Is your adapter which allows auto focus or it is manual focus only. Put camera in manual focus and move the focussing ring. Since you mentioned FD lenses, not EF lenses, could that be an issue?
rdeloe wrote:
Bobby, you don't really need any mechanical knowledge to get up and running. The Fotodiox Tilt-ROKR P645 to GFX adapter works right out of the box. That link I sent you to my "hacks" for adding a lens collar was for adjustments that make it a lot more usable. That doesn't mean it's not usable unmodified. Most people just use tilt-shift adapters like that without modifications.
As an easier way of adding a lens collar to that adapter, same adapter but with 3d printed spacers I designed for the collar to grab the camera side of the adapter. No modifications to the adapter or collar needed.
sfogg wrote:
As an easier way of adding a lens collar to that adapter, same adapter but with 3d printed spacers I designed for the collar to grab the camera side of the adapter. No modifications to the adapter or collar needed.
Shawn
That's a clever design Shawn. Nice.
How are you finding the usability? My preference is always to put the collar on the lens side because I want the lens to stay still and the camera to move. I find this works better for flat stitching (no chance of parallax error if the lens doesn't move) and for tilt (reduced need for recomposition because the tilt is happening on the camera side rather than the lens side).
Thanks. It works fine but I actually haven't used it all that much as I tend to prefer the shift only adapter from Kipon as I use it as a general adapter for my P645 lenses and so far have used shift more than tilt.
Makes sense what you are saying about only moving the camera. But with the camera side fixed this is consistent in use with my other adapter or my shift and/or tilt lenses with the camera on the tripod.
I have the 150 f3.5 A version. Only used it for portraits so far but it does well. Sharp and a smooth transition to background blur. The lens is pretty small but obviously a bit longer when mounted to the adapter.
sfogg wrote:
I have the 150 f3.5 A version. Only used it for portraits so far but it does well. Sharp and a smooth transition to background blur. The lens is pretty small but obviously a bit longer when mounted to the adapter.
Shawn
Yeah, the Pentax 645 adapter should be 44 mm, so pretty long. But still only 115-116 mm in total.
I realized that the Mamiya 150/3.5 is almost exactly the same size with adapter, so that might be an option as well.
Right now I have the OM 135/3.5 at 92 mm including adapter, and the Mamiya 210/4 at 174 mm with adapter. The latter is a bit too long for my usual bags, so the 150 mm lenses should fit the bill. And give better performance than the OM, hopefully.
Edit: I've been thinking of getting the GF 100-200, but it's simply too large. Especially considering the smallish zoom range, small aperture and not the nicest rendering (even though sharpness looks good, but that's not everything).
Makten wrote:
Anyone tried the Pentax 645 150/3.5? I just realized how small and light it is, which would be ideal for my use. If it's good enough, that is.
It's a nice little lens. It wants to be closed down a bit to get really good, and if you really pixel peep you might see a bit of purple fringing here and there. My Mamiya G 150/4.5 is better, but the Pentax is still outstanding value.
For someone who wants to use Pentax 645 on GFX, a really nice three lens outfit is the A versions of 35/3.5, 75/2.8 and 150/3.5.
I've got a set of Mam7 lenses, would love to use them on the GFX.
Have you tried any of the other Mamiya G (6/7) lenses on the 50R?
Have you tried the fotodiox adapter for these lenses?
I've got a set of Mam7 lenses, would love to use them on the GFX.
Have you tried any of the other Mamiya G (6/7) lenses on the 50R?
Have you tried the fotodiox adapter for these lenses?
Thx
I use the Mamiya G 50/4 and 150/4.5 on my GFX 50R outfit. Both are superb.
I haven't used Mamiya 7 lenses or that Fotodiox adapter. If you have a Mamiya 7 150/4.5, I have read that the optics are the same as my G version.
I've seen some samples made with Mamiya 7 lenses that were adapted for use on a medium format back and they looked good.
I've also seen MTF charts for all the 7 lenses and they are impressive. I have no reason to believe that they won't be excellent.
My usual advice at this point is: if you have them and can afford the adapter, give it a whirl. However, unless you have a specialized need (like I did) I wouldn't buy them; I'd get Fuji GF lenses instead.
I've been hesitating since the adapter is pretty expensive, Maybe i'll pick one up since I have the 43, 50, 65, 80 and 150 lenses which would make for a nice set on my GFX until I can afford more native lenses...
I've been hesitating since the adapter is pretty expensive, Maybe i'll pick one up since I have the 43, 50, 65, 80 and 150 lenses which would make for a nice set on my GFX until I can afford more native lenses...
That's a really nice set. As you're probably aware, the prices people are asking for those lenses are quite high. If you try them and are not happy, you can sell them and get yourself some GF lenses with the proceeds.
If you're OK with manual focus, I have a feeling you'll like the results. Mamiya didn't cut any corners with those lenses.
If you are looking for a longer zoom the Pentax 150-300 is good too and pretty inexpensive. It is a long lens though.
rdeloe wrote:
It's a nice little lens. It wants to be closed down a bit to get really good, and if you really pixel peep you might see a bit of purple fringing here and there. My Mamiya G 150/4.5 is better, but the Pentax is still outstanding value.
For someone who wants to use Pentax 645 on GFX, a really nice three lens outfit is the A versions of 35/3.5, 75/2.8 and 150/3.5.
Thanks! I'm mainly looking for smallest possible lens in the ~135-200 mm range to be able to bring it while riding bicycles, because then it must fit a very small bag. The OM 135/3.5 is surprisingly good at close range but not at infinity, and there is a ton of fringing in bright light situations. The Mamiya 210/4 is nice but simply too long physically to fit the bag, and it's also obviously better the closer you focus. Sort of the opposite of what I usually need.
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I got a ton of GF lenses for wider stuff, so no real need for a kit. But, I'm longing for a shift solution that would allow the Pentax 105/2.4 to be shot wide open and stitched to full 6x7. I really doubt that the small shift adapters have a large enough opening at that amount of shift at f/2.4, though. And technical cameras are either too expensive or to large and heavy. Maybe I could 3D print something...
A shift solution for 45-50 mm is also tempting just to straighten things up without stitching. In that case I'm sure the shift adapters would suffice.
Makten wrote:
Thanks! I'm mainly looking for smallest possible lens in the ~135-200 mm range to be able to bring it while riding bicycles, because then it must fit a very small bag. The OM 135/3.5 is surprisingly good at close range but not at infinity, and there is a ton of fringing in bright light situations. The Mamiya 210/4 is nice but simply too long physically to fit the bag, and it's also obviously better the closer you focus. Sort of the opposite of what I usually need.
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I got a ton of GF lenses for wider stuff, so no real need for a kit. But, I'm longing for a shift solution that would allow the Pentax 105/2.4 to be shot wide open and stitched to full 6x7. I really doubt that the small shift adapters have a large enough opening at that amount of shift at f/2.4, though. And technical cameras are either too expensive or to large and heavy. Maybe I could 3D print something...
A shift solution for 45-50 mm is also tempting just to straighten things up without stitching. In that case I'm sure the shift adapters would suffice....Show more →
If you want to do some pixel peeping to see how the Pentax 645 150/3.5 does at infinity, it's in this collection: https://drive.google.com/drive/folders/1mIInzlyRvnMKS-MLOEdVjwX5gkNY3Xqn?usp=sharing These are full resolution JPEG images. There are notes in the folder explaining the setup. You can also compare to a couple other 150mm lenses on GFX.
I recently discovered something I did not know about the Kipon Pentax 645 to GFX tilt-shift adapter. It costs double the Fotodiox tilt-shift, and I always thought it was just overpriced. However, I've since learned that it might actually be worth the money. It has two things going for it:
1. They've solved a major problem with these adapters, which is that you can't do rise after tilt. In their design, the shift movement is now independent of the direction of the tilt movement.
2. You can shift it 15mm instead of 12mm. A 12mm shift on GFX makes no sense. To have the same relative movement as full frame, you need 15mm. You need just over 12.5mm to flat stitch two portrait frames together to create a 4:3 frame, so a 12mm shift adapter is not good enough. Now most Pentax 645 lenses won't give you 15mm of good shift (but some do).
Makten wrote:
Thanks! I'm mainly looking for smallest possible lens in the ~135-200 mm range to be able to bring it while riding bicycles, because then it must fit a very small bag.
My longer helicoid arrived today and as an outside of the box setup this might be able to give you a *tiny* lens in the shorter end of that range.
At full extension the Kodak Ektar 105mm f3.7 focuses to about a 19" from the front of the lens.
Fully compressed the lens is basically the same size as the GFX 50mm f3.5.
I have an Ektar 135mm that I will try on this to see if it will hit infinity and to see how close it could focus. Could stack one of the shorter helicoids to add 17mm of length but could give up to 31mm more extension if needed.
This took the long helicoid and 3 short ones. I think two long helicoids would give roughly the same focusing but would be a bit more compact closed up.
I've tested 90mm TS-E Canon lens using Viltrox adapter and it works quite well. I seen vigentting at 10mm SHIFT in either direction. Below that it is fine. Also included for comparison is A7sii files.
Fotodiox Nikon to GFX Mount adapter GFX 50 SII and a Samyang 14mm F/2.6 lens. At F4 the vignetting greatly goes away, examples below, excuse that they are nothing special, literally a test I shared for someone here. @ F/5.6 is pretty sharp throughout. There is zero processing on these other than reduction and framing. The full res look a lot better. In doing a better test against a bright white background the top left corner remains problematic even past F/5.6 and would require a little cropping. The quest for a great Wide continues! Crop loss shown on top left of larger res image.
