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Forum: Lens Clubs 12-07-2014, 03:25 PM  
Takumar club
Posted By kkx
Replies: 17,664
Views: 3,377,889
Very nice shots.

Might just try to get this lens to try it out.

Thanks for sharing.
Forum: Lens Clubs 01-02-2013, 11:52 PM  
Adaptall Mount Club (Tamron).
Posted By kkx
Replies: 4,113
Views: 727,158
First out door test of my copy of 19AH.

I might not nail the focus, but I like what the lens can do so far. Contrasty.

I thing I stop down to F8 for this.
Forum: Lens Clubs 08-05-2012, 05:51 PM  
Adaptall Mount Club (Tamron).
Posted By kkx
Replies: 4,113
Views: 727,158
I have manage to acquire the 90mm 2.8, 60-300mm and the 17mm.

All very nice.

My 17mm have a slightly loose focusing ring. There is a bit of play before the actual focusing is "engaged". Thinking of trying to "tighten" whatever that is loose inside. Anyone know how to take the 51B apart?

Been trying to get out and use the nice macro lens more.

Here is a sample:
Forum: Pentax SLR Lens Discussion 07-22-2012, 09:39 PM  
UWA for K-5
Posted By kkx
Replies: 22
Views: 2,789
Very nice result using FA limited lenses on 5D. These sort of result is what encourage me to try multiple systems. But I think (maybe I miss something) Nakamura modify the lens to be use on 5D only. If I were to use them on K-5, these lenes will most likely be acting like a PK/M lens (I have mod my K-5 with a shorted A-pin).

-kk
Forum: Pentax SLR Lens Discussion 07-22-2012, 09:36 PM  
UWA for K-5
Posted By kkx
Replies: 22
Views: 2,789
Unfortunately a Zeiss lens is just too expensive for me at the moment. I wish I can try it out. it must be very good on a FF body. :)
Forum: Pentax SLR Lens Discussion 07-22-2012, 09:34 PM  
UWA for K-5
Posted By kkx
Replies: 22
Views: 2,789
It is true that adaptall is the most convenient to share between the two system.

I will get full PK/A functionality with a PK/A adaptor (already have one with a 90mm macro).

So, I have decide to try out the Tamron 17mm first. One is on its way, should be here next week.

As for the other suggestions, thanks. I will keep them in mind. With all the limitation, maybe I should give up about sharing lenses between K-5 and 5D2.

Trying to aim at different usage for each system might be a wiser thing to do. Still trying to figure this things out.

Thanks for all reply, really appreciate it.

-kk
Forum: Pentax SLR Lens Discussion 07-22-2012, 01:29 PM  
UWA for K-5
Posted By kkx
Replies: 22
Views: 2,789
Hi,

I just realized that if I choose a PK/A mount UWA (or any PK/A lens), for my K-5, I will not be able to use it on the 5D.

The aperture level will block the mirror.

Some lens have the level protector too, but these can be remove (most of the time, either destructive or not), but the metal level will still cause problem.

I can remove or cut down (I always avoid destructive options when possible) the level for PK/M lens, but to loose the auto aperture function is a pain.

I prefer A lens when I use my K-5, so much easier and I have correct exif.

Apart from PK/M, M42 and adaptall lenses are the one two that I will have no problem sharing.

This is bad news for me. Was really looking forward to get more PK/A lenses (UWA or others).

Do anyone have experience on this? Can I file down the level a bit (just enough avoid the 5D mirror, but still enough to engage the aperture mechanism in the K-5 body?

If I have access to the correct machine/tools, I could make my own PK/A to EOS adaptor, that rotate the lens 180 degree from what the current common PK/A to EOS adaptor does. To place the aperture level on the bottom right conner of the EOS mirror box instead of the top left conner. I did a simple test, you just about able to clear the mirror without any mod on the aperture level.

Bummer. If anyone can help I will be really grateful.

-kk
Forum: Pentax SLR Lens Discussion 07-20-2012, 01:33 PM  
UWA for K-5
Posted By kkx
Replies: 22
Views: 2,789
Thanks pentaxmz and jimr-pdx,

I generally stay away from fisheye, not because of personal experience (I have none). Maybe I should try one out. Renting or borrow one. Hmm..... choices.

It is hard to decided. But If I can find a good rectilinear, that can do good lanscape for both system, then fisheye can wait till my next LBA attack. :)

-kk
Forum: Pentax SLR Lens Discussion 07-20-2012, 01:30 PM  
UWA for K-5
Posted By kkx
Replies: 22
Views: 2,789
Hi,

Mount is not important. M42, pentax-k (A prefered) and adaptall is ok. As long as I have means to use it on both K-5 and Canon-eos (via adaptors).

The sigma 12-24 looks good. Expensive and I need the version 1 (the one with aperture ring), can't seems to find them.

The samyang 14mm 2.8 is still on top of my list (with PTLens to correct distortion, I think it will be a great solution).

The sigma zoom range (12-24) is really versatile, so I am tempted to try this. Anyone know at 14mm, how is the sigma compared to the samyang? If the different it acceptable, I might consider paying the extra (diff of USD500) and try to hunt for a sigma version 1.

Thanks for the reply and hopefully, I will find a wide angle soon. Now I am surviving with a komine 2.0 28mm close focus. Been testing it and not so happy with the result (on both K-5 and 5DII). Maybe it is just me doing something wrong, but it is soft for distance (over 10m to inf) shots. But on near distance, it is quite good.

-kk
Forum: Lens Clubs 07-12-2012, 04:50 PM  
*Macro* lens club
Posted By kkx
Replies: 4,126
Views: 556,665
Hi,

Been trying to find some comparison between Tamron 72B and Kiron 105 macro.

Not able to find much. Some people seems to say that Kiron is weaker wide open (softer and have purple fringe).

I know that kiron is heavier, and have much longer focus throw (two full turns?) which can be pro or cons depending on your need (tripod vs on the move hunting live active subjects).

If anyone have experience with these two lens, please share your personal experience, it will be useful for me, even with sample variation and the fact that most of the macro lens of this category have very good sharpness to begin with and the differences can be very small.

Thanks in advance.

BTW, how does 72B fare in comparison to 52B (assuming the matching 2x TC or tube are used to get to 1:10 ? I read that some people say that the newer 72B is shaper and more contrasty (did manage to find one side by side comparison), how do people here few?

I prefer not to use TC or tube. The matched TC does seems to keep IQ lost to minimum, but you still lost two stops of lights. 72B at 1:1 does not lost as much light, I presume?

I also read that 72B is internal focus, but it seem that the lens extend as it focus closer, it is really IF? What is the effective aperture at minimum focus distant (1:1), not 2.8, I presume.

Sorry for too many questions. It is quite hard to find good info, any help will be appreciated. Thanks again.

-kk
Forum: Pentax DSLR Discussion 07-11-2012, 11:02 PM  
help with PKA adaptor
Posted By kkx
Replies: 3
Views: 1,162
Thanks for the helpful and detailed reply.

The pdf manual is very useful.

I follow the instruction carefully and redo everything.

I didn't know that I need to press the black tap before I can set the lens to AE mode. Thanks for telling me. Luckily I didn't force anything, so nothing broken.

If the range of 2.8-22 is correct when I use the TC, then all is ok. Sometimes I get 4.0-22, I think that is due to poor contact.

About AE not working, I have finally found out why.

I have a mod on my K-5 body. Shorted the A pin with some tin foil. Totally forgotten about that. So my body will not operate on K-M mode correctly. My bad.

Tested the whole system properly and all seems fine.

Thanks, and I will visit the Adaptall club, lots of nice info there. Will be useful to guide me to my next adaptall lens.

Thanks again.

-kk
Forum: Pentax DSLR Discussion 07-11-2012, 03:42 AM  
help with PKA adaptor
Posted By kkx
Replies: 3
Views: 1,162
Hi,

I am having trouble with pka adaptor when using it with TC 01F 2x and 90mm F2.8 macro (72B).

Using the adaptor on the 72B directly work better. AE and non-AE all works.

Aperture range is recored correctly at F2.8 - F22 (I assume this is correct, since F32 is for AE).

Only problem is that, some time I get F-.-, and need to jiggle the lens a bit to get it to work.

When it works, all is fine. A bit annoyed by the F-.- (when i get this without knowing it, the exposure will be all wrong).


When I use it with the TC, the same problem with F-.- is still there. Seems to happen more often, but it might be just my impression.

But the aperture range is wrong. Its sometimes show F4.0 - F22, and other times show F2.8 - F22. Its very unstable.

It should be F5.6 - F45 isn't it?

Exposure is ok, but I feel it is over expose by one stop, when it show the range of F4-F22. Have to test it more, especially when it show F2.8-F22 (to check if I get 2 stop over exposure). It is not conclusive at the moment.

I hope to fix this if possible.

A second problem, not so important, because I seldom use non-AE mode, but it could indicate what is wrong with my adaptor.

With TC, If move away from AE, then the lens will only work wide open regardless of my aperture ring position (when I use non-AE, I always do M mode and set my own exposure). So using "correct" shutter speed, will result in over exposure because the lens will not stop down.

One observation that might mean something: I need to press the black tab on the adaptor lightly to set the aperture ring to AE mode. Otherwise, it will stuck at F22. This is true when use with and without the TC. Not sure if this is normal.

I try to mount the TC and the adaptor using the steps I found in this forum. Follow it exactly. Still no joy.

I have also try to clean the contact (the 3 small screw) as suggested by an old thread here. Again, no change.

All these items are from seller in the marketplace in this forum, and they should be in good shape. Maybe I did something wrong.

Any help and suggestion will be very much appreciated. Thanks in advance.

-kk
Forum: Pentax SLR Lens Discussion 07-11-2012, 03:05 AM  
UWA for K-5
Posted By kkx
Replies: 22
Views: 2,789
Thanks for all the reply.

Seems like the Samyang 14mm is a viable options.

If I can build my own lens profile (seems like there is a easy to use profile maker/builder) or copy one from someone else, I should be fine. I should only need to correct some of the photo, those with lines that make the distortion very obvious.

I will also check out FA 20mm and FA 24mm. If I can get them with good price. 24mm is a bit too long for K-5, for me, I think.

Stitching is possible, but not for all occasions. I have software for stitching and did play around a bit. Adding some extra steps and effort. Still like to have the one click options available, for scene with moving objects etc.

M20/F4 sound interesting too. Will check out some reviews and price.

Thanks again for replies. Other suggestions are still welcome. Like always, I might end up getting more than one lens. :)

-kk
Forum: Pentax K-5 07-11-2012, 02:56 AM  
MLU with timer
Posted By kkx
Replies: 5
Views: 1,104
Rawr, yup did all the steps. Tried again after reading your post, still the same.

Johnx, Thanks for your reply. Didn't know that with timer, the mirror always lock up at shutter press.

Tested it and all is fine.

Thanks.
Forum: Pentax K-5 07-10-2012, 09:37 PM  
MLU with timer
Posted By kkx
Replies: 5
Views: 1,104
Hi,

Been trying to take tripod shot with MLU.

I am without a cable release at the moment.

Can't seems to be able to do MLU with timer delay.

I.e:

Press shutter -> Mirror go up -> press shutter again -> start timer -> after 2 sec (or 10 sec) -> take photo

I am hoping that the timer will allow the camera to stablise after my push shutter action ( which can cause some movement).

What am I doing wrong?

Help appreciated.

-kk
Forum: Pentax SLR Lens Discussion 07-10-2012, 09:04 PM  
UWA for K-5
Posted By kkx
Replies: 22
Views: 2,789
Hi,

Which UWA (shorter than 24mm) would you recommend for K-5?

Lens must be FF combatible and have manual aperture ring trying to share this with my canon bodies.

Zoom or prime is ok, but IQ must be significantly better than kit lens (18-55mm WR).

I am thinking of Samyang 14mm, but the distortion is giving me pause. Should I be worry?

How about Tamron SP 17-35mm? For this one, I worry that it is not much of an improvement compared to the kit lens.

I hope to use this for landscape mainly, so slower lens is ok, looking for edge to edge performance for FF, but fast aperture will also be useful when I need this for indoor occasionally.

-kk
Forum: Sold Items 06-08-2012, 01:28 AM  
For Sale - Sold: Rokinon 14mm F2.8
Posted By kkx
Replies: 5
Views: 1,105
PM sent
Forum: Pentax K-5 04-22-2012, 11:06 PM  
All the fuss about AF point size
Posted By kkx
Replies: 94
Views: 23,613
The theory about the size of the sensor had been quite useful, seems to help me "work" the AF system "better".

But the other day, I try to did a test.

I focus on a car licence plate through my window with blinds. The gab between the blind blade is very small, just about a bit bigger than the centre square AF marking. The AF does sometime hunt between the blind and the licence plate, but it can latch on to the licence plate lettering most of the time (in good day light).

I was a bit surprised by this.

Maybe the bright sun light and the good contrast of the lettering on the licence plate helps.

Not sure if the AF sensor does really have issue with focusing on smaller area. What do you guys think?

I have yet to do more test, but would just like to share this and get some feedback from more experienced people.

-kk
Forum: Pentax K-5 02-22-2012, 04:56 AM  
AE lock with half shuttle press - when manual focus
Posted By kkx
Replies: 1
Views: 1,176
I have been using the half shuttle press to lock AF and AE when recompose, working great for AF lenses.

When I use manual focus lenses (old PK/A or M42), I use the AE-L button to lock AE when I need to.

All ok.

But I sometime find it easier to use just half shuttle press for AE lock when using manual focus lenses, pressing the shuttle is somehow easier/faster and more natural than move my thumb to the AE-L button.

Anyway, after some experimenting, I have come to the conclusion that it can be done with K-5. Even if I set my AF lens to MF mode, the shuttle will no longer lock AE (due to AF not active, and AE is link to AF etc, I think).

It would be nice if there is a work around to still use the shuttle button to AE lock for MF situation. Anyone know if this is possible and how?

Thanks in advance.

-kk
Forum: Pentax K-5 02-01-2012, 04:20 PM  
newbie question - flash exposure compensation
Posted By kkx
Replies: 11
Views: 1,759
Actually, I am not using a proper pentax-A lens.

I short the a-pin on the camera mount and use my M42 and Pentax-M lens and try to get some pentax-A funtionality, such as Av mode and p-ttl flash.



I know I miss something important, the pre-flash.

I meter with my lens wide open, then AE-L, and stop down my lens to take the shots. The problem is that the pre-flash will measure exposure when my lens stopped down, which will be wrong.

To correct this, I either:
- set aperture on camera to wide open (i.e exif will be wrong) and stop down the lens.
or
- do what I did before, and use exposure compensation to "correct" the exposure.



Thanks, I should have reread the manual again carefully.

But I can't see how the camera can close my aperture when I am in Av mode and using manual lens which the aperture is only controllable from the lens aperture ring.

Maybe I confused you with my poor explanation of my situation. Sorry.



I am interested to know why your shutter is at 1/90, instead of 1/180.

I also find that the exposure is 1ev darker from F8. I am not sure the limited power of the flash cause this. It could be, but it seems unlikely for my case. Still trying to find out why.

-kk
Forum: Pentax SLR Lens Discussion 02-01-2012, 04:06 PM  
Converting K/M lenses by adding an A pin?
Posted By kkx
Replies: 57
Views: 11,304
Thanks for the suggestions, Newarts.

I manage to finally short the a pin using kitchen aluminium foil. Took a few tries.

I kind of did what demp10 have done. Use a blunt pin head to push the foil and make a doom shape before I clamp down the mount plate.

The contact works, but seems a bit "precarious", if this didn't last, I will remember to try the thin copper wire tricks. Sound more "stable" (easier to get a good contact).

Lowell is right, the exposure is not correct. So if anyone plan to do this, bare the limitations in mind.

I kind of get confused at first, but manage to work out that when in use flash I can either have (if I am using M42 lens or pentax-M lens that are not fully mounted, so aperture ring at lens still close down the aperture):

- correct f number in exif and use exposure compensation to "correct" things like demp10 did

or

- set aperture on camera to max, and set actual aperture on lens, which should give correct exposure

Strangely, for my vivitar 28mm f2, it works as expected at f2, f2.8 and f4. At f8 and beyond, I still need +1ev compensation. Will play around with this a bit more and see if my understanding is somehow wrong.

-kk
Forum: Pentax K-5 02-01-2012, 05:22 AM  
newbie question - flash exposure compensation
Posted By kkx
Replies: 11
Views: 1,759
Hi,

When using a Pentax-A manual lens with the on camera flash, I get some over exposed shots in some situation.

I then try to "chimp" to get the correct exposure. So tired to use the flash -2 ev.
Turn out that -2 ev is still not enough, still over exposed.

Then I start on the "normal" exposure compensation (i.e. not the flash ev).

I am using Av mode. When I pop the flash, shutter speed is always set to 1/180 (due to my setting that force it to always go to max flash sync speed? not aware of setting anything like this, I have only enable use of aperture ring in cus fun.).

When I have -2 ev, shutter still at 1/180. But the photo is less exposed (darker). So the "normal" ev control not the shutter speed but flash output?

If this is the case, when using Av mode with flash, the flash ev is defunc ? I can use the normal ev setting to get more than +/- 2.

A bit confused here.

This only occur when I use pentax-A lenses. With the AF kit lens, exposure and flash exposure compensation behave like I knew it. i.e flash ev control flash output power and ev control shutter speed. And I normally use this to get a balance between fore-ground subject vs back ground exposure.

Why with manual lens (pentax-A lenses) this is different?

BTW, if I don't pop the on camera flash, the exposure compensation control the shutter speed as per normal when I use these pentax-A lenses.

-kk
Forum: Pentax K-5 01-31-2012, 09:57 AM  
Best screen ever for manual focus : Canon ee-S!!!
Posted By kkx
Replies: 769
Views: 169,969
I have the canon 550D, up graded to K-5 for brighter and bigger OVF (and in body SR) so that I can use my manual focus lenses better.

I am having a lot of difficulties focusing my 50mm 1.4 on my 550D. I am surprise to read that you think the 400D is better than the stock K-5. My stock 550D is not better than my stock K-5. I don't expect the stock screen in 550D is much different compared to the 400D. Anyone else have any experience or info on this?

But replacing the stock K-5 with the canon s-type is a HUGE improvement. I can now focus my 50mm 1.4 with relative ease (holding back mainly by my poor eyesight).
Forum: Pentax SLR Lens Discussion 01-29-2012, 05:25 PM  
Converting K/M lenses by adding an A pin?
Posted By kkx
Replies: 57
Views: 11,304
Thanks for the info.

I wasn't being clear, I was trying to mod the camera so that it will think all my MF lens are pentax-a lens. My main reason for doing this is to get p-ttl flash when using my old MF lenses.

For pentax-M lenses, I know the aperture will be wrong, will work out how to get around that when I am there. But I will mainly use this for my takumar M42 lens. So no problem there, I also get aperture recorded in exif, which is a bonus. Stop down metering will be more "painful" (meter at full open, then AE-lock, and stop down the lens etc, I use to this when I use MF lens on Canon, not very nice, but if I can flash to work correctly and exif, then this is the price to pay).

I kind of like the drill a second hole for pentax-m lens to mount in such a way that I still can control aperture fully manually.

Anyway, still can't manage to short the a-pin on my K-5. Camera still showing F--. Need to have another go tomorrow.

-kk
Forum: Pentax SLR Lens Discussion 01-28-2012, 08:37 AM  
Converting K/M lenses by adding an A pin?
Posted By kkx
Replies: 57
Views: 11,304
Hi,

I am trying to do this mod on my K-5.

Turn out that the mount ring and the contact pin A act as a "punch" and cut out a hole on the foil (kitchen aluminium foil).

Should I use a ticker foil? I think the same thing will happen. There is just no space/gap between the hole on the mount ring and the rubber/plastic ring that surround the a pin.

Maybe K-x and older pentax camera have a bit more tolerant/gap on the mount ring? I have a feeling that I am not doing this correctly.

I am thinking of file the hole on the mount ring (for the A pin) a tinny bit bigger using a round diamond file. But before I do this "destructive" action, would like to hear some advise from people who have done it correctly.

Thanks in advance.

-kkx
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