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07-05-2011, 08:20 AM   #1
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645D Focusing Screen

Has anyone tried the Brightscreen focusing screens on the 645D? Also, are all focusing screens made for the 645 compatible with the 645D? Here's a link to the 645D focusing screen by Brightscreen. I was thinking about getting model, "p905h" (The #5 style). Thanks!

Brightscreen styles of screens

07-06-2011, 02:12 AM   #2
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I do not own a 645D, but I would assume the screens made for 645/645N are not compatible as they are bigger.
07-06-2011, 09:13 PM   #3
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Even the 645N and 645 don't have interchangeable screens.
07-06-2011, 09:35 PM   #4
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They do have interchangeable screens!

The size of 645NII and 645D screens seems to be the same. I did not test if I can actual change them.

-Linus-

07-07-2011, 12:49 AM   #5
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QuoteOriginally posted by -Linus- Quote
The size of 645NII and 645D screens seems to be the same. I did not test if I can actual change them.
I am not sure it is true. Due to construction, the focusing screen and the film/sensor plane are located at the same distance to the mirror (How else could you have a focused image on the screen and on the sensor ?)

The 645NII has a focusing screen size covering 92 % of a 56x41.5mm image (i.e. a 52.1x38.2mm screen size) while the 645d focusing screen covers 100% of 44x33mm.

Source for 645 film series : https://www.pentaxforums.com/forums/pentax-dslr-camera-articles/110932-pentax...-compared.html
07-08-2011, 04:12 AM   #6
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645D interchangeable screens

Hello,
Happy owner of a 645D since December, i can confirm that the screens for the"old" 645NII fit perfectly well the 645D (but not those for the 645N)

I use two of them since 2 months
- the AA-82 : microprisms,
- the AB-82 : split screen

The size is exactly the same.
Seems to be something like a "mask" between the prisme and the screen to get the right size of view (size of the sensor)
It took about 2 minutes to change
Absolutly no problem to use them with FA lenses (af lenses) with autofocus and very confortable to use with A lenses (mf lenses). Or with 67 lenses.
The focus confirmation (the green focus led in the viewfinder) works too.


Small trick :
With FA lenses, used in manuel focus mode, it's a good way to check the accuracy of the focus and/or the need to use or correct the fine focus adjustment !!!!
(and all the FA lenses need to be fine adjusted - the new DFA 55 too - with my 645D boby - perhaps not true with an other one)

To have both microprisme and split on the same screen, i have ordered (and payed) a brightscreen on 29/04.
Not recieved yet. Seems that something is not going so good by them.

Hope it help.
Have a good day

Last edited by martini; 07-08-2011 at 04:43 AM.
07-08-2011, 07:12 AM   #7
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QuoteOriginally posted by martini Quote
Seems to be something like a "mask" between the prisme and the screen to get the right size of view (size of the sensor)
That's something I did not think about. It explains a lot

Thanks for sharing !
07-10-2011, 10:53 PM   #8
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QuoteOriginally posted by martini Quote
Hello,
Happy owner of a 645D since December, i can confirm that the screens for the"old" 645NII fit perfectly well the 645D (but not those for the 645N)

I use two of them since 2 months
- the AA-82 : microprisms,
- the AB-82 : split screen

The size is exactly the same.
Seems to be something like a "mask" between the prisme and the screen to get the right size of view (size of the sensor)
It took about 2 minutes to change
Absolutly no problem to use them with FA lenses (af lenses) with autofocus and very confortable to use with A lenses (mf lenses). Or with 67 lenses.
The focus confirmation (the green focus led in the viewfinder) works too.


Small trick :
With FA lenses, used in manuel focus mode, it's a good way to check the accuracy of the focus and/or the need to use or correct the fine focus adjustment !!!!
(and all the FA lenses need to be fine adjusted - the new DFA 55 too - with my 645D boby - perhaps not true with an other one)

To have both microprisme and split on the same screen, i have ordered (and payed) a brightscreen on 29/04.
Not recieved yet. Seems that something is not going so good by them.

Hope it help.
Have a good day
Don't you mean the screens fit the 645n and 645nII but not the original manual focus 645?

I have a 645n with the AB-82 in it.
The only things holding me back from the 645D are/were lack of focussing screens and lack of a fast portrait lens to match the smaller sensor.

Looks like my bank account will be empty soon.

07-11-2011, 03:29 PM   #9
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Your right !
Have read my post again this morning, and saw my mistake.
The 645N and 645NII have both the same screens.
Only the screens for the 645 don't fit the 645D.
07-11-2011, 04:14 PM   #10
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QuoteOriginally posted by NotaxPen Quote
Don't you mean the screens fit the 645n and 645nII but not the original manual focus 645?

I have a 645n with the AB-82 in it.
The only things holding me back from the 645D are/were lack of focussing screens and lack of a fast portrait lens to match the smaller sensor.

Looks like my bank account will be empty soon.
Come on. You should be able to afford a focusing screen.

Pentax has three focusing screens as well--I have the grid in my 645D. And the Pentax 67 105mm f/2.5 makes a nice fast portrait lens, or the 645 FA 75mm f/2.8, or the 645 FA 150mm f/2.8.
07-11-2011, 11:01 PM   #11
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The 67 165mm f/2.8 is not bad either, with a 67x645 adapter.
07-13-2011, 01:15 PM   #12
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QuoteOriginally posted by -Linus- Quote
They do have interchangeable screens!

The size of 645NII and 645D screens seems to be the same. I did not test if I can actual change them.

-Linus-
They do have interchangeable screens, but they are not interchangeable from one to the other.
07-14-2011, 09:34 PM   #13
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QuoteOriginally posted by Yamanobori Quote
Come on. You should be able to afford a focusing screen.

Pentax has three focusing screens as well--I have the grid in my 645D. And the Pentax 67 105mm f/2.5 makes a nice fast portrait lens, or the 645 FA 75mm f/2.8, or the 645 FA 150mm f/2.8.
I think you misread my post. I already have a focus screen, It's the 645D that will empty my bank account.

None of the focus screens made specificaly for the 645D have split-image or microprism, so are useless for manual focus. That's why it's great to see someone post that the previous screens for the 645n/nII will fit the 645D.

I don't think I'll be buying any 67 lenses for a cropped 645 camera. I'm looking for the 645D equivalent of my DA* 55/1.4 that I have for my K-5, or my 645 135/4 LS as far as field of view.
07-15-2011, 06:41 AM   #14
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QuoteOriginally posted by NotaxPen Quote
I think you misread my post. I already have a focus screen, It's the 645D that will empty my bank account.
You need a sense of humor

QuoteQuote:
None of the focus screens made specificaly for the 645D have split-image or microprism, so are useless for manual focus. That's why it's great to see someone post that the previous screens for the 645n/nII will fit the 645D.
I only have one AF lens for my 645D. I find manual focus easy enough with the Pentax screens--I replaced my original with the gridded.

QuoteQuote:
I don't think I'll be buying any 67 lenses for a cropped 645 camera. I'm looking for the 645D equivalent of my DA* 55/1.4 that I have for my K-5, or my 645 135/4 LS as far as field of view.
So you want a 100mm/105mm lens for the 645D. Since you don't want to use a 67 lens, although I am not sure why as there are many examples of them working well on a 645D, then the A/FA 645 120mm f/4 Macro would be the best fit.
07-16-2011, 03:15 PM   #15
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QuoteOriginally posted by Yamanobori Quote
You need a sense of humor



I only have one AF lens for my 645D. I find manual focus easy enough with the Pentax screens--I replaced my original with the gridded.



So you want a 100mm/105mm lens for the 645D. Since you don't want to use a 67 lens, although I am not sure why as there are many examples of them working well on a 645D, then the A/FA 645 120mm f/4 Macro would be the best fit.

OK, you got me there. I think most persons who post on these forums take most things too seriously, myself included.

I haven't tried the 645D yet, but my 645n was nearly useless with the plain matte screen in it. (I only have manual focus lenses) Most of the posts I've read here seem to indicate that most have trouble getting precise focus manually with the 645D, but that may be just because they are used to autofocus. My K-5 was also difficult to manually focus with the stock screen. After I replaced it with a Katzeye splt/microprism screen, the difference is like night and day.

I think my bias against 67 lenses is probably because I imagine them overkill, or bulkier than necessary for the smaller camera. That might change if I had the opportunity to try one out. If I inderstand the crop factor correctly, the 120mm would be just a little too long for anything but tight headshots. I could use the 75mm for looser shots, but I'd like to have something in between that I could use without having to keep changing lenses. The 135mm LS on the full-frame 645 gives me headshots to 3/4 length shots in a small studio. On the cropped sensor 645D, about 107mm would be about perfect if I'm calculating the crop factor correctly.
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