adapter for Carl Zeiss Jena phototube setup

JohnyM · Post by **JohnyM** » Thu Dec 13, 2018 9:43 am

If there is glass in the filter, it's rather undesirable, unless you got some specific aplication.
If there is no glass inside, you can purchase "filter adapter" of desired size for cheap. Search ebay for appropriate model, ie: filter adapter 52
My guess is that referenced image is just an UV filter glued to zeiss dovetail or screwed via 52mm thread.

JohnyM · Post by **JohnyM** » Thu Dec 13, 2018 9:52 am

As for dovetail itself, if you can afford some extra bucks, buy directly from zeiss:
https://www.micro-shop.zeiss.com/?s=164 ... 5&cm=m1108

If not, scourge ebay for parts donors ie:
https://www.ebay.com/itm/LOMO-extetion- ... rk:14:pf:0

Or seek someone who can do customwork for you.

PeterArmitage · Post by **PeterArmitage** » Thu Dec 13, 2018 10:11 am

Hi Ichty,

I can get a Canon 40 mm F2.8 STM pancake lens (52 mm thread at end) for about $180 cdn and the Andoer 52 mm filter for $10.

I currently have a 18-55 mm zoom lens on the camera with a 58mm thread at the end.

A new Canon 50 mm 1.8 lens costs $189 cdn (49 mm thread at end). Maybe I can find something cheaper on eBay??? Do you know where I can find a “50 mm prime lens” cheaper than this?

As noted previously, I already have a Zeiss Jena MF 4:1 23 mm projection lens (eyepiece) on order (it should arrive early January).

PeterArmitage · Post by **PeterArmitage** » Thu Dec 13, 2018 10:12 am

Good point JohnyM re. "glass in the filter."

I'll look for an alternative as you recommend. Thank you.

Peter

Pau · Post by **Pau** » Thu Dec 13, 2018 11:06 am

PeterArmitage wrote:A new Canon 50 mm 1.8 lens costs $189 cdn (49 mm thread at end). Maybe I can find something cheaper on eBay??? Do you know where I can find a “50 mm prime lens” cheaper than this?

As noted previously, I already have a Zeiss Jena MF 4:1 23 mm projection lens (eyepiece) on order (it should arrive early January).

-sure: for example the Olympus OM Zuiko 50mm f1.8 (MC or Auto-S versions) I use is well proven, excellent and both cheap and easy to find. The filter thread is 49mm and you need a OM to EOS adapter. Most old manual 50mm primes will do (Olympus OM, Zeiss Jena, Pentax, Nikon, Yashica/Contax and some others for sure, ask if in doubt)
In general old style manual focus lenses are more convenient than modern AF ones because their solid full metal construction vs plastic wobbling modern ones, be aware that the camera will be coupled and held by the lens filter thread.

- If the 4:1 eyepiece does what it seems do you will get a heavily cropped image: 4X magnification is excessive, remember that the adequate magnification is 1.6X

I've googled a bit and the lower magnification MF projectiv I've found is 3.2:1, still too high

PeterArmitage · Post by **PeterArmitage** » Thu Dec 13, 2018 12:40 pm

Okay, I see that I can get an Olympus 50 mm prime lens cheaply on eBay.

To be clear about the setup, what do you think of this?

1. Zeiss Jena phototube

2. ARL ZEISS JENA microscope eyepiece PK 8x (18) (d= 23,2)
https://www.ebay.com/itm/CARL-ZEISS-JEN ... rk:13:pf:0

3. dovetail adapter with 49 mm thread?

4. spacer like the Andoer UV filter but without glass, 49 mm thread

5. Olympus OM Zuiko 50mm f1.8 (MC or Auto-S versions)
https://www.amazon.com/Olympus-Manual-F ... +f1.8+lens

6. OM to EOS adapter (for Olympus 50 mm lens connect to Canon EOS)

Thank you!

Pau · Post by **Pau** » Thu Dec 13, 2018 1:11 pm

Yes, at least from the eyepiece to the camera, this is what I use in my third setup (although with Zeiss West stuff)
8*50/250 = 1.6 will provide you the right secondary magnification for APSC

Some points:
3. dovetail adapter with 49 mm thread?
4. spacer like the Andoer UV filter but without glass, 49 mm thread
you also can get the dovetail adapter with other threads ("T2" M42X0.75 in the very nice telescope adapter suggested by Ichty, M52X0.75 to have a more standard thread...) and the adequate step up or step down adapter for M49X075 in place of the filter ring

- check that both the upper surface of eyepiece and front surface of the lens are clean and undamaged, if not it would show diffuse dark spots. The linked PK 8X seems very good.

- You can find at ebay both the camera lens and OM adapter cheaper than at Amazon.

- Not really necessary but I would recommend a chipped adapter (AF Confirm in the vendors language). It doesn't do AF and confirm focus function is not applicable for microscopy but it could prevent some camera info mistakes and LV misfunction

Ichthyophthirius · Post by **Ichthyophthirius** » Thu Dec 13, 2018 2:11 pm

Hi Peter,

The MF-Projektiv 4:1 isn't suitable for you. The magnification is too high and it is not compensating (MF K). For the Planachromats you need plan compensating eyepieces (PK) as it is listed in the Zeiss Jena table you posted. PK is also compatible with the Achromat Phv objectives 40 and 100.

I agree with the suggestions Pau made.

Eyepiece PK 8x/18 plus 50 mm camera lens for afocal. I haven't tested the PK 8x/18 but it should be suitable.

I don't know if you'll find a dovetail adapter with 49 mm thread but I suggest buying the Baader dovetail-to-T2 and simply adding a 49-42mm step down ring. http://camerapix.co.uk/index.php?id_pro ... er=product

You will probably also need some spacers that allow you to adjust the distance between the dovetail adapter and the 50 mm lens so you bridge the hight of the PK eyepiece. Either a set of T2 spacers or a variable T2 extension or both https://optcorp.com/products/stellarvue ... -sfe-m42-v

Regards, Ichty

PeterArmitage · Post by **PeterArmitage** » Thu Dec 13, 2018 3:44 pm

Thanks a million all of you for your immense help thus far!!! I've got a report to write at the moment (this microscope stuff has been a distraction), so I'll digest this over the next 24-48 hours and get back to you. Best wishes. Peter

PeterArmitage · Post by **PeterArmitage** » Sat Dec 15, 2018 8:23 am

This looks to be the appropriate setup for my Zeiss Jena microscope connect to a Canon Rebel EOS camera. What do you think? Thanks again!!!

1. Zeiss Jena phototube

2. ARL ZEISS JENA microscope eyepiece PK 8x (18) (d= 23,2)
https://www.ebay.com/itm/CARL-ZEISS-JEN ... rk:13:pf:0

3. Baader dovetail-to-T2. I take it the thread on this is 49 mm?
https://www.baader-planetarium.com/en/b ... t-07).html

4. 49-42mm step down ring. http://camerapix.co.uk/index.php?id_pro ... er=product

5. One spacer. T2 M42 x 0.75. Or do you think I will need two spacers?
https://optcorp.com/products/innovation ... m-150-1015

6. Olympus OM Zuiko 50mm f1.8 (MC or Auto-S versions). I take it the end of this lens will connect to the spacer with a thread 42 mm?
https://www.ebay.com/itm/Olympus-F-Zuik ... ctupt=true

7. OM to EOS adapter (for Olympus 50 mm lens connect to Canon EOS) chipped (AF confirm)
https://www.ebay.ca/itm/AF-Confirm-Olym ... :rk:3:pf:0

8. For Planachromat objectives (and Phv objectives 40 & 100), compensating eyepieces (PK 10X).

PeterArmitage · Post by **PeterArmitage** » Sat Dec 15, 2018 8:56 am

These are my eyepiece options for PK.

Ichthyophthirius · Post by **Ichthyophthirius** » Sat Dec 15, 2018 12:55 pm

PeterArmitage wrote: 3. Baader dovetail-to-T2. I take it the thread on this is 49 mm?
https://www.baader-planetarium.com/en/b ... t-07).html

4. 49-42mm step down ring. http://camerapix.co.uk/index.php?id_pro ... er=product

5. One spacer. T2 M42 x 0.75. Or do you think I will need two spacers?
https://optcorp.com/products/innovation ... m-150-1015

Hi Peter,

The Baader adapter is T2 (which is 42x0.75). The filter thread on the OM Zuiko 50mm f1.8 is 49 mm. So you need a step down ring to connect.

I can't tell how many T2 spacers you will need. You'd have to measure that yourself.

Regards, Ichty

PeterArmitage · Post by **PeterArmitage** » Sat Dec 15, 2018 4:14 pm

Thanks again Ichty!

Apologies for being stunned about this. First time doing this kind of setup. What do you think of this?

3. Baader dovetail-to-T2. This is a 42 mm male thread.
https://www.baader-planetarium.com/en/b ... t-07).html

4. STELLARVUE 8 MM - 12 MM VARIABLE LENGTH M42 EXTENSION TUB.
42 mm female thread one side, 42 mm male thread other end.
https://optcorp.com/products/stellarvue ... -sfe-m42-v

5. Step up ring. This takes me up to 49 mm to mate to camera.
Need 42 mm female thread one end, 49 mm male thread other end.
http://camerapix.co.uk/index.php?id_pro ... er=product

Ichthyophthirius · Post by **Ichthyophthirius** » Sat Dec 15, 2018 4:56 pm

Hi,

Yes, that sounds good (in principle). But I can't tell what length of spacer you'll need (could be less than 8 mm, could be more than 12). You'll have to determine that yourself.

Good luck with the adaptation!

Pau · Post by **Pau** » Sun Dec 16, 2018 2:28 am

PeterArmitage wrote:4. STELLARVUE 8 MM - 12 MM VARIABLE LENGTH M42 EXTENSION TUB.
42 mm female thread one side, 42 mm male thread other end.
https://optcorp.com/products/stellarvue ... -sfe-m42-v

5. Step up ring. This takes me up to 49 mm to mate to camera.
Need 42 mm female thread one end, 49 mm male thread other end.
http://camerapix.co.uk/index.php?id_pro ... er=product

4. be sure that it is M42X0.75 (T or T2 mount) Being from a telescope store likely it is but it also could be the other M42 standard M42X1 "Pentax thread", widespread old camera lens mount that will not match

5. At the site it says: "This enables to use 49mm filters on lenses with 42mm thread". It is the wrong adapter, you need the opposite like the one formerly linked by Ichty "This enables to use 42mm filters on lenses with 49mm" thread: M42X0.75 female to M49X075 male
Lots of them at ebay at lower prices