# Objective lens 20/0.40, 160/0 for new Delta Stage

**URL:** <https://openflexure.discourse.group/t/objective-lens-20-0-40-160-0-for-new-delta-stage/437>\
**Category:** Request Help\
**Created:** [27 February 2021 16:50 UTC](https://openflexure.discourse.group/t/objective-lens-20-0-40-160-0-for-new-delta-stage/437 "2021-02-27T16:50:12Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![ronbot](https://avatars.discourse-cdn.com/v4/letter/r/c67d28/32.png) [@ronbot](https://openflexure.discourse.group/u/ronbot)\
**Post date:** [27 February 2021 16:50 UTC](https://openflexure.discourse.group/t/objective-lens-20-0-40-160-0-for-new-delta-stage/437/1 "2021-02-27T16:50:12Z")

</div>

I was able to score some 20/0.40, 160/0 objective lenses from some old equipment at work. I was wondering if this would work for both the transmission and reflection illumination on the delta stage.

I’m not sure about the transmission illumination path when viewer samples on a cover slip. Is this going to cause any issues?

---

<div class="post-metadata">

**Author:** ![WilliamW](https://yyz2.discourse-cdn.com/free1/user_avatar/openflexure.discourse.group/williamw/32/106_2.png) [@WilliamW](https://openflexure.discourse.group/u/WilliamW)\
**Post date:** [27 February 2021 21:36 UTC](https://openflexure.discourse.group/t/objective-lens-20-0-40-160-0-for-new-delta-stage/437/2 "2021-02-27T21:36:41Z")

</div>

They should be fine. Do you know whether they are 45mm parfocal?

At 20x a coverslip does not make much difference. That would be the same for transmission or reflection.

---

<div class="post-metadata">

**Author:** ![ronbot](https://avatars.discourse-cdn.com/v4/letter/r/c67d28/32.png) [@ronbot](https://openflexure.discourse.group/u/ronbot)\
**Post date:** [27 February 2021 22:53 UTC](https://openflexure.discourse.group/t/objective-lens-20-0-40-160-0-for-new-delta-stage/437/3 "2021-02-27T22:53:37Z")

</div>

No I do not, they are completely non-descriptive and I don’t have any documentation from the original equipment it came from. Is there a way to tell without checking with zooming in and out? At the moment I don’t have any detector yet, and all similar equipment at work is static, so can’t change the magnification.

The objectives came out of scopes to inspect the end face of fiber optic connectors.

Ow, and thanks for answering my question!

---

<div class="post-metadata">

**Author:** ![WilliamW](https://yyz2.discourse-cdn.com/free1/user_avatar/openflexure.discourse.group/williamw/32/106_2.png) [@WilliamW](https://openflexure.discourse.group/u/WilliamW)\
**Post date:** [28 February 2021 22:40 UTC](https://openflexure.discourse.group/t/objective-lens-20-0-40-160-0-for-new-delta-stage/437/4 "2021-02-28T22:40:15Z")

</div>

The parfical distance will show up when you are positioning the lens to get focus on the slide. Most common ones should work (35 or 45mm), if it is longer or shorter the slot in the z-axis may not give enough adjustment to get focus at the slide. You will know as soon as you have a camera connected.

---

<div class="post-metadata">

**Author:** ![ronbot](https://avatars.discourse-cdn.com/v4/letter/r/c67d28/32.png) [@ronbot](https://openflexure.discourse.group/u/ronbot)\
**Post date:** [28 February 2021 22:58 UTC](https://openflexure.discourse.group/t/objective-lens-20-0-40-160-0-for-new-delta-stage/437/5 "2021-02-28T22:58:12Z")

</div>

Ok! I’ll come back if I have any issues. Still waiting for most of the electronic parts to come in.