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T2 Adapter - chipped or not?

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Phil Wood View Drop Down
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Topic: T2 Adapter - chipped or not?
    Posted: 29 July 2019 at 00:20
I have just won a Peleng 8mm fisheye on ebay - it comes with an M42 to MAF adapter - so I shall be able to use it as and when it arrives. However, I believe this is a T-mount lens, if so I plan to use a T2 adapter longer term. Ebay has loads, some being chipped. I doubt that any cheap chip will have an 8mm setting so I am wondering if a chipped adapter is worth bothering with? Bodies are A58, A77 & A900 - I think they can all can cope with an unchipped lens.

...

Okay - Jame Lao sells a chip that can have FLs of the buyer's choice, including 8mm - at a price - and M42 not T2. Is loss of infinity focus an issue at 8mm?



 



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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 29 July 2019 at 15:02
Yes, all those cameras will cope with an unchipped lens if you set the camera to 'release without lens' in the menu.

Why do you think you might lose infinity focus?
T mount (T2) thread looks similar to M42 but the pitch is different, so they're not interchangeable. T mount lenses are designed to be used with a T-to-whatever adaptor so if you have the right adaptor for your camera you should get infinity.

A lot of cheap chinese adaptors now go straight from T2 to MAF/whatever and this might be what you have (if it is around 10mm thick!). If not (ie, very thin), then you need T mount to M42 which is cheap and easy.

James' adaptors are useful if you want to record the FL or want IBIS, but those aren't going to be very important at 8mm.
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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Phil Wood View Drop Down
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 29 July 2019 at 23:32
The lens hasn't arrived yet, but it seems that it will come with T2/M42 adapter and a M42/MAF adapter. Which seems a bit daft.

M42 to MAF adapters are known to give problems with infinity focus if they aren't thin enough - which is one good reason to go the T2 route. My experience of M42/MAF adapters is that they tend to start unscrewing when I am trying to dismount the lens - T2 adapters are fixed to the lens - another good reason to go T2. So I would prefer to use a T2/MAF adapter and wondered if it was worth getting a chipped one. I guess not.

I already have unchipped T2/MAF and M42/MAF adapters on other lenses.


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nandbytes View Drop Down
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2019 at 06:38
I have got a t-mount to a-mount adapter (unchipped) which is going unused. Would be happy to sell it to you for very little. Let me know if you are interested
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Post Options Post Options   Quote alpha_in_exile Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2019 at 21:13
I have an Adaptall lens (not quite same as T2) that came with an M42 mount. These lenses have interchangeable mounts. Likewise, I don't think you have 2 adapters, I think you will be receiving a Peleng with an M42 mount, with an M42->MAF adapter. Mine is Adaptall-2 M42 mount with an MAF adapter.

If your M42 adapters are coming unscrewed, they might not be on tight enough. In my case, I leave the adapter on all the time, so I tighten it down quite well, knowing that I have no reason to take it off anytime soon. I know a number of photographers just buy M42->MAF adapters for each lens, so they don't have to swap the adapter around each time they pull out another M42-mount lens. With T2 and Adaptall, etc., you can just swap the whole mount (with the M42 adapter still attached), so again, you can tighten it down without worrying you won't be able to get it off.
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 31 July 2019 at 15:37
I had a significant issue on black-painted M42-MAF adaptors because they repeatedly got stuck on camera. The friction between the adaptor and the camera was much greater than that between the adaptor and the M42 thread. I had to sand off the black face to cure that.
Where I don't need a chipped adaptor, I prefer to go straight to MAF and not via M42.
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
 



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Phil Wood View Drop Down
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 31 July 2019 at 21:51
Originally posted by nandbytes nandbytes wrote:

I have got a t-mount to a-mount adapter (unchipped) which is going unused. Would be happy to sell it to you for very little. Let me know if you are interested


Thanks for the offer, I shall await arrival of the lens and do some testing before I decide what to do. I am tempted by a chipped adapter (cheap 50mm/f1.7) to see if it improves IBIS with my 135mm T2 lens. The unchipped adapter from that can go on the 8mm.

Originally posted by alpha_in_exile alpha_in_exile wrote:

I have an Adaptall lens (not quite same as T2) that came with an M42 mount. These lenses have interchangeable mounts. Likewise, I don't think you have 2 adapters, I think you will be receiving a Peleng with an M42 mount, with an M42->MAF adapter. Mine is Adaptall-2 M42 mount with an MAF adapter.


Photos on ebay show what looks like T2/M42 & M42/MAF (there is also a M42/MFT included), if it's Adaptall I shall adapt! Either way I want one adapter, not two. I think I have a Adaptall MAF mount in the drawer somewhere.



Originally posted by alpha_in_exile alpha_in_exile wrote:

If your M42 adapters are coming unscrewed, they might not be on tight enough. In my case, I leave the adapter on all the time, so I tighten it down quite well, knowing that I have no reason to take it off anytime soon. I know a number of photographers just buy M42->MAF adapters for each lens, so they don't have to swap the adapter around each time they pull out another M42-mount lens. With T2 and Adaptall, etc., you can just swap the whole mount (with the M42 adapter still attached), so again, you can tighten it down without worrying you won't be able to get it off.


I buy an adapter for each lens, but I only have two! I have been tempted to use loctite.

Originally posted by Miranda F Miranda F wrote:

I had a significant issue on black-painted M42-MAF adaptors because they repeatedly got stuck on camera. The friction between the adaptor and the camera was much greater than that between the adaptor and the M42 thread. I had to sand off the black face to cure that.
Where I don't need a chipped adaptor, I prefer to go straight to MAF and not via M42.


Just my issue with M42/MAF adapters - I shall try a little sanding.

Thanks All.

Edited by Phil Wood - 31 July 2019 at 22:11
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Post Options Post Options   Quote momech Quote  Post ReplyReply Direct Link To This Post Posted: 31 July 2019 at 23:01
I bought a Peleng years ago and it came with the same set up you're describing - T2 to M42 and M42 to MAF. Works fine. No problem with infinity focus. Don't think it's anything special with the adapters. It's an 8mm fisheye; stop it down a bit and the entire universe is in focus
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Phil Wood View Drop Down
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 01 August 2019 at 20:31
The lens has arrived - T2/M42 & M42/MAF as anticipated.

This is my first experience of a fisheye - so far it is definitely not a lens for pixel peeping, everything may be in focus, but nothing is what I'd call sharp. Point it anywhere close to sunwards and it flares as if it was designed especially to do so. But, looking at the overall image, it really doesn't seem to matter. I have a lot to learn about fisheye use!



A900, f5.6, ISO 100, 1/640th

Edited by Phil Wood - 03 August 2019 at 12:37
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 02 August 2019 at 13:52
Never had a true fisheye lens but I've tried a lot of fisheye adaptor-lens combinations. Some of them were sharp in the centre, all of them had horrible CA at the edges, and most of them had a horrid transition from the near-normal area to the badly-bent area at the edges.

You pic shows a lot of CA at the edges as well as the obvious flare, but the transition doesn't look too bad.
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2019 at 11:11
Still learning!

Apparently a standard T2/MAF adapter will not work on the Peleng - see Pete Ganzel on the subject. Not having a lathe I shall stick with the two adapters that came with the lens.

Edited by Phil Wood - 03 August 2019 at 12:37
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2019 at 11:55
Originally posted by Miranda F Miranda F wrote:

Never had a true fisheye lens but I've tried a lot of fisheye adaptor-lens combinations. Some of them were sharp in the centre, all of them had horrible CA at the edges, and most of them had a horrid transition from the near-normal area to the badly-bent area at the edges.

You pic shows a lot of CA at the edges as well as the obvious flare, but the transition doesn't look too bad.


Hoping for some sun today, so far I have been happy with everything but sharpness, reading others' experiences with Pelengs it seems that I need to stop down more (to f11 or 16) to get sharp images.

CA is not unexpected, nor is flare. The flarey blotch at 4 o'clock is said to be a reflection from a bright ring just inside the back element (now wondering if it comes apart easily for a matt black paint job). The transition is indeed pretty good.

I did try a wide angle supplementary lens a few years back, which was pretty horrible and put me off fisheye adapters - then this lens came along on ebay and I got it for £53. Seemed like a good price for a FF 8mm, it's certainly a lot better than that supplementary WA.
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2019 at 12:30
Another shot, this time on APS (A58), f16, ISO 1600, 1/160th.

Noisy, but a lot sharper.

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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2019 at 12:43
Originally posted by Phil Wood Phil Wood wrote:

Still learning!

Apparently a standard T2/MAF adapter will not work on the Peleng - see Pete Ganzel on the subject. Not having a lathe I shall stick with the two adapters that came with the lens.


yes I seem to remember Richard (Ricardovaste) finding this out many years ago - the adapter that the Peling screws into it the same thread but the distances are not right for infinity focus.

I have a James Lao m42 adapter for my Zenitar, works very well. At the time I got it (well over 10 years) they set it for 16mm fl and both maximum and minimum aperture of f/5.6 (otherwise the camera can end up thinking that it can close down the lens, leading to over-exposed shots). If I was ordering one now I'd also check to see if they could have it so that the chip records that the lens is MF only - otherwise you can end up with some cameras whirring to try and focus (a bit of a pain with my a99).
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