AM | #31 |
| Pentaxian | That BW with runners have a very nice tonality! I've been drolling over some Yashica, and Contax lenses that should be "adaptable", just waiting for a chance to grap some for a low enough price. About the Hexanon lenses and macro applications: Since it is so easy to make a adapter/tube with a K mount on the camera side and a AR mount on the lens side...you don't need to get the 55mm macro (even if that is a very nice lens and to my oppinion better than both the Takumar/Pentax 50/4 macro's and the micro-Nikkor 50 I worked with during my military service), but you can grap more common lenses extremely sheap: -Hexanon AR 50/1.7 (the most common normal lens for many years, there is a 1.8 also which is OK, but not as good as the 1.7, this lens is comparable to the SMC Pentax-M or A 50/1.7) -Hexanon AR 28/3.5 (the SMC Pentax 28/3.5 is sharper, but the Hexanon is not far behind...it is better than the M 28/3.5) - this one makes an excellent macro lens in reverse position on a tube or bellows...and this lens is actually more common than any of the Hexanon 50's, 52's, 57's, and 58's (yes they made many normal lenses), because there were not that many 28 versions (a rare 28/2 also), so they goes for almost nothing. -Hexanon AR 40/1.8 (the sharpest pancake 40 there ever was...yes I have the SMC Pentax-M 40/2.8 pancake also, and I recon that if the DA40ltd migth be slightly improved, it wont beat the Hexanon 40/1.8 which is sharp all the way from the start...and was really sold as the normal lens on all Konica cameras for almost a decade, after the 50/1.7, so they are plentyfull and dirt sheap...the 4/3rd people hack them now to get sheap 80mm/1.8 equivalents) I'll try to shoot something macro with each of these lenses for this thread. Many of the Hexanon lenses were produced in a time when Pentax took most of the top positions in lens tests due to the advantage they had with the SMC before other lens builders developed their own (almost) as good multi-coatings...but looking in lens ratings from the 70's you will find that right behind Pentax/Takumar is not Canon, Nikon or even Leica, but the Konica Hexanons. Such a pity they stopped building SLRs and went into that useless merge with Minolta. |
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| 10-01-2009, 01:59 PM | #32 |
| Senior Member | I have been making slow but steady progress adapting my Illford Monobar to take the DSLR body. Not wanting to do anything permanent to it I have started making a whole new rear standard for the digital camera so that it rotates round the centre of the sensor; no re-focussing (at least not much hopefully) between swing / tilt adjustments. I was thinking of making the camera mount a T mount as it will then take any film / digital SLR without further alterations. This may get put to one side for a bit now though as I have just obtained a Zuiko 35mm f/2.8 shift lens for conversion so can try some perspective controle quite quickly and easily easily with this. The Contax Zeiss macro conversion has proved highly worthwhile, although I removed the A pin and have been using it as an M lens. This lens has a bit of element separation in the rear lens group but it it still sharper and more contrasty in most situations that almost anything else I have. I got a quite to hae it fized but at $300 I can't justify it at the moment. A couple of recent shots with it are shown bellow. Arachnophobia sufferers look away now!  User Photo Gallery - Macro  User Photo Gallery - Macro |
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| 10-11-2009, 10:49 AM | #33 |
| Senior Member | When i'm trying to figure out if a lens can be converted to K mount the first thing to check is the flange focal / registration distance. So far I have always used wikipedia which has a reasonably comprehensive list (Lens mount - Wikipedia, the free encyclopedia) but there are definately a few mounts missing. However I just found a more comprehensive list here: mounts.htm I hope everyone else finds this as usefull as I have. |
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| 10-11-2009, 11:16 AM | #34 |
| Pentaxian | Originally Posted by MattGunn That's an impressive spider-shot!
Do you have a pic of the lens? Originally Posted by MattGunn That's a good link, had it among my bookmarks also, but thanks for posting.
There are sets for converting Topcon lenses to m42 mount on ebay (despite that the registration distance is shorter). From m42 it will be easy to go to K mount. Have anyone here tried them? Next question. Exakta bayonett is the same as the Topcon bayonett, right? But the reason why the Topcon converstion appears to work is that the bayonett piece is the same size on all lenses (?), but on the very many Exakta lenses there appear to be a lot of variation on how the bayonett part looks like (thickness, screws etc). Have anyone used the Topcon conversion set for an Exakta lens? Or converted an Exakta to m42 or K mount in another way? |
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| 10-12-2009, 05:31 AM | #35 |
| Senior Member | Originally Posted by Douglas_of_Sweden Thanks, I am very pleased with the second one, this lens is impressively sharp.
The contax macro is anything but "macro" - it it huge for a 60mm lens. Bellow are a couple of pictures showing it in focussed to infinity and at closest focus, with a Super Tackumar 50mm f/1.4 for an idea of scale. The last picture shows the separation of the rear doublet  . In spite of this it workes well, especially stopped down as it always is for macro shots. Wide open the contrast suffers a bit but it is still very sharp.Last edited by MattGunn; 10-12-2009 at 12:16 PM. |
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